VPN setup on IOS

I have to send a 1750 router to a new branch, so we can use peer VPN networking. This one is different for me -- the ISP router has an inside (my side) address of It's expecting me to be The devices on the network are (128 mask -- the other half of the C net is for VOIP).

I'm a generalist here, and am not overly familiar with all the capabilities of IOS. When I try to give the two ports addresses like and, the router complains that they overlap.

If someone would be willing to point me in the right direction, I'd appreciate it.


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You can not have two Layer-3 ports in the same subnet, as this doesnt make any sense for a router. a router routes between to segments, and inorder for it to work with TCP/IP you need different IP subnet on each interface, inorder to route packet between them. So you will end up with a "link-net" between yout ISP-CPE router, and your own router's outside interface, and then a new IP net on the router inside interface. Also make sure that your ISP will have installed a default NAT rules that forwards EVERYTHING into your routers outside IP.

HTH Martin

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Martin Bilgrav

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