Date: Thu, 15 May 2008 12:08:28 +1200 From: "Mark Pagulayan" <m.pagulayan@auckland.ac.nz> To: "Tom Uffner" <tom@uffner.com>, "Kian Mohageri" <kian.mohageri@gmail.com> Cc: freebsd-pf@freebsd.org Subject: RE: FreeBSD PF 4.1 Inserts Flags S/SA Automatically to rules Message-ID: <C65291A68BAF57499B18564A1EE4A761370E53@UXCHANGE1.UoA.auckland.ac.nz> In-Reply-To: <482B7BE6.9080608@uffner.com> References: <C65291A68BAF57499B18564A1EE4A761370E38@UXCHANGE1.UoA.auckland.ac.nz> <fee88ee40805141613k685c1536w9fc72e88aaa9f746@mail.gmail.com> <482B7BE6.9080608@uffner.com>
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Hi Tom, I have just zeroed in the statistics and yes the state-mismatch is still increasing. If I do enable logging, how would I know that packet is mismatched? Cheers, Mark -----Original Message----- From: Tom Uffner [mailto:tom@uffner.com] Sent: Thursday, 15 May 2008 11:55 a.m. To: Kian Mohageri Cc: Mark Pagulayan; freebsd-pf@freebsd.org Subject: Re: FreeBSD PF 4.1 Inserts Flags S/SA Automatically to rules Kian Mohageri wrote: > On Wed, May 14, 2008 at 3:45 PM, Mark Pagulayan >> The way I see this is that this rule would be applied to udp traffic as >> well which will be dropped/blocked because flags only work for tcp and >> this might be the cause of state-mismatches that I see in the table - > > 'flags S/SA keep state' will work OK for UDP too. Only the 'keep > state' part will be applied to UDP, since no flags are involved. > >> state-mismatch 11577272 48.7/s > > Could be caused by reloading your ruleset to include 'keep state' > mid-connections, I think. PF won't be aware of where the state is > (especially true if you're using TCP window scaling), so it will fail > after a while and you'll see state mismatches. even if reloading the ruleset to include "keep state" and/or "flags s/sa" didn't sever pre-existing connections, it shouldn't cause that large a number of mismatches. when was the last time you zeroed the statistics? is the mismatch count still increasing w/ the 7.0 stateful rules? you may need to add "log (all)" to find out where the state mismatches are coming from.help
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