Contents

Introduction

Prerequisites

Requirements

Components Used

Conventions

Network Diagram

Background Information

Add an Additional L2L Tunnel to the Configuration

Step-by-Step Instructions

Example Configuration

Add a Remote Access VPN to the Configuration

Step-by-Step Instructions

Example Configuration

Verify

Troubleshoot

Related Information

Introduction

This document provides the steps required to add a new VPN tunnel or a remote access VPN to a L2L VPN configuration that already exists. Refer to Cisco ASA 5500 Series Adaptive Security Appliances - Configuration Examples and TechNotes for information on how to create the initial IPSec VPN tunnels and for more configuration examples.

Prerequisites

Requirements

Ensure that you correctly configure the L2L IPSEC VPN tunnel that is currently operational before you attempt this configuration.

Components Used

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

- Two ASA security appliances that run 7.x code

- One PIX security appliance that runs 7.x code

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, make sure that you understand the potential impact of any command.

Conventions

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

Network Diagram

This document uses this network setup:

This output is the current running configuration of the NY (HUB) security appliance. In this configuration, there is an IPSec L2L tunnel configured between NY(HQ) and TN.

Current NY (HQ) Firewall Configuration

ASA-NY-HQ#show running-config

: Saved

:

ASA Version 7.2(2)

!

hostname ASA-NY-HQ

domain-name corp2.com

enable password WwXYvtKrnjXqGbu1 encrypted

names

!

interface Ethernet0/0

nameif outside

security-level 0

ip address 192.168.11.2 255.255.255.0

!

interface Ethernet0/1

nameif inside

security-level 100

ip address 172.16.1.2 255.255.255.0

!

interface Ethernet0/2

shutdown

no nameif

no security-level

no ip address

!

interface Ethernet0/3

shutdown

no nameif

no security-level

no ip address

!

interface Management0/0

shutdown

no nameif

no security-level

no ip address

!

passwd 2KFQnbNIdI.2KYOU encrypted

ftp mode passive

dns server-group DefaultDNS

domain-name corp2.com

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0

10.10.10.0 255.255.255.0

access-list outside_20_cryptomap extended permit ip 172.16.1.0 255.255.255.0

10.10.10.0 255.255.255.0

!--- Output is suppressed.

nat-control

global (outside) 1 interface

nat (inside) 0 access-list inside_nat0_outbound

nat (inside) 1 172.16.1.0 255.255.255.0

route outside 0.0.0.0 0.0.0.0 192.168.11.100 1

timeout xlate 3:00:00

timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout uauth 0:05:00 absolute

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

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

crypto map outside_map 20 match address outside_20_cryptomap

crypto map outside_map 20 set peer 192.168.10.10

crypto map outside_map 20 set transform-set ESP-3DES-SHA

crypto map outside_map interface outside

crypto isakmp enable outside

crypto isakmp policy 10

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

crypto isakmp nat-traversal  20

tunnel-group 192.168.10.10 type ipsec-l2l

tunnel-group 192.168.10.10 ipsec-attributes

pre-shared-key *

telnet timeout 1440

ssh timeout 5

console timeout 0

!

class-map inspection_default

match default-inspection-traffic

!

!

policy-map type inspect dns preset_dns_map

parameters

message-length maximum 512

policy-map global_policy

class inspection_default

inspect dns preset_dns_map

inspect ftp

inspect h323 h225

inspect h323 ras

inspect netbios

inspect rsh

inspect rtsp

inspect skinny

inspect esmtp

inspect sqlnet

inspect sunrpc

inspect tftp

inspect sip

inspect xdmcp

!

service-policy global_policy global

prompt hostname context

Cryptochecksum:a3aa2afb37dcad447031b7b0c8ea65d3

: end

ASA-NY-HQ#

Background Information

Currently, there is an existing L2L tunnel set up between the NY(HQ) office and TN office. Your company has recently opened a new office that is located in TX. This new office requires connectivity to local resources that are located in the NY and TN offices. In addition, there is an additional requirement to allow employees the opportunity to work from home and securely access resources that are located on the internal network remotely. In this example, a new VPN tunnel is configured as well as a remote access VPN server that is located in the the NY office.

In this example, two commands are used in order to allow the communication between the VPN networks and identify the traffic that should be tunneled or encrypted. This enables you to have access to the internet without having to send that traffic through the VPN tunnel. In order to configure these two options, issue the split-tunnel and same-security-traffic commands.

Split tunneling allows a remote-access IPSec client to conditionally direct packets over an IPSec tunnel in encrypted form, or to a network interface in clear text form. With split tunneling enabled, packets not bound for destinations on the other side of the IPSec tunnel do not have to be encrypted, sent across the tunnel, decrypted, and then routed to a final destination. This command applies this split tunneling policy to a specified network. The default is to tunnel all traffic. In order to set a split tunneling policy, issue the split-tunnel-policy command in the group-policy configuration mode. In order to remove the split-tunneling-policy from the configuration, issue the no form of this command.

The security appliance includes a feature that allows a VPN client to send IPSec-protected traffic to other VPN users by allowing such traffic in and out of the same interface. Also called hairpinning, this feature can be thought of as VPN spokes (clients) that connect through a VPN hub (security appliance). In another application, this feature can redirect incoming VPN traffic back out through the same interface as unencrypted traffic. This is useful, for example, to a VPN client that does not have split tunneling but needs to both access a VPN and browse the web. In order to configure this feature, issue the same-security-traffic intra-interface command in the global configuration mode.

Add an Additional L2L Tunnel to the Configuration

This is the network diagram for this configuration:

Step-by-Step Instructions

This section provides the required procedures that must be performed on the HUB (NY Firewall) security appliance. Refer to the PIX/ASA 7.x: Simple PIX-to-PIX VPN Tunnel Configuration Example for more information on how to configure the spoke client (TX Firewall).

Complete these steps:

1. Create these two new access-lists to be used by the crypto map in order to define interesting traffic:

- ASA-NY-HQ(config)#access-list outside_30_cryptomap

extended permit ip 172.16.1.0 255.255.255.0

20.20.20.0 255.255.255.0

- ASA-NY-HQ(config)#access-list outside_30_cryptomap

extended permit ip 10.10.10.0 255.255.255.0

20.20.20.0 255.255.255.0

Warning: In order for the communication to take place, the other side of the tunnel must have the opposite of this access control list (ACL) entry for that particular network.

2. Add these entries to the no nat statement in order to exempt the nating between these networks:

- ASA-NY-HQ(config)#access-list inside_nat0_outbound

extended permit ip 172.16.1.0 255.255.255.0

20.20.20.0 255.255.255.0

- ASA-NY-HQ(config)#access-list inside_nat0_outbound

extended permit ip 10.10.10.0 255.255.255.0

20.20.20.0 255.255.255.0

- ASA-NY-HQ(config)#access-list inside_nat0_outbound

extended permit ip 20.20.20.0 255.255.255.0

10.10.10.0 255.255.255.0

Warning: In order for the communication to take place, the other side of the tunnel must have the opposite of this ACL entry for that particular network.

3. Issue this command in order to enable a host on the TX VPN network to have access to the TN VPN tunnel:

- ASA-NY-HQ(config)#same-security-traffic permit

intra-interface

This allows VPN peers to talk between each other.

4. Create the crypto map configuration for the new VPN tunnel. Use the same transform set that was used in the first VPN configuration, as all the phase 2 settings are the same.

- ASA-NY-HQ(config)#crypto map outside_map 30 match

address outside_30_cryptomap

- ASA-NY-HQ(config)#crypto map outside_map 30 set

peer 192.168.12.2

- ASA-NY-HQ(config)#crypto map outside_map 30 set

transform-set

ESP-3DES-SHA

5. Create the tunnel-group that is specified for this tunnel along with attributes needed to connect to the remote host.

- ASA-NY-HQ(config)#tunnel-group 192.168.12.2 type

ipsec-l2l

- ASA-NY-HQ(config)#tunnel-group 192.168.12.2

ipsec-attributes

- ASA-NY-HQ(config-tunnel-ipsec)#pre-shared-key

cisco123

Note: The pre-shared-key must match exactly on both sides of the tunnel.

6. Now that you have configured the new tunnel, you must send interesting traffic across the tunnel in order to bring it up. In order to perform this, issue the source ping command to ping a host on the inside network of the remote tunnel.

In this example, a workstation on the other side of the tunnel with the address 20.20.20.16 is pinged. This brings the tunnel up between NY and TX. Now, there are two tunnels connected to the HQ office. If you do not have access to a system behind the tunnel, refer to Most Common IPSec VPN Troubleshooting Solutions to find an alternate solution in respect to using management-access.

Example Configuration

Example Configuration 1

ASA-NY-HQ#show running-config

: Saved

:

ASA Version 7.2(2)

!

hostname ASA-NY-HQ

domain-name corp2.com

enable password WwXYvtKrnjXqGbu1 encrypted

names

!

interface Ethernet0/0

nameif outside

security-level 0

ip address 192.168.11.1 255.255.255.0

!

interface Ethernet0/1

nameif inside

security-level 100

ip address 172.16.1.2 255.255.255.0

!

interface Ethernet0/2

shutdown

no nameif

no security-level

no ip address

!

interface Ethernet0/3

shutdown

no nameif

no security-level

no ip address

!

interface Management0/0

shutdown

no nameif

no security-level

no ip address

!

passwd 2KFQnbNIdI.2KYOU encrypted

ftp mode passive

dns server-group DefaultDNS

domain-name corp2.com

same-security-traffic permit intra-interface

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 10.10.10.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 20.20.20.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_20_cryptomap extended permit ip 172.16.1.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_20_cryptomap extended permit ip 20.20.20.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_30_cryptomap extended permit ip 172.16.1.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list outside_30_cryptomap extended permit ip 10.10.10.0 255.255.255.0 20.20.20.0

255.255.255.0

logging enable

logging asdm informational

mtu outside 1500

mtu inside 1500

mtu man 1500

no failover

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

nat-control

global (outside) 1 interface

nat (inside) 0 access-list inside_nat0_outbound

nat (inside) 1 172.16.1.0 255.255.255.0

route outside 0.0.0.0 0.0.0.0 192.168.11.1 1

timeout xlate 3:00:00

timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout uauth 0:05:00 absolute

username sidney password 3xsopMX9gN5Wnf1W encrypted privilege 15

aaa authentication telnet console LOCAL

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

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

crypto map outside_map 20 match address outside_20_cryptomap

crypto map outside_map 20 set peer 192.168.10.10

crypto map outside_map 20 set transform-set ESP-3DES-SHA

crypto map outside_map 30 match address outside_30_cryptomap

crypto map outside_map 30 set peer 192.168.12.2

crypto map outside_map 30 set transform-set ESP-3DES-SHA

crypto map outside_map interface outside

crypto isakmp enable outside

crypto isakmp policy 10

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

crypto isakmp nat-traversal  20

tunnel-group 192.168.10.10 type ipsec-l2l

tunnel-group 192.168.10.10 ipsec-attributes

pre-shared-key *

tunnel-group 192.168.12.2 type ipsec-l2l

tunnel-group 192.168.12.2 ipsec-attributes

pre-shared-key *

telnet timeout 1440

ssh timeout 5

console timeout 0

!

class-map inspection_default

match default-inspection-traffic

!

!

policy-map type inspect dns preset_dns_map

parameters

message-length maximum 512

policy-map global_policy

class inspection_default

inspect dns preset_dns_map

inspect ftp

inspect h323 h225

inspect h323 ras

inspect netbios

inspect rsh

inspect rtsp

inspect skinny

inspect esmtp

inspect sqlnet

inspect sunrpc

inspect tftp

inspect sip

inspect xdmcp

!

service-policy global_policy global

prompt hostname context

Cryptochecksum:5a184c8e5e6aa30d4108a55ac0ead3ae

: end

ASA-NY-HQ#

Add a Remote Access VPN to the Configuration

This is the network diagram for this configuration:

Step-by-Step Instructions

This section provides the required procedures to add remote access capability and to allow remote users to access all sites. Refer to PIX/ASA 7.x ASDM: Restrict the Network Access of Remote Access VPN Users for more information on how to configure the remote access server and restrict access.

Complete these steps:

1. Create an IP address pool to be used for clients that connect via the VPN tunnel. Also, create a basic user in order to access the VPN once the configuration is completed.

- ASA-NY-HQ(config)#ip local pool Hill-V-IP

10.10.120.10-10.10.120.100 mask 255.255.255.0

- ASA-NY-HQ(config)#username cisco password

cisco111

2. Exempt specific traffic from being nated.

- ASA-NY-HQ(config)#access-list

inside_nat0_outbound extended permit ip 172.16.1.0

255.255.255.0 10.10.120.0 255.255.255.0

- ASA-NY-HQ(config)#access-list

inside_nat0_outbound extended permit ip 10.10.120.0

255.255.255.0 10.10.10.0 255.255.255.0

- ASA-NY-HQ(config)#access-list

inside_nat0_outbound extended permit ip 10.10.120.0

255.255.255.0 20.20.20.0 255.255.255.0

Notice that the nat communication between VPN tunnels is exempted in this example.

3. Allow communication between the L2L tunnels that are already created.

- ASA-NY-HQ(config)#access-list

outside_20_cryptomap extended permit ip 10.10.120.0

255.255.255.0 10.10.10.0 255.255.255.0

- ASA-NY-HQ(config)#access-list

outside_30_cryptomap extended permit ip 10.10.120.0

255.255.255.0 20.20.20.0 255.255.255.0

This allows remote access users the ability to communicate with networks behind the specified tunnels.

Warning: In order for the communication to take place, the other side of the tunnel must have the opposite of this ACL entry for that particular network.

4. Configure the traffic that will be encrypted and sent across the VPN tunnel.

- ASA-NY-HQ(config)#access-list

Hillvalley_splitunnel standard permit 172.16.1.0

255.255.255.0

- ASA-NY-HQ(config)#access-list

Hillvalley_splitunnel standard permit 10.10.10.0

255.255.255.0

- ASA-NY-HQ(config)#access-list

Hillvalley_splitunnel standard permit 20.20.20.0

255.255.255.0

5. Configure local authentication and policy information, such as wins, dns and IPSec protocols, for the VPN clients.

- ASA-NY-HQ(config)#group-policy Hillvalley

internal

- ASA-NY-HQ(config)#group-policy Hillvalley

attributes

- ASA-NY-HQ(config-group-policy)#wins-server

value 10.10.10.20

- ASA-NY-HQ(config-group-policy)#dns-server value

10.10.10.20

- ASA-NY-HQ(config-group-policy)#vpn-tunnel-protocol

IPSec

6. Set IPSec and general attributes, such as pre-shared keys and IP address pools, that will be used by the Hillvalley VPN tunnel.

- ASA-NY-HQ(config)#tunnel-group Hillvalley

ipsec-attributes

- ASA-NY-HQ(config-tunnel-ipsec)#pre-shared-key

cisco1234

- ASA-NY-HQ(config)#tunnel-group Hillvalley

general-attributes

- ASA-NY-HQ(config-tunnel-general)#address-pool

Hill-V-IP

- ASA-NY-HQ(config-tunnel-general)#default-group-policy

Hillvalley

7. Create the split tunnel policy that will use the ACL created in step 4 in order to specify what traffic will be encrypted and passed through the tunnel.

- ASA-NY-HQ(config)#split-tunnel-policy

tunnelspecified

- ASA-NY-HQ(config)#split-tunnel-network-list value

Hillvalley_splitunnel

8. Configure the cryto map information required to the VPN tunnel creation.

- ASA-NY-HQ(config)#crypto ipsec transform-set

Hill-trans esp-3des esp-sha-hmac

- ASA-NY-HQ(config)#crypto dynamic-map

outside_dyn_map 20 set transform-set

Hill-trans

- ASA-NY-HQ(config)#crypto dynamic-map dyn_map 20

set reverse-route

- ASA-NY-HQ(config)#crypto map outside_map 65535

ipsec-isakmp dynamic

outside_dyn_map

Example Configuration

Example Configuration 2

ASA-NY-HQ#show running-config

: Saved

hostname ASA-NY-HQ

ASA Version 7.2(2)

enable password WwXYvtKrnjXqGbu1 encrypted

names

!

interface Ethernet0/0

nameif outside

security-level 0

ip address 192.168.11.2 255.255.255.0

!

interface Ethernet0/1

nameif inside

security-level 100

ip address 172.16.1.2 255.255.255.0

!

interface Ethernet0/2

shutdown

no nameif

no security-level

no ip address

!

interface Ethernet0/3

shutdown

no nameif

no security-level

no ip address

!

interface Management0/0

shutdown

no nameif

no security-level

no ip address

!

passwd 2KFQnbNIdI.2KYOU encrypted

ftp mode passive

dns server-group DefaultDNS

domain-name corp2.com

same-security-traffic permit intra-interface

!--- This is required for communication between VPN peers.

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 10.10.10.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 20.20.20.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 10.10.120.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 172.16.1.0 255.255.255.0 10.10.120.0

255.255.255.0

access-list inside_nat0_outbound extended permit ip 10.10.120.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_20_cryptomap extended permit ip 172.16.1.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_20_cryptomap extended permit ip 20.20.20.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list outside_20_cryptomap extended permit ip 10.10.120.0 255.255.255.0 10.10.10.0

255.255.255.0

access-list Hillvalley_splitunnel standard permit 172.16.1.0 255.255.255.0

access-list Hillvalley_splitunnel standard permit 10.10.10.0 255.255.255.0

access-list Hillvalley_splitunnel standard permit 20.20.20.0 255.255.255.0

access-list outside_30_cryptomap extended permit ip 172.16.1.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list outside_30_cryptomap extended permit ip 10.10.10.0 255.255.255.0 20.20.20.0

255.255.255.0

access-list outside_30_cryptomap extended permit ip 10.10.120.0 255.255.255.0 20.20.20.0

255.255.255.0

logging enable

logging asdm informational

mtu outside 1500

mtu inside 1500

mtu man 1500

ip local pool Hill-V-IP 10.10.120.10-10.10.120.100 mask 255.255.255.0

no failover

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

nat-control

global (outside) 1 interface

nat (inside) 0 access-list inside_nat0_outbound

nat (inside) 1 172.16.1.0 255.255.255.0

route outside 0.0.0.0 0.0.0.0 192.168.11.1 1

timeout xlate 3:00:00

timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

timeout uauth 0:05:00 absolute

group-policy Hillvalley internal

group-policy Hillvalley attributes

wins-server value 10.10.10.20

dns-server value 10.10.10.20

vpn-tunnel-protocol IPSec

split-tunnel-policy tunnelspecified

split-tunnel-network-list value Hillvalley_splitunnel

default-domain value corp.com

username cisco password dZBmhhbNIN5q6rGK encrypted

aaa authentication telnet console LOCAL

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

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

crypto ipsec transform-set Hill-trans esp-3des esp-sha-hmac

crypto dynamic-map outside_dyn_map 20 set transform-set Hill-trans

crypto dynamic-map dyn_map 20 set reverse-route

crypto map outside_map 20 match address outside_20_cryptomap

crypto map outside_map 20 set peer 192.168.10.10

crypto map outside_map 20 set transform-set ESP-3DES-SHA

crypto map outside_map 30 match address outside_30_cryptomap

crypto map outside_map 30 set peer 192.168.12.1

crypto map outside_map 30 set transform-set ESP-3DES-SHA

crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map

crypto map outside_map interface outside

crypto isakmp enable outside

crypto isakmp policy 10

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

crypto isakmp nat-traversal  20

tunnel-group 192.168.10.10 type ipsec-l2l

tunnel-group 192.168.10.10 ipsec-attributes

pre-shared-key *

tunnel-group 192.168.12.2 type ipsec-l2l

tunnel-group 192.168.12.2 ipsec-attributes

pre-shared-key *

tunnel-group Hillvalley type ipsec-ra

tunnel-group Hillvalley general-attributes

address-pool Hill-V-IP

default-group-policy Hillvalley

tunnel-group Hillvalley ipsec-attributes

pre-shared-key *

telnet timeout 1440

ssh timeout 5

console timeout 0

!

class-map inspection_default

match default-inspection-traffic

!

!

policy-map type inspect dns preset_dns_map

parameters

message-length maximum 512

policy-map global_policy

class inspection_default

inspect dns preset_dns_map

inspect ftp

inspect h323 h225

inspect h323 ras

inspect netbios

inspect rsh

inspect rtsp

inspect skinny

inspect esmtp

inspect sqlnet

inspect sunrpc

inspect tftp

inspect sip

inspect xdmcp

!

service-policy global_policy global

prompt hostname context

Cryptochecksum:62dc631d157fb7e91217cb82dc161a48

ASA-NY-HQ#

Verify

Use this section to confirm that your configuration works properly.

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

- ping inside x.x.x.x (IP address of host on opposite side of tunnel)—This command allows you to send traffic down the tunnel using the a source address of the inside interface.

Troubleshoot

Refer to these documents for information you can use in order to troubleshoot your configuration:

- Most Common IPSec VPN Troubleshooting Solutions

- IP Security Troubleshooting - Understanding and Using debug Commands

- Troubleshoot Connections through the PIX and ASA

Related Information

- An Introduction to IP Security (IPSec) Encryption

- IPSec Negotiation/IKE Protocols Support Page

- Cisco ASA 5500 Series Adaptive Security Appliances Command References

- Technical Support & Documentation - Cisco Systems