Setting up a box to act as a gateway. {explained}

[Jim6]

I've just set up a box(2) which connects to the net through eth0 (192.168.1.3) to box 1 (192.168.1.1) which acts as box 2's gateway. I want to be able to connect my laptop to eth1 on box(2) using a crossover cable.

How should I go about doing this? What kind of ip address range should I assign the laptop and eth1? What do I have to do with regard to routing tables with regards to gatways?

Sorry; I don't have much of a clue

[Voorhees51]

Just a thought.

If you happen to have an extra hub or switch around, you could set the gateway box to be a dhcp server for your internal network, then just set your ip range that it serves, and you should be good to go, just set your other computers that are going to connect to it, to get their IP address by DHCP.

[Jim6]

I would, but don't have one. And I can't afford much of anything these days The setup I've outlined makes sense given the layout of the systems in the flat.

So can anyone help me? {even if just to point me in the right directions(s)}

[beandog]

I would emerge dnsmasq -- its the easiest quickest way of setting up a DHCP server I've seen.

Or, instead of using a DHCP server, you could just manually configure net.ethx (the port you share your connection on) and then manually set your IP address on your laptop.

And then, no matter what you choose, make sure you turn on ip forwarding within iptables. If you look at the ebuild or emerge it again, it will say what you need to set in /proc.

That's a very summarized set of basic instructions.
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[Jim6]

... A little too summarised, I'm afraid

I can't be bothered using DHCP; I'd prefer to keep them static. What kind of ip range would suit?

And where should I start with the ip forwarding?

[beandog]

Any ip range is sufficient as long as you don't have it the same as your device connected to the net.

Here's an example -- I have my internet connection which comes in through my router, then goes to my desktop. I get an ip address on my desktop using dhcp on eth0, so eth0 is 192.168.0.1.

I have a second card in my desktop (eth1) that I manually set the ip address to something else, like 192.168.1.1. To do that, I add this line in /etc/conf.d/net:

[Jim6]

Cool - thanks for the pointers.

Found a tutorial on iptables here and now it's all working

Thanks!