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Link two Cisco uBR cable modems back to back

I have a network issue in which I need to test setting up routing and a VPN tunnel between to Cisco cable modems (ubr924s).  The thing is, I don't have a cable connection in my lab environment.  I am racking my brains for a way to connected to cisco cable modems back to back using the cablemodem0 interfaces.  Is this possible without the cable network head-end equipment (ie. is there an easy way to emulate a cable network the way you would a crossover T1 cable between two routers with T1 cards)?

I am guessing this may be like ISDN.....go out and buy something.  Anyone have any creative ideas?
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jhartlov
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jhartlov
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Scotty_ciscoCommented:
You can not do this without the upstream equipment the framing ans line code is different.  I don't even know if you can buy an emulator .... the UBR is EOL/EOS and not supported even on new code for 12.3 or 12.4

O jave worked with these quite a bit with comcast ... what is it that you are trying to accomplish and maybe we can help you with that.

Thanks
Scott
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jhartlovAuthor Commented:
Scott;

I am looking to experiment with ubr to ubr tunnels between cable sites.  I wanted to test it in a lab environment prior to rolling it out.
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Scotty_ciscoCommented:
Well I can tell you that these units do not have a lot of CPU power and that you can kill them very easily.  I actually got rid of mine recently because of the limitation of the 10Mb 1/2 duplex hub on the back.

I had tunnel's setup between 4 sites just using GRE no encryption and it worked ok I used rip V2 to advertise routes for local networks and access-lists to distribute only routes learned that I wanted learned.

What are you trying to do I would be more than happy to add my 2cents

Thanks
Scott
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