from pf faq --- http://www.openbsd.org/faq/pf/filter.html#pass quote: " One will sometimes hear it said that, "One can not create state with UDP as UDP is a stateless protocol!" While it is true that a UDP communication session does not have any concept of state (an explicit start and stop of communications), this does not have any impact on PF's ability to create state for a UDP session. In the case of protocols without "start" and "end" packets, PF simply keeps track of how long it has been since a matching packet has gone through. If the timeout is reached, the state is cleared. The timeout values can be set in the options<http://www.openbsd.org/faq/pf/options.html>section of the pf.conf file."
On Wed, May 7, 2008 at 11:56 PM, Kevin K <[EMAIL PROTECTED]> wrote: > You cannot track state of stateless protocols such as UDP. > > > > > -----Original Message----- > > From: Ansar Mohammed [mailto:[EMAIL PROTECTED] > > Sent: Wednesday, May 07, 2008 4:54 PM > > To: 'Jille' > > Cc: 'Kevin K'; freebsd-pf@freebsd.org > > Subject: RE: UDP weirdness > > > > But I thought pf would be tracking state? > > Isnt that the whole point of statefull firewalls? > > > > > > > > > -----Original Message----- > > > From: Jille [mailto:[EMAIL PROTECTED] > > > Sent: May 7, 2008 4:50 PM > > > To: Ansar Mohammed > > > Cc: 'Kevin K'; freebsd-pf@freebsd.org > > > Subject: Re: UDP weirdness > > > > > > > > > > > > Ansar Mohammed schreef: > > > > Ok, so adding the line as you suggested worked. > > > > Thanks Kevin. > > > > > > > > But why do I need to have both entries in for > > > > > > > > pass in proto udp from any to any port 53 > > > > pass out proto udp from any to any port 53 > > > > > > > > what makes UDP so special? > > > UDP is stateless, > > > With TCP you've got an connection (identified by: local host:port and > > > remote host:port) > > > With UDP, well, you just trow the packages over the line, and hope > > the > > > is (still) someone on the other end. > > > > > > So the is (almost) no way to detect whether packets are responses to > > > eachother > > > > > > -- Jille > > _______________________________________________ > freebsd-pf@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-pf > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > -- Kind Regards, Valentin Bud www.syk.ro www.spreadbsd.org/aff/86/1 www.spreadbsd.org/aff/86/2 valentin [dot] bud [at] gmail [dot] com valentin [dot] bud [at] dep [dot] upt [dot] ro _______________________________________________ freebsd-pf@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-pf To unsubscribe, send any mail to "[EMAIL PROTECTED]"
