The router assigns them each a fixed IP address.  Computer 1 is 192.168.2.36, and computer 2 is 192.168.2.22.  The router is 192.168.2.1. My ISP is now AT&T, which took over when Excite@home bellied up.  It is a new and different network.

Both computers work fine when connected directly to the cable modem individually, so something is wrong with the router/switchbox, which is only about two months old.  I will try resetting it to factory defaults and setting it up from scratch.  If that doesn't work I'll send it back to the factory, SMC.  I think it is having compatibility problems with the way AT&T set up its new network.  You now have a network that starts with 10.??.??.?? that is not available to nonmembers.  It is way more secure than excite@home was.  If anyone has other ideas I might try, I am still listening.  Thanks.

>Have you checked that your computers did not get the same IP address? Do you
>use static IP addresses or DHCP?
>
>/Göran Halfvarson, Sweden
>
>|Computer 1 had no problems. Both
>| computers could see each other and trade files.  The network
>| printer worked fine. Computer 2 could not ping the router or
>| open its config screen. Computer 1 opened the config screen.
>| What I saw is that only one computer is showing up as
>| connected, and the IP address for that one is computer 2
>| which cannot ping or get on the internet.  Computer 1, which
>| is working fine is not shown.
>
>              The NOSPIN Group is now offering Free PC Tech
>                     support at our newest website:
>                          http://freepctech.com
>
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