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Using a Cisco DPC 2100 Cable Modem with a Router

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This falls under the category of “I should have figured this out sooner”.

Recently we had cable internet installed at our house.  The technician installed and tested the modem, a Cisco DPC 2100r2, via Ethernet to a computer.  It was working great and he left.  Later that day I tried to plug it into a router to share with my systems.  It didn’t work.  On and off for the next few days I toyed with settings all over my router trying to figure out why it didn’t like the cable modem which always worked fine plugged directly into a computer.  Finally it dawned on me that I was using a cross over Ethernet cable (which looks just like a normal Ethernet cable).  Switching to a normal cable resolved the problem immediately.

For those that don’t know, a cross over cable flips the send and receive lines.  When going straight from a modem to a computer this is what you want, and this is what was packaged with the modem.  You would use this type of cable when going from computer to computer.  Many devices now automatically detect if the cable isn’t the right type and correct automatically.  I’ve gotten used to this apparently so it didn’t occur to me to check the cable.



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