router/nat with only one NIC

[David A. Bandel]

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On Wed, 08 Sep 2004 09:21:14 -0400
Tim Wunder <tim at thewunders.org> wrote:

> Is it possible to route internal internet traffic through a server
> that has only one NIC?
> 
> I've only had one PC connected to the internet for quite some time and
> 
> have it configured to route all internet traffic through squid, 
> squidguard and dansguardian. I want to add a second PC and have its 
> internet traffic routed the same way. The server that runs squid and 
> dansguardian currently has only one NIC. So far, the information I've 
> found on the 'net through googling indicates that I need to have a 
> second NIC in order to do this.
> 
> Is there a way to do it without adding a second NIC?

Yes, just get a second IP from your provider (and configure the first
server as your proxy) or:

ifconfig eth0:1 192.168.31.1
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv4/conf/eth0/send_redirect
add any firewall stuff you want, plus you'll need:
iptables -t nat -I POSTROUTING -s 192.168.31.0/24 -j SNAT --to-source
xxx.xxx.xxx.xxx

> 
> I know... NICs are cheap, just buy a second one. It'll just be a pain
> to have to pull the server out from where it is, then install and
> configure a NIC. I'm trying to avoid that.
> 
> Thanks,
> Tim

Ciao,

David A. Bandel
- -- 
Focus on the dream, not the competition.
		Nemesis Racing Team motto
GPG key autoresponder:  mailto:david_key at pananix.com
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