Multiple GRE Tunnels with the same source address

December 20, 2010 2 Comments

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2 Responses to Multiple GRE Tunnels with the same source address

  1. Paul says:
    February 10, 2011 at 2:44 pm

    I’m having trouble understanding why you need the jey statement. I would have though that the router can keep track of which site the tunnel traffic by it’s source address, is this not the case ? We have a number of GRE tunnels all with the same source address out to different hosts on the internet and have never need to use the GRE key statement.

    Reply
    • pierky says:
      February 10, 2011 at 3:05 pm

      Hi Paul,

      thanks for your note.

      I wrote this post after I had a problem while setting up a GRE VPN with 3 old 1760 routers. I could not bring it up until I added the tunnel key statement on the config on all 3 routers. I thought IOS needed it as tiebreaker.

      Right now I tested the same scenario in a very simple lab, using different IOS releases and platforms, and I found it’s working without the “tunnel key” statement too. May be the problem I faced was just related to that platform/IOS pair.

      As soon as I can find the right IOS used for that project I’ll try to reproduce the issue; in the meantime I’ll bring this post off-line, in order to avoid confusion and misleading informations.

      Many thanks,

      Pierky

      Reply

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