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vigor 2800 and vpn issues?

  • george.hindson
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15 Sep 2011 10:59 #69392 by george.hindson
vigor 2800 and vpn issues? was created by george.hindson
hi there,
i am having an issue keeping a vpn up and running reliably between 2 vigor 2800 adsl routers located in different offices.
i have noticed in the "dialing" router syslog vpn log section has the following error message-

Initiating IKE Main Mode to 91......
Nat-Traversal; using RFC 3947, no NAT detected.

then the router procedes to re-establish the vpn connection.
this happens 2 or 3 times a day at seemingly random times.
Internet access is not affected from either router during the breakdown of the vpn - so its not the microfilters?
very occasionally the vpn line has to be dropped via its control interface and redialed.

the vpn had been working fine for about 2 years, dropping once every 100 hours or so.
both routers have the same firmware 2.8.1_RC3
any help will be much appreciated.
thanks
george

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