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Using a Linux server as a firewall/router

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linux-howto

http://serverfault.com – I want to configure a dedicated Linux server as a router for protecting dedicated servers with public IPs. I have 6 dedicated servers and I want to add a router/firewall to protect them. I will use another server with two network cards (eth0 and eth1) as a dedicated router. All dedicated servers must have incoming and outgoing Internet access for all ports. How can I configure this to work? example of IPs I have: 172.17.17.1 (local IP for data center router internet/gateway) 172.17.17.2 (local IP for one network card eg. WLAN) 85.172.50.43 (dedicated public IP eg. for LAN) Servers: 85 (HowTos)