Date: Fri, 18 May 2007 19:54:19 +0300 From: "Abdullah Ibn Hamad Al-Marri" <almarrie@gmail.com> To: "Kian Mohageri" <kian.mohageri@gmail.com> Cc: Volker <volker@vwsoft.com>, freebsd-pf@freebsd.org Subject: Re: Best way to decrease DDoS with pf. Message-ID: <499c70c0705180954y2dcd150cpbe8978ee3547a35c@mail.gmail.com> In-Reply-To: <fee88ee40705180905q1017378ak588a2919dbec328b@mail.gmail.com> References: <464D6880.2080306@vwsoft.com> <499c70c0705180656l4f601c1av45b6f9989792ccf1@mail.gmail.com> <fee88ee40705180905q1017378ak588a2919dbec328b@mail.gmail.com>
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On 5/18/07, Kian Mohageri <kian.mohageri@gmail.com> wrote: > On 5/18/07, Abdullah Ibn Hamad Al-Marri <almarrie@gmail.com> wrote: > > Thank you for the tip. > > > > Here what I'm using which fixed the issue. > > > > pass in on $ext_if proto tcp from any to $ext_if port $tcp_services > > flags S/SA synproxy state > > pass in on $ext_if proto tcp from any to $ext_if port $tcp_services \ > > flags S/SA keep state \ > > (max-src-conn 30, max-src-conn-rate 30/3, \ > > overload <bruteforce> flush global) > > pass out proto tcp to any keep state > > > > Comments? > > The first rule won't match anything (same criteria as second rule, and > last match wins with pf). On the third rule, use 'flags S/SA' unless > you have a good reason not to. > > Kian > I thought first rule will defeat syn flood. Is the second rule going to do the same job as first rule and will prevent syn flood? As for the third rule syntax, Should I make it like this? "pass out proto tcp to any flags S/SA keep state" and shall I add the same for udp? "pass out proto udp to any flags S/SA keep state" ? -- Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/
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