[NBLUG/talk] Linux as router

[Walter Hansen]

I've had good luck using firestarter. You're up and running in about ten
minutes.

> Good morning,
>
>
>
> I have a Linux machine running with two NICs on it (+ the loopback
> interface), which I would like to use as a firewall for my home network.
>
>
>
> I would like to understand a bit more about iptables and wonder if any of
> you could help me.
>
>
>
> In IPTABLES, there are three main queues of packets, namely INPUT, FORWARD
> and OUTPUT.
>
>
>
> I believe:
>
> *	INPUT and OUTPUT exist for both eth0 and eth1, but FORWARD is shared
> between the two.
> *	When testing packets in the INPUT queue, only the input interface
> can be tested for, the output interface won't be set.
> *	When testing packets in the OUTPUT queue, only the output interface
> can be tested for, the input interface won't be set.
> *	Unless "echo 1 > /proc/sys/net/ipv4/ip_forward" is executed, packets
> will not be forwarded from one interface to the other.
>
>
>
> One more related question:
>
> *	Does TCPDUMP show only arriving packets or does it also show packets
> being emitted from the interface being watched? Maybe I am using the wrong
> tool to watched the traffic go by.
>
>
>
> Thank you so much,
>
>
>
> Osiris Pedroso
>
> --
>
> Ph: (707) 658-3500
>
> AOL AIM: osirisPedroso
>
> http://www.SWoptimizer.com <http://www.swoptimizer.com/>
>
>
>
>
>
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