Linux Firewall

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My boss has just given me a nice little job. At the moment we run an all singing all dancing firewall that sits there and does it al for us. We don't however have any backup procedures for it in case it pops it's clogs. He wants me to have a look at running a linux box using IPTables. Never mind having never used linux, IPtables????

No seriously, got a Red Hat 9 box with a lot of documentation on to read all about iptables and routing. Gonna put 3 NIC's into the box for the green,orange and red interfaces.

Anyone got any suggestions for the linux newbie here

I would appriciate ANY help or pointers in the right direction

 

Tried smoothwall and ipcop. They were ok but had one big drawback. Being a school we have to monitor everything that the kids look at and the firewall is set up so that it blocks port 80 and then sends that through to the proxy server. There just did not seem to be a way to monitor traffic going out and then redirect it. It seems that it accepts that trafic going externally is be default OK and sends it through. If we can't do that then the kids will be able to by pass the proxy server and it's hello porn city.

 

Just reading now thanks Sandy.