Re: cable modem reset

From: prg (rdgentry1_at_cablelynx.com)
Date: 01/13/05 

Date: 12 Jan 2005 20:44:05 -0800

aq wrote:
> Hey all, I've been running a dual boot FC3 and xp system for quite
some
> time, in fact the only reason i think my xp system has survived for
so
> long is because i don't let xp on the net except to update malware
data
> files, however:
>
> when i enable the network interface in xp and subsequently reboot
into
> linux, the ifup script either fails or gives me a local ip address
> (something like 192.) and my linux system can't get onto the
internet.
> It's pretty annoying and it happens whether i disable the network
device
> under windows before rebooting or not.
>
> If i can catch it early enough in the boot process i can usually pull
the
> power on the modem, forcing it to do a reset. After which it works
but i'm
> beginning to wonder if that's particularly healthy for the modem...
So,
> although i know the fault is probably with windows (i thought maybe
it
> doesn't release the dhcp address too readily) any thoughts on how to
> remedy the situation?

Two vital pieces of info you left out -- like what brand/model (CM/dsl)
modem and the name of your service provider/ISP.

Sounds like your modem is cacheing client identifiers and Windows
usually does it differently from Linux. There are several other
posibilities but hard to guess what without the info.

You can use ethereal to inspect the dhcp packets being passed in a
lease request by running it, then requesting a new lease. Obviously
you can't use it at boot. It runs equally well on XP as Linux and
capture files from one work in the other.

In any case, there is some item that is different in the XP request
from the Linux request, and since unplugging the modem can "work" I
suspect the modem is cacheing this info before it is ever sent
upstream. No way to know without spec sheets/technical manuals or
sniffing the wire.

You might also look here for guidance if it is a provider quirk:
http://www.dslreports.com/

Here is an explanation of client-id differences. Note that some ISPs
will not give out a new lease when quickly changing them -- like
re-booting. Some just give out different IPs.
http://homepage.ntlworld.com/robin.d.h.walker/cmtips/dhcp.html#dhcpmulti
hth,
prg
email above disabled

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