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Open source security tools

Security expert James Turnbull gives an example of how open source security tools can be used to create intricate security setups.

Is it possible to use open source products to create firewalls, DMZs and terminate VPN tunnels?

By using a number of open source Linux or BSD distributions, it is possible to create complicated firewall and DMZ environments. In some small- to medium-sized installations, there are products like Shorewall that support firewalling and VPN termination.

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