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Help-Net Security: Start your day with a cup of DoS

Apr 28, 2001, 17:00 (1 Talkback[s])
(Other stories by Aleksandar Stancin)

[ Thanks to LogError for this link. ]

"...With linux in specific, a number of things can be done to protect your server from a DoS attack. Use firewalling, filter all incoming TCP, UDP, PING traffic. Packet filtering sometimes can be your best defense against a DoS. If you're running the 2.2.x kernel series get acquainted with 'ipchains' by reading some material on it, perhaps 'man ipchains' for starters, more info can be found in any ipchains HOWTO, and one of them is located here. On the other hand, if you're running the 2.4.x series, you'll probably want to use 'iptables'. But, before you implement it, be sure to get the latest patch for the recently discovered vulnerabiltiy in iptables. More info on iptables can be found here and if you'd like to know more about the vulnerability feel free to read it."

"On the other hand, again, by disabling all unnecessary services you achive some bonus time for your server. A succesfull DoS is only telling you that you need to secure your servers better."

"Running a firewall, third party supplied, is also a good idea, as it is time saving. You could create your own and rely on it but I think of it as a bad idea, as there are more qualified people and companies devoted to making firewalls."

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