I have a site to site VPN between a 5510 and a 5505. About a month ago the VPN started dropping about 4 times a day for exactly 10 mins each time. Has anyone else seen this and have you found a solution?
Have you verified that your circuit is not dropping, thereby causing the vpn tunnel to drop. Look for connection resets on your routers serial interfaces.
Are you sure that you don't lose power or physical connection at either site?
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