comcast problem



This is not a Linux specific problem but I was hoping people with Comcast
experience could suggest some ideas...
My brother has had a working Comcast highspeed cable modem internet
service working with his Mac for months and months. Now it's not working
and I took a Linux system over (also win2k) to try to help diagnose the
problem.
In Linux the symptoms are these (and as far as I can tell, it's the same
with winblows). System set to dhcp (which i know works because I tested it
in my home network before schlepping it over), Linux gets an IP address
(69.something.something.something) it appears to get (according to 'route
-n') a default GW, and it gets 2 ISP provided nameservers, too. But no
pinging is possible. Not Comcast nameservers, not default GW address,
nothing. Switching ethernet cables, resetting modem, powercycling modem
makes no difference.

I know nothing about Comcast service
setup--nothing about what ethernet cables should be used between
"Scientific Atlanta" modem and NIC. I am assured that no special login
software is needed. According to tech support, says my brother, "Anybody
with a laptop should be able to come over, plug in and surf through the
modem." What should I be looking at?

--
Get Big Brother out of my email to reply.
.



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