| Carl Johnson on 11 Dec 2010 06:37:10 -0800 |
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| Re: [PLUG] Comcast Cable modem & DHCP |
Looks to me like you're plugging into a router already. Sent from my Motorola DynaTAC 8000x. "Casey Bralla" <MailList@nerdworld.org> wrote: > >I am doing something very similar on my comcast commercial account. I >plug a >Debian computer into one of the network ports on the comcast modem and >use >this as a firewall and router to my DMZ and internal network. > >Originally, I had allowed the modem to assign an address with dhcp, but >l then >switched to setting the IP statically (I don't remember why). I assign > >10.1.10.2 to the interface on my Firewall box, with a gateway of >10.1.10.1. I >also use the comcast modem as a DNS server (10.1.10.1). > >I then use Shorewall as my firewall, which routes packets to 2 other >network >interfaces on my firewall box. > >My /etc/network/interfaces file is: > ># This file describes the network interfaces available on your system ># and how to activate them. For more information, see interfaces(5). > ># The loopback network interface >auto lo >iface lo inet loopback > ># The primary network interface ># allow-hotplug eth0 ># auto eth0 ># iface eth0 inet dhcp > > >auto eth1 >iface eth1 inet static > address 192.168.2.1 > netmask 255.255.255.0 > broadcast 192.168.2.255 >auto eth2 >iface eth2 inet static > address 192.168.1.1 > netmask 255.255.255.0 > broadcast 192.168.1.255 > >auto eth0 >iface eth0 inet static > address 10.1.10.2 > netmask 255.255.255.0 > broadcast 10.1.10.255 > gateway 10.1.10.1 > >(Note the commenting out of the dhcp lines.. wish I remember why I did >this) > > > >Hope this helps and welcome to the USA! > > > > > > > >On Saturday 11 December 2010 9:08:44 am Julien Vehent wrote: >> 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 ? >> >> Thanks, >> Julien >> >> >___________________________________________________________________________ >> Philadelphia Linux Users Group -- >http://www.phillylinux.org >> Announcements - >http://lists.phillylinux.org/mailman/listinfo/plug-announce >> General Discussion -- >http://lists.phillylinux.org/mailman/listinfo/plug > >-- > >Casey Bralla >Chief Nerd in Residence >The NerdWorld Organisation >http://www.NerdWorld.org >___________________________________________________________________________ >Philadelphia Linux Users Group -- >http://www.phillylinux.org >Announcements - >http://lists.phillylinux.org/mailman/listinfo/plug-announce >General Discussion -- >http://lists.phillylinux.org/mailman/listinfo/plug ___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug