One nic transparent proxy

krusty_ar · Posted: Wed Jan 29, 2003 3:00 pm Post subject: One nic transparent proxy

not very gentoo related but...

i got my hands on an old 386 that i want to use as a proxy for a home network, the thing is, i only have one isa nic, now, i use a nic that goes from my box to the router (cisco 677), that works with or without an ip on the nic.

The question is: can i hook all the boxes and the router to a hub, connect to the isp from one of the boxes and use the SAME nic to connect to the LAN??

don't call me cheap, it just poped into my mind :?:

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krusty_ar · Posted: Wed Jan 29, 2003 3:42 pm Post subject:

i think the cisco 677 can act as router, but mi isp disables this as well as the web interface before shiping and i don't have the right cable to access it trough the serial port

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Xan · n00b Joined: 08 Jan 2003 Posts: 45 Location: Austin

I think so. It's possible to assign multiple IP addresses to a network interface, you just refer to it as eth0:1, eth0:2, etc. Configure eth0 to get on the Internet through your router, then assign eth0:1 an internal ip (eg 192.168.0.1). Set up iptables, dhcpd etc to use eth0 as the external interface and eth0:1 as the internal, and your internal machines should use 192.168.0.1 as their default router. I haven't tried it, but it should work.

Xan · n00b Joined: 08 Jan 2003 Posts: 45 Location: Austin

One caveat, it sounds like your router may assign itself an IP in the internal range, and it would be important to avoid any conflict there. Running a traceroute to someplace should tell you the IP of your Cisco; make sure whatever subnet you assign your internal boxes does not encompass the IP of the router. It may be easiest just to pick something in the 10.0.0.0 range if your Cisco is 192.168.0.0, or vice versa.

krusty_ar · Posted: Thu Jan 30, 2003 12:07 pm Post subject:

tx Xan, just one q: i've never done this either so can you point to some docs?
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krusty_ar · Posted: Thu Jan 30, 2003 12:42 pm Post subject:

ok, i did some searching (like i should have done before posting this) and found that it's really simple to do this

here's a post that shows two ways of doing it

Multiple ip on one nic
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