[svlug] using Comcast modem and a Linksys router?

[John Conover]

Tom Melendez writes:
> 
> - You already tried powering down the modem, imagine.  With a cable
> modem, you generally have to power it off and on for it to recognize a
> new MAC address.
> - Comcast does DSL?  Didn't know that or is that a typo?
> - Is the modem itself a router?  Some DSL modems are.
> - some DSL modems actually have a web server/configuration utility
> built in (even if they are not routers).  What kind of modem is it
> (make and model) and can you get into this utility?
> - what kind of router do you have?  If you plug in the modem to the
> WAN port and connect a box to the router, with the router's config
> utility you can see if it is pulling an IP address from the modem.
>

If he points his browser at http://192.168.100.1/ from the LAN side of
the modem, he should end up with a diagnostic login for the modem,
(some manufacturers use a different IP, but most use the 192.168
private network IP address-the manufacturer's site will have that
information.) Some of the modems have a special account/password that
is the same for all modems made by a manufacturer-and is available on
their Internet site, too, or from Comcast.

But if the modem won't connect, then there is probably no route, so he
may not be able to see it.

    John

BTW, if the "Data" light on the modem is flashing, (there should be
three lights on all the time, and one flashing all the time,) then the
modem is connected to Comcast, (at least on most of the Cable modems.)

If that's the case, then it would probably be best to look into the
DNS, (and make sure that the attached PC is expecting DHCP, or
something is serving static IP addresses on the LAN/NAT side,) unless
the modem's MAC has not been registered.

-- 

John Conover, conover at rahul.net, http://www.johncon.com/