Julien Vehent on 11 Dec 2010 06:08:54 -0800

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[PLUG] Comcast Cable modem & DHCP

Hello Plug,

I just arrived in Philly (and thus joined the plug mailing list) and I'm discovering comcast cable equipment (big motorola modem with one ethernet plug).

I would like to replace the old linksys we are using in the house with a Debian box connected to the modem (I want netfilter and traffic control).
The linksys is getting it's IP in DHCP mode already. From what I see, the lease is 3 days long.

I thought a simple "dhclient eth1", the interface where the cable modem is plugged in, would do the job, but it seems that it's refusing to give my Debian a lease...

Here and there I read that a specific hostname should be provided by the client, but AFAIK there is no such setting on the actual linksys.

I'm from france, and never used comcast or a motorola cable modem before. This one is pretty old (I'd say 2004/2005) but still working fine so replacing it is not an option. Also, I sniffed the DORA from the linksys to the modem and didn't find anything specific in the packets.

So, I seek for your help. Is there any comcast black magic ritual necessary to make this work ? Anybody using a linux box behind a cable modem with dhcp ?


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