2wire router + dmz = no UDP tracking

Discussion in 'Networking Issues' started by EOC_Jason, Sep 19, 2011.

  1. EOC_Jason

    EOC_Jason LI Guru Member

    I have two routers with an OpenVPN link between them (home & office). For the past couple weeks I've been trying to trace down a bug where the link keeps getting re-established every 10 minutes.

    On the server side I had OpenVPN running on both a linux box and on a WNR3500L w/tomato. Both logs showed the same thing... Every 10 minutes the client would reconnect (but the old link never was disconnected).

    Ruling out any issues on the server side I started looking at the client side. The client was a WRT54GS running DD-WRT. At first I read someone with a similar issue regenerated their certs/keys and that solved their problem. I did that and nothing changed... So then I flashed a different build of DD-WRT claimed to be a good stable build... Still had the same issues.

    At home we have AT&T U-Verse with their crappy 2wire router that has so few user-configurable features that it's a wonder the thing works at all. Anyhow, digging through the few pages there are I saw that UDP timout was set at 600 seconds (10 minutes). AH HA! (So I thought)... I changed the time to the max allowed. However, the issue persisted every 10 minutes! WTF?

    Finally I thought to myself. Since I had my WRT set as the DMZ device (a change I only made recently), perhaps that was the issue? So I changed the UDP session timeout back, un-set my WRT as the DMZ...

    Guess what? The session issues with OpenVPN went away and now log notices are back to minimal things...

    I swear the 2wire products will be the end of me... I can't believe AT&T insists on using those pieces of junk.

    This is just some friendly information in case there is someone else out on the internet with the exact same problem as me. ;)
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