Re: [MLUG - DISCUSSION] IPTABLES - Router help

[George Robb <EMAIL:PROTECTED>]

I was sure someone would beat me to this.

I'm using Gentoo and have a setup darn near identical to this:

http://www.gentoo.org/doc/en/home-router-howto.xml

Only difference is that I'm using it to be a bridge for my wireless  
network in the house to a wired network out in the garage...  (yea,  
yea, I'm lazy for not stringing some cat-5 but, it works and it is a  
P.O.S. laptop that I don't care if it gets destroyed.)  ;)

The iptables instructions are very well written in my opinion take a  
look at code listing 5.2.

Hope this helps,

George




On Mar 5, 2007, at 1:45 PM, Brandon West wrote:

> A re-send. I don't think it went through the first times. Sorry in  
> advance for a duplicate.
>
> I knew how to configure a router via ipchains, but haven't used  
> iptables in the same manner to do this.
>
> This is my setup: eth0 192.168.0.1
> 		  eth1 192.168.1.1
>
> I have comptuers on the "0" subnet as well as the "1" subnet. So I  
> need to get linux to route the packets to/from the client  
> 192.168.1.10 to the server on 192.168.0.10.
>
> For example what I'd do in the past is this:
> ipchains -I forward -j ACCEPT -s 192.168.1.0/24 -d  192.168.0.0/24 -b
>
> That would allow the linux box to then allow data to be moved  
> across the two different subnets.
>
> While this is a simple example of what I need to do, in reality, I  
> have 4 subnets that need to be routed, say 192.168.0.0,  
> 192.168.1.0, 192.168.2.0 and 192.168.3.0.
>
> So my ipchains commands to route this network would be:
> #routes from 0 to 1
> ipchains -I forward -j ACCEPT -s 192.168.0.0/24 -d  192.168.1.0/24 -b
> #routes from 0 to 2
> ipchains -I forward -j ACCEPT -s 192.168.0.0/24 -d  192.168.2.0/24 -b
> #routes from 0 to 3
> ipchains -I forward -j ACCEPT -s 192.168.0.0/24 -d  192.168.3.0/24 -b
> #routes from 1 to 2
> ipchains -I forward -j ACCEPT -s 192.168.1.0/24 -d  192.168.2.0/24 -b
> #routes from 1 to 3
> ipchains -I forward -j ACCEPT -s 192.168.1.0/24 -d  192.168.3.0/24 -b
> #routes from 2 to 3
> ipchains -I forward -j ACCEPT -s 192.168.2.0/24 -d  192.168.3.0/24 -b
>
> Thus the above example allows all the subnets to talk to eachother.
>
> Then back in the day of ipchains I used to setup a script of some  
> sort with the above info in it, so that when you rebooted your  
> router would work. Is there a way to write this to the default  
> table upon boot?
>
>
> Thanks in advance,
>
> Brandon
>
>
> PS, I only need to know how to use iptables in the first example, I  
> can figure out everything else from there.
>
>
>
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