Issue in Tunnel re-establishment

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Nov 19th, 2009
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I successfully establised the IPsec between 2 end points which consistes of ASA followed by a router on both ends. Then i configured the GRE Tunnel between 2 end and configured OSPF. No problem in OSPF Neighbour formation. But, couple of issues

  1. When the Router reloads then the GRE is not establishing unless i execute the "clear xlate" on the ASA. when i clear the tunnel everything is working fine. Tunnel is back to normal
  2. Inorder to overcome the above issue I change the default tunnel mode to "tunnel mode ipip". The tunnel is reestablishing automatically when the router reloads and i dont have to clear the tunnel. But the OSPF is not working when "tunnel mode ipip" is used.

What could be the reason for this



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Giuseppe Larosa Fri, 11/20/2009 - 10:18
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Hello Logesh,

you may want to post this in security -> firewall forum.

OSPF over GRE tunnel works, I never heard of OSPF over that other tunnel mode.

You should look for a solution that allows you to use GRE tunnel between routers.

Hope to help



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