SSH is one of the most secure communication methods we have. It’s encrypted, and even the passwords can’t be sniffed. But it’s not invincible. Weak passwords can be brute forced and open ports invite automated bots looking for that open port 22. But there’s a number of ways we can harden our ssh server.
Read more »The Ultimate SSH Security Tutorial
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iptables as a replacement for commercial enterprise firewalls
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With IT budgets getting tighter, managers need to trim costs. Service contracts are expensive for any technology; firewalls are no exception. Netfilter, the project that provides the packet filtering program iptables, is a free firewall alternative. While it lacks the service contract of commercial solutions and a pretty interfaces to make firewall modification easy, it has solid performance, performs effectively at firewalling, and allows for add-on functionality to enhance its reporting and response functions.
Read more »Blocking specific network applications with iptables
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Many organizations face a productivity problem with employees who abuse chat programs like MSN Messenger. Some IT departments are instructed to block this kind of traffic for users who either abuse or simply don't require the software.
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