Date: Wed, 16 May 2007 11:21:29 GMT From: Vyacheslav Silakov<seal@inar.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/112708: ipfw is seems to be broken to limit number of connections Message-ID: <200705161121.l4GBLT9e060823@www.freebsd.org> Resent-Message-ID: <200705161130.l4GBU6iC058755@freefall.freebsd.org>
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>Number: 112708 >Category: misc >Synopsis: ipfw is seems to be broken to limit number of connections >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed May 16 11:30:04 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Vyacheslav Silakov >Release: FreeBSD 6.2-STABLE >Organization: JSC Internet-Arkhangelsk >Environment: FreeBSD fw.inar.ru 6.2-STABLE FreeBSD 6.2-STABLE #3: Fri May 11 15:45:11 MSD 2007 seal@fw.inar.ru:/usr/obj/usr/src/sys/FW i386 >Description: IPFW rules: ipfw add allow tcp from me to me 25 ipfw add allow tcp from x.x.x.0/19 to me 25 limit dst-port 100 ipfw add allow tcp from any to me 25 limit dst-port 500 works fine with FreeBSD 4.11-STABLE. However they doesn't work properly after upgrade to 6.2-STABLE. Our mail server is always heavy loaded. When I'm installing this ipfw rules number of sendmail connections is keeping around selected limit (500-600 sendmail processes. ps -ax| grep sendmail | wc). But after 5-10 minutes of runtime number of sendmail processes is going to 25 and server rejects new smtp connections. 'ipfw -f flush' and ipfw reconfiguration makes smtp-server alive for another 5-10 minutes and so on. >How-To-Repeat: >Fix: none >Release-Note: >Audit-Trail: >Unformatted:
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