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What is the Best Firewall for Servers?

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I maintain a bunch of servers at our labs in the university. Of late, the number of attacks on the computers has been more noticeable. The university provides firewall software (Kerio) but that doesn't work with Win 2003. And so we keep getting hit by zombie machines taken over in the Education Department or from Liberal Arts. So what does the Slashdot crowd use when they need to secure their Linux and Windows servers? Does it cost less than US $100?

Endian Firewall

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Endian Firewall is a turn-key Linux security distribution based on IPCop that turns a system into a security appliance. The features include a stateful packet inspection firewall, application-level proxies for various protocols (HTTP, POP3, SMTP) with anti-virus support, virus and spam filtering for E-mail traffic (POP and SMTP), content filtering of Web traffic and VPN (based on OpenVPN).

Sentry CD - A different firewall approach

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If you want to set up a Linux-based firewall, there's no need to run a bloated distribution that installs everything but the kitchen sink. If you are not afraid to get your hands dirty, and like having total control over your system, then Sentry Firewall CD (SFCD) is just what you need. It is a highly configurable, bootable CD that takes a minimalist approach to firewalling.