tunnel over tunnel enquiry

[bigeric]

Dear Sir,

I would like to know if the following setup works

Host A -- Router A --- Gre Tunnel -- Router B ---- Router C --- Gre Tunnel --- Router D --- Host B

For some reasons, I had to build another GRE tunnel between Router A and Router D (the tunnel end is the loopback interface of router A and D which can communicate with each other)

In this tunnel over tunnel topology, can host A communicate with host B ?

thx

Eric

[Harold Ritter]

If you were able to run a tunnel between rtrA and rtrD, it is at least that you have connectivity between these two devices loopback address.

You shouldn't have to build a tunnel between A and D to get connectivity. As long as you have a dynamic routing protocol (or static) carrying subnet information from A to D and vice versa, it should be ok.

Before building the second tunnel, did you check that the subnet connected to host B was seen on router A and subnet connected to host A was seen on router D?

Hope this helps,