ASA IPsec VPN disconnect and re-connect

[ronald.su]

we have  a lan to lan IPSec VPN, and it will disconnect 1 or 2 times everyday randomly,  and it will auto re-connect after 5 ~10 minutes.

we want to check the log to get the cause. I wondering if something can tell me how to get the log?

the command  #show logging is not really help.....

thanks

[Dennis Mink]

Does this tunnel constantly carry traffic or is it every now and the in batch?  Because the isakmp keys have limited life time and need renegotiation. Does the diaconnect occured afyer a set period each time?

[ronald.su]

we have a ping IP -t to make sure every second will have a icmp packet, but still disconnect

[ronald.su]

hello ?