I created VPN L2L between ASA 5520 and ASA5510 since 4 mothes , it worked fine
but since yesterday , the ping is fail although the tunnel is UP
I checked the ACL ,and the routing but still the same problem
so what do you think?
I would recommend to you checking the following:
1- show crypto ikev1 sa
2- show crypto ipsec sa peer remote_peer_public_ip
1- Is the tunnel up?
2- Is the ASA encrypting your ICMP packets?
Please make sure to at least verify the basic stuff, like the state of the VPN tunnel, for instance.