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GRE tunnel problem

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5 replies

by roman_empire

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I am trying to setup a GRE tunnel between network A 10.10.10.0 with mask 255.255.255.128 and network B 20.20.20.0 with mask 255.255.255.192. After I've setup routers on both sides with Tunnel0. I am getting "% Network not in table" error message. What could be the problem? Where on the web other then cisco.com I can look for information about setting up gre tunnel.
If you need more details or want to email me any docs my address is roman@natlmedia.com. THanks

5 replies

by justemazing

Make sure your routers are configured to allow GRE protocol to pass. By default, most routers deny GRE.

You must enable GRE protocol (47) to pass on all ports. Note: 47 is not a port but is the numerical identifier for GRE protocol.

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