Date: Sun, 21 Apr 2013 20:59:31 +0700 From: Eugene Grosbein <egrosbein@rdtc.ru> To: Marcelo Gondim <gondim@bsdinfo.com.br> Cc: freebsd-stable@freebsd.org Subject: Re: Possible DoS in mpd 5.6 pppoe server Message-ID: <5173F0C3.2040102@rdtc.ru> In-Reply-To: <51731FFE.5020304@bsdinfo.com.br> References: <5172965A.9080600@bsdinfo.com.br> <5172BDDD.4010509@rdtc.ru> <5172CFB2.3010708@bsdinfo.com.br> <5172D14D.8040009@rdtc.ru> <51731FFE.5020304@bsdinfo.com.br>
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On 21.04.2013 06:08, Marcelo Gondim wrote: > Em 20/04/13 14:33, Eugene Grosbein escreveu: >> On 21.04.2013 00:26, Marcelo Gondim wrote: >> >>>> You seem to use dummynet and the problem is not in mpd/pppoe code, >>>> it's it the dummynet code. Look at http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/162558 >>>> for workarounds. >>> Ok :) I will try this: >>> >>> - net.isr.bindthreads=1 in /boot/loader.conf; >>> - net.isr.direct=1 and net.isr.direct_force=1 in /etc/sysctl.conf >> For 9.x and newer, net.isr.XXX knobs names have changed but defaults are fine - >> if you have not messed them, you should be OK. >> >> >> > Eugene, > > Does FreeBSD 8.3-STABLEis best for this use or this problem also occurs > in 8.x? I have not tried anything newer than 8.x for this task yet. With noted tuning, this problem within dummynet occurs very seldom for me. I had about two or three panics for many months. Another one described here: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/171711 Perhaps, using ng_car would be even more stable, I have not tried it. Eugene Grosbein
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