simulated WAN

Unanswered Question
Mar 11th, 2008

I am wanting to hook up a simulated WAN with an ISR 2821 to an ISR 1811. I want to assign a separate network on each outside interface, and then hook them together and pass data between the two different networks. Is there a possible way to make this happen? Thanks in advance for any response that I get.

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Paolo Bevilacqua Tue, 03/11/2008 - 14:17

Sure, usually people use serial interfaces with DCE cables, and adjust clock to simulate different circuit speeds.


Hope this helps, please rate post if it does!

mgmcelwee Wed, 03/12/2008 - 10:25

Unfortunately, I do not have serial ports or DCE cables. I am wanting to hook them together going from outside interface G0/0 (2821) to outside interface FE0/0 (1811) using an ethernet cable. I am getting a link light on both routers when I hook them together, but I am not able to pass data between them. I should be able to at least ping on router to the other right? Is there a certain routing statement that I need to add in order for this scenario to work?

meballard Wed, 03/12/2008 - 10:38

The easiest way would be to just assign both of those outside interfaces an ip address in the same subnet. It would then treat it as a point to point WAN link over Ethernet.


To use different addresses between the two to fully simulate a WAN link between two locations across another network, you would ideally want another router in between that can route between the two subnets.

mgmcelwee Wed, 03/12/2008 - 12:35

I wanted to keep them on the different subnets, so what I ended up doing is building a VPN tunnel between the two routers. Once the tunnel came in I was able to pass data across from on PC on one network to another PC on the other network. I also had to assign a static route statement that pointed all traffic on the routers to point to the outside interfaces. Worked like a charm once everything was in place. Thanks to everyone for all your help!

Collin Clark Wed, 03/12/2008 - 10:48

I usually use a layer 3 switch as the cloud. It's nice because you can emulate real public IP's at each end (assuming this a lab environment that never touches the public internet).

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