setup linux gateway + firewall (redhat 9.0)

[mirt]

Hello, I need to setup a linux gateway for a lan-party. Offcourse we need to use Iptables.
More details:
we have 3 ranges : 192.168.1.0/16 (Servers) , 192.168.2.0/16 (admins), 192.168.3.0/16(gamers)

Server range : 6000:7000 tcp closed
Admin range : all open
Gamers range: all closed accept 5190tcp,4000tcp

For each user we have to know the amount of datatransfer. (just need to be shown on the screen, nothing advanced)

Are there people who can help me?

Thx a lot !!

[nikolei]

hi

network 1 (servers): 192.168.1.0/24
network 2 (admins): 192.168.2.0/24
network 3 (gamers): 192.168.3.0/24

gateway has 3 nics with ipadresses (for example): 192.168.1.1, 192.168.2.1, 192.168.1.3

1) you have to set the routes to all networks for all machines. gateway adress is always the ip adress of the gateway within the subnet.

2) compile iptables and routing into the kernel

3) aktivate routing with:
echo "1" > /proc/sys/net/ipv4/ip_forward

4) tell your filewall to forward packages:
iptables -A FORWARD -j ACCEPT

5) configure your firewall filtes as you need them

thats all

the data transfer per user is easy to get if you do it on a per ip adress basis.
just ask google or freshmeat. there are a lot of programs around, that can do the job.

or if you like writing, you can implement one firewall rule perl user/ip-adress and wath the traffic via:
iptables -L -v

but after a limit of bytes trasfered, netfilter will reset the counter, so it it not very suited for a lan party.

nikolei