Further Readings

• The The Linux Networking Overview HOWTO
• The Ethernet HOWTO
• IPchains Firewalling made Easy!
• Linux Network Address Translation
• The Net-HOWTO
• The NET-PPP HOWTO
• Software to build secure VPNs across public networks
• GFCC a GTK+ Firewall Control Center
• This is a port forwarding proxy for ICQ clients, allowing direct connection (chat, file transfer) from behind a firewall. (My wife gave me hell untill I found this.)
• This site describes how to see an IPSec or PPTP VPN host (client or server) behind a Linux masquerading firewall.
• rc.firewall is an ipchains-based firewall script with extensive support for network services (including NFS, IPSec VPNs, Proxies, etc.), masquerading, port forwarding, and IP accounting. Protections include spoofing, stuffed routing/masqerading, DoS, smurf attacks, outgoing port scans, and much more. Multiple private and public interfaces are also supported.
• The best proxy server bar none.
• An oldie but a goodie. Find the latest version of the socks proxy here