L2L VPN Drops Every 5 Mins with Linksys Router and AT&T U-Verse 2 Wire RG
Posted on 2008-11-15
Hi everyone - hoping someone may have experienced this or have some insight for me:
I have a linksys VPN router (WRG54G) that does a Lan-to-Lan VPN tunnel to my office (VPN Concentrator). I had Time Warner cable Internet for years and all worked fine. I switched to AT&T U-Verse on Thursday and here is what I have done:
AT&T has a 2Wire residential gateway. I changed the private address of the 2wire so it doesn't conflict with my Linksys. On the 2Wire, I put the Linksys router into the DMZPlus Mode and the Linksys then got the public IP address on its interface. So far, so good and I was able to change my VPN Concentrator at work and the VPN tunnel came up and two-way communications are fine.
However, I now noticed the L2L VPN tunnel drops literally every 5 minutes, all day long. It reconnects itself after about 15-20 seconds. This is evident by looking at my Cisco MARS logs and I can see the public IP drop exactly at 4 minutes, 59 seconds all day long.
Obviously not good. Anybody have a fix for this or experienced something similar?