Contents

Introduction

Prerequisites

Requirements

Restrictions

Components Used

Conventions

Background Information

Configure

Network Diagram

Full Tunnel Configuration

ASA Configuration Using Adaptive Security Device Manager (ASDM)

ASA Configuration Using CLI

Windows 8 L2TP/IPsec Client Configuration

Split Tunnel Configuration

Configuration on ASA

Configuration on L2TP/IPsec client

Verify

Troubleshoot

Related Information

Introduction

This document describes how to configure Layer 2 Tunneling Protocol (L2TP) over IPsec using pre-shared key between Cisco Adaptive Security Appliance (ASA) and Windows 8 native client.

L2TP over Internet Protocol security (IPsec) provides the capability to deploy and administer an L2TP Virtual Private Network (VPN) solution alongside the IPsec VPN and firewall services in a single platform.

Prerequisites

Requirements

Cisco recommends that you have knowledge of these topics:

- IP connectivity from the client machine to the ASA. To test connectivity, try to ping the IP address of the ASA from client endpoint and vice versa

- Ensure that UDP port 500 and 4500 and Encapsulating Security Payload (ESP) protocol is not blocked anywhere along the path of the connection

Restrictions

- L2TP over IPsec supports only IKEv1. IKEv2 is not supported.

- L2TP with IPsec on the ASA allows the LNS to interoperate with native VPN clients integrated in such operating systems as Windows, MAC OS X, Android, and Cisco IOS. Only L2TP with IPsec is supported, native L2TP itself is not supported on ASA.

- The minimum IPsec security association lifetime supported by the Windows client is 300 seconds. If the lifetime on the ASA is set to less than 300 seconds, the Windows client ignores it and replaces it with a 300 second lifetime.

- The ASA only supports the Point-to-Point Protocol (PPP) authentications Password Authentication Protocol (PAP) and Microsoft Challenge-Handshake Authentication Protocol (CHAP), Versions 1 and 2, on the local database. Extensible Authentication Protocol (EAP) and CHAP are performed by proxy authentication servers. Therefore, if a remote user belongs to a tunnel group configured with the authentication eap-proxy or authentication chap commands, and the ASA is configured to use the local database, that user cannot connect.

Supported PPP Authentication Types

L2TP over IPsec connections on the ASA support only the PPP authentication types shown in Table

AAA Server Support and PPP Authentication Types

AAA Server Type

Supported PPP Authentication Types

LOCAL

PAP, MSCHAPv1, MSCHAPv2

RADIUS

PAP, CHAP, MSCHAPv1, MSCHAPv2, EAP-Proxy

TACACS+

PAP, CHAP, MSCHAPv1

LDAP

PAP

NT

PAP

Kerberos

PAP

SDI

SDI

PPP Authentication Type Characteristics

Keyword

Authentication Type

Characteristics

chap

CHAP

In response to the server challenge, the client returns the encrypted [challenge plus password] with a clear text username. This protocol is more secure than the PAP, but it does not encrypt data.

eap-proxy

EAP

Enables EAP which permits the security appliance to proxy the PPP authentication process to an external RADIUS authentication server.

ms-chap-v1

ms-chap-v2

Microsoft CHAP, Version 1

Microsoft CHAP, Version, 2

Similar to CHAP but more secure in that the server stores and compares only encrypted passwords rather than clear text passwords as in CHAP. This protocol also generates a key for data encryption by MPPE.

pap

PAP

Passes clear text username and password during authentication and is not secure.

Components Used

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

- Cisco 5515 Series ASA that runs the software version 9.4(1)

- L2TP/IPSec client (Windows 8)

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.

Related Products

This configuration can also be used with Cisco ASA 5500 series Security Appliance 8.3(1) or later.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions

Background Information

Layer 2 Tunneling Protocol (L2TP) is a VPN tunneling protocol that allows remote clients to use the public IP network to securely communicate with private corporate network servers. L2TP uses PPP over UDP (port 1701) to tunnel the data.

L2TP protocol is based on the client/server model. The function is divided between the L2TP Network Server (LNS), and the L2TP Access Concentrator (LAC). The LNS typically runs on a network gateway such as the ASA in this case, while the LAC can be a dial-up Network Access Server (NAS) or an endpoint device with a bundled L2TP client such as Microsoft Windows, Apple iPhone, or Android.

Configure

This section is presented with the information to configure the features described in this document.

Note: Use the Command Lookup Tool (registered customers only) to find more information on the commands used in this document.

Note: The IP addressing schemes used in this configuration are not legally routable on the Internet. They are RFC 1918 addresses that have been used in a lab environment.

Network Diagram

Full Tunnel Configuration

ASA Configuration Using Adaptive Security Device Manager (ASDM)

Complete these steps:

Step 1. Log in to the ASDM, and navigate to Wizards > VPN Wizards > Ipsec (IKEv1) Remote Access VPN Wizard.

Step 2. A Remote Access VPN setup window appears. From the drop-down list, choose the interface on which VPN tunnel has to be terminated. In this example outside interface is connected to WAN and so terminating VPN tunnels on this interface. Keep the box Enable inbound IPSec sessions to bypass interface access lists. Group policy and per-user authorization access lists still apply to the traffic checked so that new access-list need not to be configured on outside interface to allow the clients to access internal resources. Click Next.

Step 3. As showin in this image, choose the client type as Microsoft Windows client using L2TP over IPSec and MS-CHAP-V1 and MS-CHAP-V2 as PPP authentication protocol since PAP is not secure and other authentication types are not supported with LOCAL database as authentication server and Click Next.

Step 4. Choose the authentication method as Pre-shared-key and type the pre-shared-key which must be same on the client side as well and click Next, as shown in this image.

Step 5. Specify a method to authenticate users who attempt L2TP over IPsec connections. Either an external AAA authentication server or its own local database can be used. Choose  Authenticate using the local user database if you want to authenticate the clients against local database of ASA and Click Next.

Note: Please refer Configure RADIUS Authentication for VPN users to authenticate the users using external AAA server.

Step 6. To add new users to the local database for user authentication, enter the username and password and then click ADD or else existing user accounts in the database can be used, as shown in this image. Click Next.

Step 7. From the drop-down list, choose the address pool to be used for assigning IP address to the clients. To create new address pool, click New, as shown in this image.

Step 8. The Add IPv4 Pool dialog box appears.

1. Enter the name of the new IP address pool.

2. Enter the starting and ending IP addresses.

3. Enter the subnet mask and click OK.

Step 9. Verify the pool settings and click Next.

Step 10. Configure the attributes to be pushed to the clients or leave it empty and click Next.

Step 11: Ensure that Enable Perfect Forwarding Secrecy (PFS) box is unchecked as some client platforms do not support this feature. Enable split tunneling to let remote users have simultaneous encrypted access to the resources defined above, and unencrypted access to the internet box is unchecked which means the full tunneling is enabled in which all traffic (including internet traffic) from the client machine will be sent to the ASA over the VPN tunnel. Click Next.

Step 12. Review the summary information and then click Finish.

ASA Configuration Using CLI

Step 1. Configure IKE Phase 1 policy parameters.

This policy is used to protect control traffic between the peers (that is, it protects pre-shared key and phase 2 negotiations)

ciscoasa(config)#crypto ikev1 policy 10

ciscoasa(config-ikev1-policy)#authentication pre-share

ciscoasa(config-ikev1-policy)#encryption 3des

ciscoasa(config-ikev1-policy)#hash sha

ciscoasa(config-ikev1-policy)#group 2

ciscoasa(config-ikev1-policy)#lifetime 86400

ciscoasa(config-ikev1-policy)#exit

Step 2. Configure Transform-set.

It contains IKE Phase 2 policy parameters which are used to protect the data traffic. Since the Windows L2TP/IPsec client uses IPsec transport mode, set the mode to transport. The default is tunnel mode

ciscoasa(config)#crypto ipsec ikev1 transform-set TRANS-ESP-3DES-SHA esp-3des esp-sha-hmac

ciscoasa(config)#crypto ipsec ikev1 transform-set TRANS-ESP-3DES-SHA mode transport

Step 3. Configure dynamic map.

As windows clients get dynamic IP address fron ISP or local DHCP server (example modem), ASA is not aware about the peer IP address and this poses a problem in the configuration of a static peer on the ASA end. So dynamic crypto configuration has to be approached in which all the parameters are not necessarily defined and the missing parameters are later dynamically learned, as the result of IPSec negotiation from the client.

ciscoasa(config)#crypto dynamic-map outside_dyn_map 10 set ikev1 transform-set TRANS-ESP-3DES-SHA

Step 4. Bind dynamic map to static crypto map and apply the crypto map and enable IKEv1 on outside interface

Dynamic crypto map cannot be applied on an interface and so bind it to static crypto map. Dynamic crypto sets should be the lowest priority crypto maps in the crypto map set (that is, they should have the highest sequence numbers) so that the ASA evaluates other crypto maps first. It examines the dynamic crypto map set only when the other (static) map entries do not match.

ciscoasa(config)#crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map

ciscoasa(config)#crypto map outside_map interface outside

ciscoasa(config)#crypto ikev1 enable outside

Step 5. Create IP address pool

Create a pool of addresses from which IP addresses are assigned dynamically to the remote VPN Clients. Ignore this step to use existing pool on ASA.

ciscoasa(config)#ip local pool Address-pool 192.168.1.1-192.168.1.254 mask 255.255.255.0

Step 6. Configure group-policy

Identify the group policy as internal which means the attributes is pulled from local database.

ciscoasa(config)#group-policy L2TP-VPN internal

Note: L2TP/IPsec connections can be configured with either default group policy (DfltGrpPolicy) or a user-defined group policy. In either case, the group policy must be configured to use the L2TP/IPsec tunneling protocol. configure l2tp-ipsec on the VPN protocol attribute on the default group-policy which will get inherited to the user-defined group policy if the vpn-protocol attribute is not configured on it.

Configure the attributes such as vpn tunnel protocol (in our case, it is l2tp-ipsec), domain name, DNS and WINS server IP address and new user accounts

ciscoasa(config)#group-policy L2TP-VPN attributes

ciscoasa(config-group-policy)#dns-server value 8.8.8.8 4.4.4.2

ciscoasa(config-group-policy)#vpn-tunnel-protocol l2tp-ipsec

ciscoasa(config-group-policy)#default-domain value cisco.com

Configure usernames and passwords on the device in addition to using AAA. If the user is an L2TP client that uses Microsoft CHAP version 1 or version 2, and the ASA is configured to authenticate against the local database, mschap keyword must be included. For example, username <username> password <password> mschap.

ciscoasa(config-group-policy)# username test password test mschap

Step 7. Configure tunnel-group

Create a tunnel group with the tunnel-group command, and specify the local address pool name used to allocate the IP address to the client. If authentication method is pre-shared-key, tunnel group name must be DefaultRAGroup as there is no option on the client to specify the tunnel group and so it lands on default tunnel-group only. Bind the group policy to tunnel-group using the default-group-policy command

ciscoasa(config)#tunnel-group DefaultRAGroup general-attributes

ciscoasa(config-tunnel-general)#address-pool Address-pool

ciscoasa(config-tunnel-general)#default-group-policy L2TP-VPN

ciscoasa(config-tunnel-general)#exit

Note: The default connection profile (tunnel group), DefaultRAGroup has to be configured, if pre-shared key  based authentication is performed. If certificate-based authentication is performed, a user-defined connection profile can be chosen based on certificate identifiers

Use the tunnel-group ipsec-attributes command to enter the ipsec-attribute configuration mode in order to set the pre-shared key.

ciscoasa(config)# tunnel-group DefaultRAGroup ipsec-attributes

ciscoasa(config-tunnel-ipsec)#  ikev1 pre-shared-key C!sc0@123

ciscoasa(config-tunnel-ipsec)#exit

Configure the PPP authentication protocol with the authentication type command from tunnel group ppp-attributes mode. Disable CHAP which is enabled by default as it is not supported if AAA server is configured as local database.

ciscoasa(config)#tunnel-group DefaultRAGroup ppp-attributes

ciscoasa(config-ppp)#no authentication chap

ciscoasa(config-ppp)#authentication ms-chap-v2

ciscoasa(config-ppp)#exit

Step 8. Configure NAT-Exemption

Configure NAT-Exemption so that the clients can access internal resources connected to internal interfaces (In this example, internal resources are connected to inside interface).

ciscoasa(config)#object network L2TP-Pool

ciscoasa(config-network-object)#subnet 192.168.1.0 255.255.255.0

ciscoasa(config-network-object)#exit

ciscoasa(config)# nat (inside,outside) source static any any destination static L2TP-Pool L2TP-Pool no-proxy-arp route-lookup

Complete Sample Configuration

crypto ikev1 policy 10

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

exit

crypto ipsec ikev1 transform-set TRANS-ESP-3DES-SHA esp-3des esp-sha-hmac

crypto ipsec ikev1 transform-set TRANS-ESP-3DES-SHA mode transport

crypto dynamic-map outside_dyn_map 10 set ikev1 transform-set TRANS-ESP-3DES-SHA

crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map

crypto map outside_map interface outside

crypto ikev1 enable outside

ip local pool Address-pool 192.168.1.1-192.168.1.254 mask 255.255.255.0

group-policy L2TP-VPN internal

group-policy L2TP-VPN attributes

vpn-tunnel-protocol l2tp-ipsec

default-domain value cisco.com

username test password test mschap

exit

tunnel-group DefaultRAGroup general-attributes

address-pool Address-pool

default-group-policy L2TP-VPN

exit

tunnel-group DefaultRAGroup ipsec-attributes

ikev1 pre-shared-key C!sc0@123

exit

tunnel-group DefaultRAGroup ppp-attributes

no authentication chap

authentication ms-chap-v2

exit

object network L2TP-Pool

subnet 192.168.1.0 255.255.255.0

exit

nat(inside,outside) source static any any destination static L2TP-Pool L2TP-Pool no-proxy-arp route-lookup

Windows 8 L2TP/IPsec Client Configuration

1. Open Control panel and select Network and Sharing center.

2. Choose Set up a new connection or network option.

3. Choose Connect to a workplace option and click Next.

4.Click Use my Internet connection (VPN) option.

5. Enter IP address of ASA's WAN interface or FQDN and any name for VPN adapter which is locally significant and click Create.

6. On Network and Sharing Center, choose Change adapter settings option on the left pane of the window.

7. Right click the recently created adapterfor L2TP VPN and choose Properties.

8. Navigate to Security tab, choose the Type of VPN as Layer 2 Tunneling Protocol with IPsec (L2TP/IPsec) and then click on Advanced settings.

9. Enter the preshared key as the same mentioned in tunnel-group DefaultRAGroup and click OK. In this example, C!sc0@123 is used as the pre-shared key.

10. Choose the authentication method as Allow these protocols and ensure that only "Microsoft CHAP Version 2 (MS-CHAP v2) checkbox is checked and click OK.

11. Under network connections, right click on L2TP VPN adapter and choose Connect/Disconnect.

12. Networks icon will pop up and click Connect on L2TP VPN connection.

13. Enter the user credentials and click OK.

If the required parameters are matched on both the ends, L2TP/IPsec connection will be established.

Split Tunnel Configuration

Split tunnelling is a feature that you can use in order to define the traffic for the subnets or hosts that must be encrypted. This involves the configuration of an Access Control List (ACL) that is associated with this feature. The traffic for the subnets or hosts that is defined on this ACL gets encrypted over the tunnel from the client-end, and the routes for these subnets are installed on the PC routing table. ASA intercepts DHCPINFORM message from a client and responds with the subnet mask, domain name, and classless static routes.

Configuration on ASA

ciscoasa(config)# access-list SPLIT standard permit 10.1.1.0 255.255.255.0

ciscoasa(config)# group-policy DefaultRAGroup attributes

ciscoasa(config-group-policy)# split-tunnel-policy tunnelspecified

ciscoasa(config-group-policy)# split-tunnel-network-list value SPLIT

ciscoasa(config-group-policy)# intercept-dhcp 255.255.255.255 enable

Configuration on L2TP/IPsec client

1. Right click on the L2TP VPN adapter and choose Properties.

2. Navigate to Networking tab, choose Internet Protocol Version 4 (TCP/IPv4)  and then click on Properties.

3. Click Advanced option.

4. Uncheck Use default gateway on remote network option and click OK.

Verify

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

Note: The Output Interpreter Tool (registered customers only) supports certain show commands. Use the Output Interpreter Tool in order to view an analysis of show command output.

- show crypto ikev1 sa - Shows all current IKE SAs at a peer.

ciscoasa# show crypto ikev1 sa

IKEv1 SAs:

Active SA: 1

Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey)

Total IKE SA: 1

1   IKE Peer:

10.1.1.2

Type    : user            Role    : responder

Rekey   : no

State   : MM_ACTIVE

- show crypto ipsec sa - Shows all current IPsec SAs at a peer.

ciscoasa# show crypto ipsec sa

interface: outside

Crypto map tag:

outside_dyn_map

, seq num: 10, local addr: 172.16.1.2

local ident (addr/mask/prot/port): (172.16.1.2/255.255.255.255/

17/1701

)

remote ident (addr/mask/prot/port): (10.1.1.2/255.255.255.255/

17/1701

)

current_peer: 10.1.1.2, username: test

dynamic allocated peer ip: 192.168.1.1

dynamic allocated peer ip(ipv6): 0.0.0.0

#pkts encaps: 29, #pkts encrypt: 29, #pkts digest: 29

#pkts decaps: 118, #pkts decrypt: 118, #pkts verify: 118

#pkts compressed: 0, #pkts decompressed: 0

#pkts not compressed: 29, #pkts comp failed: 0, #pkts decomp failed: 0

#post-frag successes: 0, #post-frag failures: 0, #fragments created: 0

#PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0

#TFC rcvd: 0, #TFC sent: 0

#Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0

#send errors: 0, #recv errors: 0

local crypto endpt.: 172.16.1.2/0, remote crypto endpt.: 10.1.1.2/0

path mtu 1500, ipsec overhead 58(36), media mtu 1500

PMTU time remaining (sec): 0, DF policy: copy-df

ICMP error validation: disabled, TFC packets: disabled

current outbound spi: E8AF927A

current inbound spi : 71F346AB

inbound esp sas:

spi: 0x71F346AB (1911768747)

transform: esp-3des esp-sha-hmac no compression

in use settings ={RA, Transport, IKEv1, }

slot: 0, conn_id: 4096, crypto-map: outside_dyn_map

sa timing: remaining key lifetime (kB/sec): (237303/3541)

IV size: 8 bytes

replay detection support: Y

Anti replay bitmap:

0x00000000 0x00000003

outbound esp sas:

spi: 0xE8AF927A (3903820410)

transform: esp-3des esp-sha-hmac no compression

in use settings ={RA, Transport, IKEv1, }

slot: 0, conn_id: 4096, crypto-map: outside_dyn_map

sa timing: remaining key lifetime (kB/sec): (237303/3541)

IV size: 8 bytes

replay detection support: Y

Anti replay bitmap:

0x00000000 0x00000001

- show vpn-sessiondb detail ra-ikev1-ipsec filter protocol l2tpOverIpSec - Shows detailed information about L2TP over IPsec connections.

ciscoasa# show vpn-sessiondb detail ra-ikev1-ipsec filter protocol l2tpOverIpSec

Session Type: IKEv1 IPsec Detailed

Username     : test

Index        : 1

Assigned IP  : 192.168.1.1            Public IP    : 10.1.1.2

Protocol     : IKEv1 IPsec L2TPOverIPsec

License      : Other VPN

Encryption   : IKEv1: (1)3DES  IPsec: (1)3DES  L2TPOverIPsec: (1)none

Hashing      : IKEv1: (1)SHA1  IPsec: (1)SHA1  L2TPOverIPsec: (1)none

Bytes Tx     : 1574                   Bytes Rx     : 12752

Pkts Tx      : 29                     Pkts Rx      : 118

Pkts Tx Drop : 0                      Pkts Rx Drop : 0

Group Policy : L2TP-VPN               Tunnel Group : DefaultRAGroup

Login Time   : 23:32:48 UTC Sat May 16 2015

Duration     : 0h:04m:05s

Inactivity   : 0h:00m:00s

VLAN Mapping : N/A                    VLAN         : none

Audt Sess ID : 0a6a2577000010005557d3a0

Security Grp : none

IKEv1 Tunnels: 1

IPsec Tunnels: 1

L2TPOverIPsec Tunnels: 1

IKEv1:

Tunnel ID    : 1.1

UDP Src Port : 500                    UDP Dst Port : 500

IKE Neg Mode : Main                   Auth Mode    : preSharedKeys

Encryption   : 3DES                   Hashing      : SHA1

Rekey Int (T): 28800 Seconds          Rekey Left(T): 28555 Seconds

D/H Group    : 2

Filter Name  :

IPsec:

Tunnel ID    : 1.2

Local Addr   : 172.16.1.2/255.255.255.255/17/1701

Remote Addr  : 10.1.1.2/255.255.255.255/17/1701

Encryption   : 3DES                   Hashing      : SHA1

Encapsulation: Transport

Rekey Int (T): 3600 Seconds           Rekey Left(T): 3576 Seconds

Rekey Int (D): 250000 K-Bytes         Rekey Left(D): 250000 K-Bytes

Idle Time Out: 30 Minutes             Idle TO Left : 29 Minutes

Bytes Tx     : 1574                   Bytes Rx     : 12752

Pkts Tx      : 29                     Pkts Rx      : 118

L2TPOverIPsec:

Tunnel ID    : 1.3

Username     : test

Assigned IP  : 192.168.1.1

Public IP    : 10.1.1.2

Encryption   : none                   Hashing      : none

Auth Mode    : msCHAPV2

Idle Time Out: 30 Minutes             Idle TO Left : 27 Minutes

Client OS    : Microsoft

Client OS Ver: 6.2

Bytes Tx     : 475                    Bytes Rx     : 9093

Pkts Tx      : 18                     Pkts Rx      : 105

On ASDM, under Monitoring > VPN > VPN Statistics > Sessions the general information regarding the VPN session can be seen. L2TP over IPsec sessions can be filtered by IPsec (IKEv1) Remote Access > Protocol > L2TP Over IPsec.

Troubleshoot

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

Note: Refer to Important Information on Debug Commands before you use debug commands.

Caution: On the ASA, you can set various debug levels; by default, level 1 is used. If you change the debug level, the verbosity of the debugs might increase. Do this with caution, especially in production environments!

Use the following debug commands with caution in order to troubleshoot the problems with VPN tunnel

- debug crypto ikev1 - displays debug information about IKE

- debug crypto ipsec - displays debug information about IPsec

Here is the debug output for a successful L2TP over IPSec connection:

May 18 04:17:18 [IKEv1]IKE Receiver: Packet received on 172.16.1.2:500 from 10.1.1.2:500

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE RECEIVED Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 408

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing SA payload

May 18 04:17:18 [IKEv1]Phase 1 failure:  Mismatched attribute types for class Group Description:  Rcv'd: Unknown  Cfg'd: Group 2

May 18 04:17:18 [IKEv1]Phase 1 failure:  Mismatched attribute types for class Group Description:  Rcv'd: Unknown  Cfg'd: Group 2

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Oakley proposal is acceptable

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Received NAT-Traversal RFC VID

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Received NAT-Traversal ver 02 VID

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Received Fragmentation VID

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing IKE SA payload

May 18 04:17:18 [IKEv1]Phase 1 failure:  Mismatched attribute types for class Group Description:  Rcv'd: Unknown  Cfg'd: Group 2

May 18 04:17:18 [IKEv1]Phase 1 failure:  Mismatched attribute types for class Group Description:  Rcv'd: Unknown  Cfg'd: Group 2

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2,

IKE SA Proposal # 1, Transform # 5 acceptable  Matches global IKE entry # 2

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing ISAKMP SA payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing NAT-Traversal VID ver RFC payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing Fragmentation VID + extended capabilities payload

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE SENDING Message (msgid=0) with payloads : HDR + SA (1) + VENDOR (13) + VENDOR (13) + NONE (0) total length : 124

May 18 04:17:18 [IKEv1]IKE Receiver: Packet received on 172.16.1.2:500 from 10.1.1.2:500

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE RECEIVED Message (msgid=0) with payloads : HDR + KE (4) + NONCE (10) + NAT-D (20) + NAT-D (20) + NONE (0) total length : 260

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing ke payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing ISA_KE payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing nonce payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing NAT-Discovery payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, computing NAT Discovery hash

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, processing NAT-Discovery payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, computing NAT Discovery hash

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing ke payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing nonce payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing Cisco Unity VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing xauth V6 VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Send IOS VID

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Constructing ASA spoofing IOS Vendor ID payload (version: 1.0.0, capabilities: 20000001)

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing VID payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, Send Altiga/Cisco VPN3000/Cisco ASA GW VID

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing NAT-Discovery payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, computing NAT Discovery hash

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, constructing NAT-Discovery payload

May 18 04:17:18 [IKEv1 DEBUG]IP = 10.1.1.2, computing NAT Discovery hash

May 18 04:17:18 [IKEv1]IP = 10.1.1.2,

Connection landed on tunnel_group DefaultRAGroup

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Generating keys for Responder...

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE SENDING Message (msgid=0) with payloads : HDR + KE (4) + NONCE (10) + VENDOR (13) + VENDOR (13) + VENDOR (13) + VENDOR (13) + NAT-D (20) + NAT-D (20) + NONE (0) total length : 304

May 18 04:17:18 [IKEv1]IKE Receiver: Packet received on 172.16.1.2:500 from 10.1.1.2:500

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE RECEIVED Message (msgid=0) with payloads : HDR + ID (5) + HASH (8) + NONE (0) total length : 64

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing ID payload

May 18 04:17:18 [IKEv1 DECODE]Group = DefaultRAGroup, IP = 10.1.1.2, ID_IPV4_ADDR ID received

10.1.1.2

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing hash payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Computing hash for ISAKMP

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

Automatic NAT Detection Status:     Remote end is NOT behind a NAT device     This   end is NOT behind a NAT device

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, Connection landed on tunnel_group DefaultRAGroup

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing ID payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing hash payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Computing hash for ISAKMP

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing dpd vid payload

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE SENDING Message (msgid=0) with payloads : HDR + ID (5) + HASH (8) + VENDOR (13) + NONE (0) total length : 84

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

PHASE 1 COMPLETED

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, Keep-alive type for this connection: None

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, Keep-alives configured on but peer does not support keep-alives (type = None)

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Starting P1 rekey timer: 21600 seconds.

May 18 04:17:18 [IKEv1]IKE Receiver: Packet received on 172.16.1.2:500 from 10.1.1.2:500

May 18 04:17:18 [IKEv1 DECODE]IP = 10.1.1.2, IKE Responder starting QM: msg id = 00000001

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE RECEIVED Message (msgid=1) with payloads : HDR + HASH (8) + SA (1) + NONCE (10) + ID (5) + ID (5) + NONE (0) total length : 300

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing hash payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing SA payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing nonce payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing ID payload

May 18 04:17:18 [IKEv1 DECODE]Group = DefaultRAGroup, IP = 10.1.1.2, ID_IPV4_ADDR ID received

10.1.1.2

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

Received remote Proxy Host data in ID Payload:  Address 10.1.1.2, Protocol 17, Port 1701

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing ID payload

May 18 04:17:18 [IKEv1 DECODE]Group = DefaultRAGroup, IP = 10.1.1.2, ID_IPV4_ADDR ID received

172.16.1.2

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

Received local Proxy Host data in ID Payload:  Address 172.16.1.2, Protocol 17, Port 1701

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

L2TP/IPSec session detected.

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2, QM IsRekeyed old sa not found by addr

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

Static Crypto Map check, map outside_dyn_map, seq = 10 is a successful match

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2, IKE Remote Peer configured for crypto map: outside_dyn_map

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing IPSec SA payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, I

PSec SA Proposal # 2, Transform # 1 acceptable

Matches global IPSec SA entry # 10

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2, IKE: requesting SPI!

IPSEC: New embryonic SA created @ 0x00007fffe13ab260,

SCB: 0xE1C00540,

Direction: inbound

SPI      : 0x7AD72E0D

Session ID: 0x00001000

VPIF num  : 0x00000002

Tunnel type: ra

Protocol   : esp

Lifetime   : 240 seconds

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, IKE got SPI from key engine: SPI = 0x7ad72e0d

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, oakley constucting quick mode

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing blank hash payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing IPSec SA payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing IPSec nonce payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing proxy ID

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2,

Transmitting Proxy Id:

Remote host: 10.1.1.2  Protocol 17  Port 1701

Local host:  172.16.1.2  Protocol 17  Port 1701

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, constructing qm hash payload

May 18 04:17:18 [IKEv1 DECODE]Group = DefaultRAGroup, IP = 10.1.1.2, IKE Responder sending 2nd QM pkt: msg id = 00000001

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE SENDING Message (msgid=1) with payloads : HDR + HASH (8) + SA (1) + NONCE (10) + ID (5) + ID (5) + NONE (0) total length : 160

May 18 04:17:18 [IKEv1]IKE Receiver: Packet received on 172.16.1.2:500 from 10.1.1.2:500

May 18 04:17:18 [IKEv1]IP = 10.1.1.2, IKE_DECODE RECEIVED Message (msgid=1) with payloads : HDR + HASH (8) + NONE (0) total length : 52

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, processing hash payload

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, loading all IPSEC SAs

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Generating Quick Mode Key!

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, NP encrypt rule look up for crypto map outside_dyn_map 10 matching ACL Unknown: returned cs_id=e148a8b0; encrypt_rule=00000000; tunnelFlow_rule=00000000

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Generating Quick Mode Key!

IPSEC: New embryonic SA created @ 0x00007fffe1c75c00,

SCB: 0xE13ABD20,

Direction: outbound

SPI      : 0x8C14FD70

Session ID: 0x00001000

VPIF num  : 0x00000002

Tunnel type: ra

Protocol   : esp

Lifetime   : 240 seconds

IPSEC: Completed host OBSA update, SPI 0x8C14FD70

IPSEC: Creating outbound VPN context, SPI 0x8C14FD70

Flags: 0x00000205

SA   : 0x00007fffe1c75c00

SPI  : 0x8C14FD70

MTU  : 1500 bytes

VCID : 0x00000000

Peer : 0x00000000

SCB  : 0x0AC609F9

Channel: 0x00007fffed817200

IPSEC: Completed outbound VPN context, SPI 0x8C14FD70

VPN handle: 0x00000000000028d4

IPSEC: New outbound encrypt rule, SPI 0x8C14FD70

Src addr: 172.16.1.2

Src mask: 255.255.255.255

Dst addr: 10.1.1.2

Dst mask: 255.255.255.255

Src ports

Upper: 1701

Lower: 1701

Op   : equal

Dst ports

Upper: 1701

Lower: 1701

Op   : equal

Protocol: 17

Use protocol: true

SPI: 0x00000000

Use SPI: false

IPSEC: Completed outbound encrypt rule, SPI 0x8C14FD70

Rule ID: 0x00007fffe1c763d0

IPSEC: New outbound permit rule, SPI 0x8C14FD70

Src addr: 172.16.1.2

Src mask: 255.255.255.255

Dst addr: 10.1.1.2

Dst mask: 255.255.255.255

Src ports

Upper: 0

Lower: 0

Op   : ignore

Dst ports

Upper: 0

Lower: 0

Op   : ignore

Protocol: 50

Use protocol: true

SPI: 0x8C14FD70

Use SPI: true

IPSEC: Completed outbound permit rule, SPI 0x8C14FD70

Rule ID: 0x00007fffe1c76a00

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, NP encrypt rule look up for crypto map outside_dyn_map 10 matching ACL Unknown: returned cs_id=e148a8b0; encrypt_rule=00000000; tunnelFlow_rule=00000000

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2, Security negotiation complete for User ()  Responder, Inbound SPI = 0x7ad72e0d, Outbound SPI = 0x8c14fd70

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, IKE got a KEY_ADD msg for SA: SPI = 0x8c14fd70

IPSEC: New embryonic SA created @ 0x00007fffe13ab260,

SCB: 0xE1C00540,

Direction: inbound

SPI      : 0x7AD72E0D

Session ID: 0x00001000

VPIF num  : 0x00000002

Tunnel type: ra

Protocol   : esp

Lifetime   : 240 seconds

IPSEC: Completed host IBSA update, SPI 0x7AD72E0D

IPSEC: Creating inbound VPN context, SPI 0x7AD72E0D

Flags: 0x00000206

SA   : 0x00007fffe13ab260

SPI  : 0x7AD72E0D

MTU  : 0 bytes

VCID : 0x00000000

Peer : 0x000028D4

SCB  : 0x0AC5BD5B

Channel: 0x00007fffed817200

IPSEC: Completed inbound VPN context, SPI 0x7AD72E0D

VPN handle: 0x0000000000004174

IPSEC: Updating outbound VPN context 0x000028D4, SPI 0x8C14FD70

Flags: 0x00000205

SA   : 0x00007fffe1c75c00

SPI  : 0x8C14FD70

MTU  : 1500 bytes

VCID : 0x00000000

Peer : 0x00004174

SCB  : 0x0AC609F9

Channel: 0x00007fffed817200

IPSEC: Completed outbound VPN context, SPI 0x8C14FD70

VPN handle: 0x00000000000028d4

IPSEC: Completed outbound inner rule, SPI 0x8C14FD70

Rule ID: 0x00007fffe1c763d0

IPSEC: Completed outbound outer SPD rule, SPI 0x8C14FD70

Rule ID: 0x00007fffe1c76a00

IPSEC: New inbound tunnel flow rule, SPI 0x7AD72E0D

Src addr: 10.1.1.2

Src mask: 255.255.255.255

Dst addr: 172.16.1.2

Dst mask: 255.255.255.255

Src ports

Upper: 1701

Lower: 1701

Op   : equal

Dst ports

Upper: 1701

Lower: 1701

Op   : equal

Protocol: 17

Use protocol: true

SPI: 0x00000000

Use SPI: false

IPSEC: Completed inbound tunnel flow rule, SPI 0x7AD72E0D

Rule ID: 0x00007fffe13aba90

IPSEC: New inbound decrypt rule, SPI 0x7AD72E0D

Src addr: 10.1.1.2

Src mask: 255.255.255.255

Dst addr: 172.16.1.2

Dst mask: 255.255.255.255

Src ports

Upper: 0

Lower: 0

Op   : ignore

Dst ports

Upper: 0

Lower: 0

Op   : ignore

Protocol: 50

Use protocol: true

SPI: 0x7AD72E0D

Use SPI: true

IPSEC: Completed inbound decrypt rule, SPI 0x7AD72E0D

Rule ID: 0x00007fffe1c77420

IPSEC: New inbound permit rule, SPI 0x7AD72E0D

Src addr: 10.1.1.2

Src mask: 255.255.255.255

Dst addr: 172.16.1.2

Dst mask: 255.255.255.255

Src ports

Upper: 0

Lower: 0

Op   : ignore

Dst ports

Upper: 0

Lower: 0

Op   : ignore

Protocol: 50

Use protocol: true

SPI: 0x7AD72E0D

Use SPI: true

IPSEC: Completed inbound permit rule, SPI 0x7AD72E0D

Rule ID: 0x00007fffe13abb80

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Pitcher: received KEY_UPDATE, spi 0x7ad72e0d

May 18 04:17:18 [IKEv1 DEBUG]Group = DefaultRAGroup, IP = 10.1.1.2, Starting P2 rekey timer: 3420 seconds.

May 18 04:17:18 [IKEv1]Group = DefaultRAGroup, IP = 10.1.1.2,

PHASE 2 COMPLETED

(msgid=00000001)

May 18 04:17:18 [IKEv1]IKEQM_Active() Add L2TP classification rules: ip <10.1.1.2> mask <0xFFFFFFFF> port <1701>

May 18 04:17:21 [IKEv1]Group = DefaultRAGroup,

Username = test, IP = 10.1.1.2, Adding static route for client address: 192.168.1.1

Some of the commonly seen VPN related errors on Windows client are shown in this table

Error Code

Possible Solution

691

Ensure the username and password entered was correct

789,835

Ensure pre-shared-key configured on client machine was same as on ASA

800

1. Make sure that the VPN type is set to "Layer 2 Tunneling Protocol (L2TP)"

2. Ensure pre-shared-key was configured correctly configured

809

Make sure UDP port 500, 4500 ( in case either client or server is behind NAT device) and ESP traffic was not blocked

Related Information

- Cisco ASA 5500 Series Adaptive Security Appliances

- Most Common L2L and Remote Access IPsec VPN Troubleshooting Solutions

- Technical Support & Documentation - Cisco Systems