Contents

Introduction

Prerequisites

Requirements

Components Used

Background Information

Configure

Network Diagram

Task 1. Configure Static NAT on FTD

Task 2. Configure Port Address Translation (PAT) on FTD

Task 3. Configure NAT Exemption on FTD

Task 4. Configure Object NAT on FTD

Task 5. Configure PAT Pool on FTD

Verify

Troubleshoot

Related Information

Introduction

This document describes how to configure and verify basic Network Address Translation (NAT) on Firepower Threat Defense (FTD).

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions:

- ASA5506X that runs FTD code 6.1.0-226

- FireSIGHT Management Center (FMC) that runs 6.1.0-226

- 3 Windows 7 hosts

- Cisco IOS® 3925 router that runs LAN-to-LAN (L2L) VPN

Lab completion time: 1 hour

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Background Information

FTD supports the same NAT configuration options as the classic Adaptive Security Appliance (ASA):

- NAT Rules Before – This is equivalent to Twice NAT (section 1) on classic ASA.

- Auto NAT Rules – Section 2 on classic ASA

- NAT Rules After – This is equivalent to Twice NAT (section 3) on classic ASA.

Since FTD configuration is done from the FMC when it comes to NAT configuration, it is necessary to be familiar with the FMC GUI and the various configuration options.

Configure

Network Diagram

Task 1. Configure Static NAT on FTD

Configure NAT as per these requirements:

NAT Policy Name

Name of the FTD device

NAT Rule

Manual NAT Rule

NAT Type

Static

Insert

In Section 1

Source interface

inside*

Destination interface

dmz*

Original Source

192.168.75.14

Translated Source

192.168.76.100

*Use Security Zones for the NAT Rule

Static NAT

Solution:

While on classic ASA, you have to use nameif in the NAT rules. On FTD, you need to use either Security Zones or Interface Groups.

Step 1. Assign interfaces to Security Zones/Interface Groups.

In this task, it is decided to assign the FTD interfaces that is used for NAT to Security Zones. Alternatively, you can assign them to Interface Groups as shown in the image.

Step 2. The result is as shown in the image.

Step 3. You can create/edit Interface Groups and Security Zones from the Objects > Object Management page as shown in the image.

Security Zones vs Interface Groups

The main difference between Security Zones and Interface Groups is that an interface can belong to only one Security Zone, but can belong to multiple Interface Groups. So practically, the Interface Groups provide more flexibility.

You can see that interface inside belongs to two different Interface Groups, but only one Security Zone as shown in the image.

Step 4. Configure Static NAT on FTD.

Navigate to Devices > NAT and create a NAT Policy. Select New Policy > Threat Defense NAT as shown in the image.

Step 5. Specify the policy name and assign it to a target device as shown in the image.

Step 6. Add a NAT Rule to the policy, click Add Rule.

Specify these as per task requirements as shown in the images.

Host-A = 192.168.75.14

Host-B = 192.168.76.100

firepower# show run object

object network Host-A

host 192.168.75.14

object network Host-B

host 192.168.76.100

Warning: If you configure Static NAT and specify an Interface as Translated Source, then all traffic destined to the IP address of the interface is being redirected. Users cannot access any service enabled on the mapped interface. Examples of such services include routing protocols like OSPF and EIGRP.

Step 7. The result is as shown in the image.

Step 8. Ensure that there is an Access Control Policy that allows Host-B to access Host-A and vice versa. Remember that Static NAT is bidirectional by default. Similar to classic ASA's, see the usage of real IPs.This is expected since in this lab, LINA runs 9.6.1.x code as shown in the image.

Verification:

From LINA CLI:

firepower# show run nat

nat (inside,dmz) source static Host-A Host-B

The NAT rule was inserted in Section 1 as expected:

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (dmz) source static Host-A Host-B

translate_hits = 0, untranslate_hits = 0

Note: The 2 xlates that are created in the background.

firepower# show xlate

2 in use, 4 most used

Flags: D - DNS, e - extended, I - identity, i - dynamic, r - portmap,

s - static, T - twice, N - net-to-net

NAT from inside:192.168.75.14 to dmz:192.168.76.100

flags sT idle 0:41:49 timeout 0:00:00

NAT from dmz:0.0.0.0/0 to inside:0.0.0.0/0

flags sIT idle 0:41:49 timeout 0:00:00

The ASP NAT tables:

firepower# show asp table classify domain nat

Input Table

in  id=0x7ff6036a9f50, priority=6, domain=nat, deny=false

hits=0, user_data=0x7ff60314dbf0, cs_id=0x0, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

in  id=0x7ff603696860, priority=6, domain=nat, deny=false

hits=0, user_data=0x7ff602be3f80, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.76.100, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

Output Table:

L2 - Output Table:

L2 - Input Table:

Last clearing of hits counters: Never

firepower# show asp table classify domain nat-reverse

Input Table

Output Table:

out id=0x7ff603685350, priority=6, domain=nat-reverse, deny=false

hits=0, user_data=0x7ff60314dbf0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

out id=0x7ff603638470, priority=6, domain=nat-reverse, deny=false

hits=0, user_data=0x7ff602be3f80, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

L2 - Output Table:

L2 - Input Table:

Last clearing of hits counters: Never

Enable capture with trace detail on FTD and ping from Host-B to Host-A and as shown in the image.

firepower# capture DMZ interface dmz trace detail match ip host 192.168.76.14 host 192.168.76.100

firepower# capture INSIDE interface inside trace detail match ip host 192.168.76.14 host 192.168.75.14

The hit counts is in the ASP tables:

firepower# show asp table classify domain nat

Input Table

in  id=0x7ff6036a9f50, priority=6, domain=nat, deny=false

hits=0, user_data=0x7ff60314dbf0, cs_id=0x0, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

in  id=0x7ff603696860, priority=6, domain=nat, deny=false

hits=4, user_data=0x7ff602be3f80, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.76.100, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

firepower# show asp table classify domain nat-reverse

Input Table

Output Table:

out id=0x7ff603685350, priority=6, domain=nat-reverse, deny=false

hits=4, user_data=0x7ff60314dbf0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

out id=0x7ff603638470, priority=6, domain=nat-reverse, deny=false

hits=0, user_data=0x7ff602be3f80, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

The packet capture shows:

firepower# show capture DMZ

8 packets captured

1: 17:38:26.324812       192.168.76.14 > 192.168.76.100: icmp: echo request

2: 17:38:26.326505       192.168.76.100 > 192.168.76.14: icmp: echo reply

3: 17:38:27.317991       192.168.76.14 > 192.168.76.100: icmp: echo request

4: 17:38:27.319456       192.168.76.100 > 192.168.76.14: icmp: echo reply

5: 17:38:28.316344       192.168.76.14 > 192.168.76.100: icmp: echo request

6: 17:38:28.317824       192.168.76.100 > 192.168.76.14: icmp: echo reply

7: 17:38:29.330518       192.168.76.14 > 192.168.76.100: icmp: echo request

8: 17:38:29.331983       192.168.76.100 > 192.168.76.14: icmp: echo reply

8 packets shown

Traces of a packet (important points are highlighted).

Note: The ID of the NAT rule and its correlation with the ASP table.

firepower# show capture DMZ packet-number 3 trace detail

8 packets captured

3: 17:38:27.317991 000c.2998.3fec d8b1.90b7.32e0 0x0800 Length: 74

192.168.76.14 > 192.168.76.100: icmp: echo request (ttl 128, id 9975)

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff602c72be0, priority=13, domain=capture, deny=false

hits=55, user_data=0x7ff602b74a50, cs_id=0x0, l3_type=0x0

src mac=0000.0000.0000, mask=0000.0000.0000

dst mac=0000.0000.0000, mask=0000.0000.0000

input_ifc=dmz, output_ifc=any

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff603612200, priority=1, domain=permit, deny=false

hits=1, user_data=0x0, cs_id=0x0, l3_type=0x8

src mac=0000.0000.0000, mask=0000.0000.0000

dst mac=0000.0000.0000, mask=0100.0000.0000

input_ifc=dmz, output_ifc=any

Phase: 3

Type: UN-NAT

Subtype: static

Result: ALLOW

Config:

nat (inside,dmz) source static Host-A Host-B

Additional Information:

NAT divert to egress interface inside

Untranslate 192.168.76.100/0 to 192.168.75.14/0

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip host 192.168.76.14 host 192.168.75.14 rule-id 268434440

access-list CSM_FW_ACL_ remark rule-id 268434440: ACCESS POLICY: FTD5506-1 - Mandatory/2

access-list CSM_FW_ACL_ remark rule-id 268434440: L4 RULE: Host-B to Host-A

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Forward Flow based lookup yields rule:

in  id=0x7ff602b72610, priority=12, domain=permit, deny=false

hits=1, user_data=0x7ff5fa9d0180, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.76.14, mask=255.255.255.255, port=0, tag=any, ifc=any

dst ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any, ifc=any, vlan=0, dscp=0x0

input_ifc=any, output_ifc=any

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff60367cf80, priority=7, domain=conn-set, deny=false

hits=1, user_data=0x7ff603677080, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=any

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,dmz) source static Host-A Host-B

Additional Information:

Static translate 192.168.76.14/1 to 192.168.76.14/1

Forward Flow based lookup yields rule:

in  id=0x7ff603696860, priority=6, domain=nat, deny=false

hits=1, user_data=0x7ff602be3f80, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.76.100, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff602220020, priority=0, domain=nat-per-session, deny=true

hits=2, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=any, output_ifc=any

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff6035c0af0, priority=0, domain=inspect-ip-options, deny=true

hits=1, user_data=0x0, cs_id=0x0, reverse, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=any

Phase: 9

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

class-map inspection_default

match default-inspection-traffic

policy-map global_policy

class inspection_default

inspect icmp

service-policy global_policy global

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff602b5f020, priority=70, domain=inspect-icmp, deny=false

hits=2, user_data=0x7ff602be7460, cs_id=0x0, use_real_addr, flags=0x0, protocol=1

src ip/id=0.0.0.0, mask=0.0.0.0, icmp-type=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, icmp-code=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=any

Phase: 10

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in  id=0x7ff602b3a6d0, priority=70, domain=inspect-icmp-error, deny=false

hits=2, user_data=0x7ff603672ec0, cs_id=0x0, use_real_addr, flags=0x0, protocol=1

src ip/id=0.0.0.0, mask=0.0.0.0, icmp-type=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, icmp-code=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=any

Phase: 11

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,dmz) source static Host-A Host-B

Additional Information:

Forward Flow based lookup yields rule:

out id=0x7ff603685350, priority=6, domain=nat-reverse, deny=false

hits=2, user_data=0x7ff60314dbf0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

Phase: 12

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Reverse Flow based lookup yields rule:

in  id=0x7ff602220020, priority=0, domain=nat-per-session, deny=true

hits=4, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=any, output_ifc=any

Phase: 13

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Reverse Flow based lookup yields rule:

in  id=0x7ff602c56d10, priority=0, domain=inspect-ip-options, deny=true

hits=2, user_data=0x0, cs_id=0x0, reverse, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 14

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 5084, packet dispatched to next module

Module information for forward flow ...

snp_fp_inspect_ip_options

snp_fp_snort

snp_fp_inspect_icmp

snp_fp_translate

snp_fp_adjacency

snp_fp_fragment

snp_ifc_stat

Module information for reverse flow ...

snp_fp_inspect_ip_options

snp_fp_translate

snp_fp_inspect_icmp

snp_fp_snort

snp_fp_adjacency

snp_fp_fragment

snp_ifc_stat

Phase: 15

Type: EXTERNAL-INSPECT

Subtype:

Result: ALLOW

Config:

Additional Information:

Application: 'SNORT Inspect'

Phase: 16

Type: SNORT

Subtype:

Result: ALLOW

Config:

Additional Information:

Snort Verdict: (pass-packet) allow this packet

Phase: 17

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.75.14 using egress ifc  inside

Phase: 18

Type: ADJACENCY-LOOKUP

Subtype: next-hop and adjacency

Result: ALLOW

Config:

Additional Information:

adjacency Active

next-hop mac address 000c.2930.2b78 hits 140694538708414

Phase: 19

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

out id=0x7ff6036a94e0, priority=13, domain=capture, deny=false

hits=14, user_data=0x7ff6024aff90, cs_id=0x0, l3_type=0x0

src mac=0000.0000.0000, mask=0000.0000.0000

dst mac=0000.0000.0000, mask=0000.0000.0000

input_ifc=inside, output_ifc=any

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: inside

output-status: up

output-line-status: up

Action: allow

1 packet shown

Task 2. Configure Port Address Translation (PAT) on FTD

Configure NAT as per these requirements:

NAT Rule

Manual NAT Rule

NAT Type

Dynamic

Insert

In Section 1

Source interface

inside*

Destination interface

outside*

Original Source

192.168.75.0/24

Translated Source

Outside interface (PAT)

*Use Security Zones for the NAT Rule

Static NAT

PAT

Solution:

Step 1. Add a second NAT Rule and configure as per the task requirements as shown in the image.

Step 2. Here is how PAT is configured as shown in the image.

Step 3. The result is as shown in the image.

Step 4. For the rest of this lab, configure the Access Control Policy to allow all the traffic to go through.

Verification:

NAT configuration:

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

2 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 0, untranslate_hits = 0

From LINA CLI note the new entry:

firepower# show xlate

3 in use, 19 most used

Flags: D - DNS, e - extended, I - identity, i - dynamic, r - portmap,

s - static, T - twice, N - net-to-net

NAT from inside:192.168.75.14 to dmz:192.168.76.100

flags sT idle 1:15:14 timeout 0:00:00

NAT from dmz:0.0.0.0/0 to inside:0.0.0.0/0

flags sIT idle 1:15:14 timeout 0:00:00

NAT from outside:0.0.0.0/0 to inside:0.0.0.0/0

flags sIT idle 0:04:02 timeout 0:00:00

Enable capture on inside and outside interface. On inside capture enable trace:

firepower# capture CAPI trace interface inside match ip host 192.168.75.14 host 192.168.77.1

firepower# capture CAPO interface outside match ip any host 192.168.77.1

Ping from Host-A (192.168.75.14) to IP 192.168.77.1 as shown in the image.

In LINA captures, you can see the PAT translation:

firepower# show cap CAPI

8 packets captured

1: 18:54:43.658001       192.168.75.14 > 192.168.77.1: icmp: echo request

2: 18:54:43.659099       192.168.77.1 > 192.168.75.14: icmp: echo reply

3: 18:54:44.668544       192.168.75.14 > 192.168.77.1: icmp: echo request

4: 18:54:44.669505       192.168.77.1 > 192.168.75.14: icmp: echo reply

5: 18:54:45.682368       192.168.75.14 > 192.168.77.1: icmp: echo request

6: 18:54:45.683421       192.168.77.1 > 192.168.75.14: icmp: echo reply

7: 18:54:46.696436       192.168.75.14 > 192.168.77.1: icmp: echo request

8: 18:54:46.697412       192.168.77.1 > 192.168.75.14: icmp: echo reply

firepower# show cap CAPO

8 packets captured

1: 18:54:43.658672       192.168.77.6 > 192.168.77.1: icmp: echo request

2: 18:54:43.658962       192.168.77.1 > 192.168.77.6: icmp: echo reply

3: 18:54:44.669109       192.168.77.6 > 192.168.77.1: icmp: echo request

4: 18:54:44.669337       192.168.77.1 > 192.168.77.6: icmp: echo reply

5: 18:54:45.682932       192.168.77.6 > 192.168.77.1: icmp: echo request

6: 18:54:45.683207       192.168.77.1 > 192.168.77.6: icmp: echo reply

7: 18:54:46.697031       192.168.77.6 > 192.168.77.1: icmp: echo request

8: 18:54:46.697275       192.168.77.1 > 192.168.77.6: icmp: echo reply

Traces of a packet with important sections highlighted:

firepower# show cap CAPI packet-number 1 trace

8 packets captured

1: 18:54:43.658001       192.168.75.14 > 192.168.77.1: icmp: echo request

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.77.1 using egress ifc  outside

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

Additional Information:

Dynamic translate 192.168.75.14/1 to 192.168.77.6/1

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

class-map inspection_default

match default-inspection-traffic

policy-map global_policy

class inspection_default

inspect icmp

service-policy global_policy global

Additional Information:

Phase: 10

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

Additional Information:

Phase: 11

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

Additional Information:

Phase: 12

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 13

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 14

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 6981, packet dispatched to next module

Phase: 15

Type: EXTERNAL-INSPECT

Subtype:

Result: ALLOW

Config:

Additional Information:

Application: 'SNORT Inspect'

Phase: 16

Type: SNORT

Subtype:

Result: ALLOW

Config:

Additional Information:

Snort Verdict: (pass-packet) allow this packet

Phase: 17

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.77.1 using egress ifc  outside

Phase: 18

Type: ADJACENCY-LOOKUP

Subtype: next-hop and adjacency

Result: ALLOW

Config:

Additional Information:

adjacency Active

next-hop mac address c84c.758d.4980 hits 140694538709114

Phase: 19

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Result:

input-interface: outside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: allow

1 packet shown

The dynamic xlate was created (note the ri flags):

firepower# show xlate

4 in use, 19 most used

Flags: D - DNS, e - extended, I - identity, i - dynamic, r - portmap,

s - static, T - twice, N - net-to-net

NAT from inside:192.168.75.14 to dmz:192.168.76.100

flags sT idle 1:16:47 timeout 0:00:00

NAT from dmz:0.0.0.0/0 to inside:0.0.0.0/0

flags sIT idle 1:16:47 timeout 0:00:00

NAT from outside:0.0.0.0/0 to inside:0.0.0.0/0

flags sIT idle 0:05:35 timeout 0:00:00

ICMP PAT from inside:192.168.75.14/1 to outside:192.168.77.6/1 flags ri idle 0:00:30 timeout 0:00:30

In the LINA logs you see:

firepower# show log

May 31 2016 18:54:43: %ASA-7-609001: Built local-host inside:192.168.75.14

May 31 2016 18:54:43: %ASA-6-305011: Built dynamic ICMP translation from inside:192.168.75.14/1 to outside:192.168.77.6/1

May 31 2016 18:54:43: %ASA-7-609001: Built local-host outside:192.168.77.1

May 31 2016 18:54:43: %ASA-6-302020: Built inbound ICMP connection for faddr 192.168.75.14/1 gaddr 192.168.77.1/0 laddr 192.168.77.1/0

May 31 2016 18:54:43: %ASA-6-302021: Teardown ICMP connection for faddr 192.168.75.14/1 gaddr 192.168.77.1/0 laddr 192.168.77.1/0

May 31 2016 18:54:43: %ASA-7-609002: Teardown local-host outside:192.168.77.1 duration 0:00:00

May 31 2016 18:55:17: %ASA-6-305012: Teardown dynamic ICMP translation from inside:192.168.75.14/1 to outside:192.168.77.6/1 duration 0:00:34

NAT sections:

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

2 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 94, untranslate_hits = 138

ASP tables show:

firepower# show asp table classify domain nat

Input Table

in  id=0x7ff6036a9f50, priority=6, domain=nat, deny=false

hits=0, user_data=0x7ff60314dbf0, cs_id=0x0, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

in  id=0x7ff603696860, priority=6, domain=nat, deny=false

hits=4, user_data=0x7ff602be3f80, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.76.100, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

in  id=0x7ff602c75f00, priority=6, domain=nat, deny=false

hits=94, user_data=0x7ff6036609a0, cs_id=0x0, flags=0x0, protocol=0

src ip/id=192.168.75.0, mask=255.255.255.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=outside

in  id=0x7ff603681fb0, priority=6, domain=nat, deny=false

hits=276, user_data=0x7ff60249f370, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.77.6, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=outside, output_ifc=inside

firepower# show asp table classify domain nat-reverse

Input Table

Output Table:

out id=0x7ff603685350, priority=6, domain=nat-reverse, deny=false

hits=4, user_data=0x7ff60314dbf0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any, dscp=0x0

input_ifc=dmz, output_ifc=inside

out id=0x7ff603638470, priority=6, domain=nat-reverse, deny=false

hits=0, user_data=0x7ff602be3f80, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.75.14, mask=255.255.255.255, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=dmz

out id=0x7ff60361bda0, priority=6, domain=nat-reverse, deny=false

hits=138, user_data=0x7ff6036609a0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any

dst ip/id=192.168.75.0, mask=255.255.255.0, port=0, tag=any, dscp=0x0

input_ifc=outside, output_ifc=inside

out id=0x7ff60361c180, priority=6, domain=nat-reverse, deny=false

hits=94, user_data=0x7ff60249f370, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.75.0, mask=255.255.255.0, port=0, tag=any

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0

input_ifc=inside, output_ifc=outside

Task 3. Configure NAT Exemption on FTD

Configure NAT as per these requirements:

NAT Rule

Manual NAT Rule

NAT Type

Static

Insert

In Section 1 all existing rules

Source interface

inside*

Destination interface

outside*

Original Source

192.168.75.0/24

Translated Source

192.168.75.0/24

Original Destination

10.1.1.0/24

Translated Destination

10.1.1.0/24

*Use Security Zones for the NAT Rule

Static NAT

PAT

NAT Exemption

Solution:

Step 1. Add a third NAT Rule and configure per task requirements as shown in the image.

Step 2. Perform Route Lookup for egress interface determination.

Note: For Identity NAT Rules, like the one that you added, you can change how the egress interface is determined and use normal route lookup as shown in the image.

Verification:

firepower# show run nat

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

nat (inside,dmz) source static Host-A Host-B

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits  destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

translate_hits = 0, untranslate_hits = 0

2 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

3 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 96, untranslate_hits = 138

Run packet-tracer for non-VPN traffic sourced from inside network. The PAT rule is used as expected:

firepower# packet-tracer input inside tcp 192.168.75.14 1111 192.168.77.1 80

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.77.1 using egress ifc  outside

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

Additional Information:

Dynamic translate 192.168.75.14/1111 to 192.168.77.6/1111

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

Additional Information:

Phase: 10

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 11

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 12

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 7227, packet dispatched to next module

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: allow

Run packet-tracer for traffic that must go through the VPN tunnel (run it twice since the first try brings the VPN tunnel up).

Note: You must choose the NAT Exemption Rule.

First packet-tracer attempt:

firepower# packet-tracer input inside tcp 192.168.75.14 1111 10.1.1.1 80

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: UN-NAT

Subtype: static

Result: ALLOW

Config:

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

Additional Information:

NAT divert to egress interface outside

Untranslate 10.1.1.1/80 to 10.1.1.1/80

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

Additional Information:

Static translate 192.168.75.14/1111 to 192.168.75.14/1111

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: VPN

Subtype: encrypt

Result: DROP

Config:

Additional Information:

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: drop

Drop-reason: (acl-drop) Flow is denied by configured rule

Second packet-tracer attempt:

firepower# packet-tracer input inside tcp 192.168.75.14 1111 10.1.1.1 80

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: UN-NAT

Subtype: static

Result: ALLOW

Config:

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

Additional Information:

NAT divert to egress interface outside

Untranslate 10.1.1.1/80 to 10.1.1.1/80

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

Additional Information:

Static translate 192.168.75.14/1111 to 192.168.75.14/1111

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: VPN

Subtype: encrypt

Result: ALLOW

Config:

Additional Information:

Phase: 10

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

Additional Information:

Phase: 11

Type: VPN

Subtype: ipsec-tunnel-flow

Result: ALLOW

Config:

Additional Information:

Phase: 12

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 13

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 14

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 7226, packet dispatched to next module

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: allow

NAT hit count verification:

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits  destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

translate_hits = 9, untranslate_hits = 9

2 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

3 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 98, untranslate_hits = 138

Task 4. Configure Object NAT on FTD

Configure NAT as per these requirements:

NAT Rule

Auto NAT Rule

NAT Type

Static

Insert

In Section 2

Source interface

inside*

Destination interface

dmz*

Original Source

192.168.75.99

Translated Source

192.168.76.99

Translate DNS replies that match this rule

Enabled

*Use Security Zones for the NAT Rule

Solution:

Step 1. Configure the rule as per the task requirements as shown in the images.

Step 2. The result is as shown in the image.

Verification:

firepower# show run nat

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

nat (inside,dmz) source static Host-A Host-B

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

!

object network obj-192.168.75.99

nat (inside,dmz) static obj-192.168.76.99 dns

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits  destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

translate_hits = 9, untranslate_hits = 9

2 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

3 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 98, untranslate_hits = 138

Auto NAT Policies (Section 2)

1 (inside) to (dmz) source static obj-192.168.75.99 obj-192.168.76.99  dns

translate_hits = 0, untranslate_hits = 0

Verification with packet-tracer:

firepower# packet-tracer input inside tcp 192.168.75.99 1111 192.168.76.100 80

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.76.100 using egress ifc  dmz

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

object network obj-192.168.75.99

nat (inside,dmz) static obj-192.168.76.99 dns

Additional Information:

Static translate 192.168.75.99/1111 to 192.168.76.99/1111

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 10

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 11

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 7245, packet dispatched to next module

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: dmz

output-status: up

output-line-status: up

Action: allow

Task 5. Configure PAT Pool on FTD

Configure NAT as per these requirements:

NAT Rule

Manual NAT Rule

NAT Type

Dynamic

Insert

In Section 3

Source interface

inside*

Destination interface

dmz*

Original Source

192.168.75.0/24

Translated Source

192.168.76.20-22

Use the entire range (1-65535)

Enabled

*Use Security Zones for the NAT Rule

Solution:

Step 1. Configure the rule per task requirements as shown in the images.

Step 2. Enable Flat Port Range with Include Reserver Ports which allows the use of the entire range (1-65535) as shown in the image.

Step 3. The result is as shown in the image.

Verification:

firepower# show run nat

nat (inside,outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

nat (inside,dmz) source static Host-A Host-B

nat (inside,outside) source dynamic Net_192.168.75.0_24bits interface

!

object network obj-192.168.75.99

nat (inside,dmz) static obj-192.168.76.99 dns

!

nat (inside,dmz) after-auto source dynamic Net_192.168.75.0_24bits pat-pool range-192.168.76.20-22 flat include-reserve

The rule is in Section 3:

firepower# show nat

Manual NAT Policies (Section 1)

1 (inside) to (outside) source static Net_192.168.75.0_24bits Net_192.168.75.0_24bits  destination static net_10.1.1.0_24bits net_10.1.1.0_24bits

translate_hits = 9, untranslate_hits = 9

2 (inside) to (dmz) source static Host-A Host-B

translate_hits = 26, untranslate_hits = 26

3 (inside) to (outside) source dynamic Net_192.168.75.0_24bits interface

translate_hits = 98, untranslate_hits = 138

Auto NAT Policies (Section 2)

1 (inside) to (dmz) source static obj-192.168.75.99 obj-192.168.76.99  dns

translate_hits = 1, untranslate_hits = 0

Manual NAT Policies (Section 3)

1 (inside) to (dmz) source dynamic Net_192.168.75.0_24bits pat-pool range-192.168.76.20-22 flat include-reserve

translate_hits = 0, untranslate_hits = 0

Packet-tracer verification:

firepower# packet-tracer input inside icmp 192.168.75.15 8 0 192.168.76.5

Phase: 1

Type: CAPTURE

Subtype:

Result: ALLOW

Config:

Additional Information:

MAC Access list

Phase: 2

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

MAC Access list

Phase: 3

Type: ROUTE-LOOKUP

Subtype: Resolve Egress Interface

Result: ALLOW

Config:

Additional Information:

found next-hop 192.168.76.5 using egress ifc  dmz

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group CSM_FW_ACL_ global

access-list CSM_FW_ACL_ advanced permit ip any any rule-id 268434434

access-list CSM_FW_ACL_ remark rule-id 268434434: ACCESS POLICY: FTD5506-1 - Default/1

access-list CSM_FW_ACL_ remark rule-id 268434434: L4 RULE: DEFAULT ACTION RULE

Additional Information:

This packet will be sent to snort for additional processing where a verdict will be reached

Phase: 5

Type: CONN-SETTINGS

Subtype:

Result: ALLOW

Config:

class-map class-default

match any

policy-map global_policy

class class-default

set connection advanced-options UM_STATIC_TCP_MAP

service-policy global_policy global

Additional Information:

Phase: 6

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,dmz) after-auto source dynamic Net_192.168.75.0_24bits pat-pool range-192.168.76.20-22 flat include-reserve

Additional Information:

Dynamic translate 192.168.75.15/0 to 192.168.76.20/11654

Phase: 7

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 8

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 9

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

class-map inspection_default

match default-inspection-traffic

policy-map global_policy

class inspection_default

inspect icmp

service-policy global_policy global

Additional Information:

Phase: 10

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

Additional Information:

Phase: 11

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,dmz) after-auto source dynamic Net_192.168.75.0_24bits pat-pool range-192.168.76.20-22 flat include-reserve

Additional Information:

Phase: 12

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Phase: 13

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Phase: 14

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 7289, packet dispatched to next module

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: dmz

output-status: up

output-line-status: up

Action: allow

Verify

Use this section in order to confirm that your configuration works properly.

Verification has been explained in the individual task sections.

Troubleshoot

This section provides information you can use in order to troubleshoot your configuration.

Open the Advanced Troubleshooting page on the FMC, run the packet-tracer and then run the show nat pool command.

Note: The entry that uses the entire range as shown in the image.

Related Information

- All versions of the Cisco Firepower Management Center configuration guide can be found here:

Navigating the Cisco Secure Firewall Threat Defense Documentation

- Cisco Global Technical Assistance Center (TAC) strongly recommends this visual guide for in-depth practical knowledge on Cisco Firepower Next Generation Security Technologies, which includes the ones mentioned in this article:

Cisco Press - Firepower Threat Defense

- For all Configuration and Troubleshooting TechNotes that pertain to Firepower technologies:

Cisco Secure Firewall Management Center

- Technical Support & Documentation - Cisco Systems