Verifying Cisco IPSEC VPN Connections

The following two commands can be used to verify Cisco VPN connections:

Router#show crypto ipsec sa

This command displays the settings used by the current Security Associations (SAs).

Router#show crypto isakmp sa

This command displays current IKE Security Associations.

Troubleshooting VPN Connections:

After confirming physical connectivity, audit both ends of the VPN connection to ensure they mirror each other.

Use debugging to analyze VPN connection difficulties:

Router#debug crypto isakmp

This command allows you to observe Phase 1 ISAKMP negotiations.

Router#debug crypto ipsec

This command allows you to observe Phase 2 IPSec negotiations.

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