Cisco ASA show VPN users

To find out remote clients connected to Cisco ASA Firewall, use the command:

sh vpn-sessiondb remote

There are other useful options for this command, such as:
sh vpn-sessiondb l2l --> for IPSec L2L connections
sh vpn-sessiondb svc --> for SSL and anyconnect connections
sh vpn-sessiondb webvpn --> for WebVPN sessions

If you are looking for a specific user, use the following command:
sh vpn-sessiondb remote filter USERNAME

The option exists for l2l, svc and WebVPN as well.

Cisco Router Specification regarding VPN Tunnels

Just to help not to be confused, like me... Long time ago I faced an issue regarding the limit of VPN tunnels on Cisco 3800 series router. In the specification you read :

• Up to 2500 VPN tunnels

I had a 3845 router with around 700 VPN Tunnels, but the router was not able to manage the tunnels and they were flapping non-stop! I looked long time for the source of problem until the time that I decided to reduce the number of tunnels with the batch of 20 tunnels. I got the stability when I reached a specific number of tunnels in the router.