Date: Mon, 21 Aug 2006 12:48:06 GMT From: Alexander Shkurko <read@midland.com.ua> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/102344: Some packets do not pass through network interface Message-ID: <200608211248.k7LCm6Gj036510@www.freebsd.org> Resent-Message-ID: <200608211250.k7LCoFZa022487@freefall.freebsd.org>
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>Number: 102344 >Category: kern >Synopsis: Some packets do not pass through network interface >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Aug 21 12:50:14 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Alexander Shkurko >Release: FreeBSD 6.1 >Organization: >Environment: testfree# uname -a testfree# uname -a FreeBSD testfree.trade.dom 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Mon Aug 21 15:11:29 EEST 2006 andrew@testfree.trade.dom:/usr/src/sys/i386/compile/black i386 >Description: Packets of some size do not pass through network interface. After some experiment's i found size of ICMP packet's that do not pass. Size of payload, range 1473 bytes - 1479 bytes 2953 bytes - 2959 bytes 4433 bytes - 4439 bytes 5913 bytes - 5919 bytes So, we have formula of size of problem payloads: 1473+x*1480 - 1479+x*1480, where x=1,2,3,4,5,6... I have kernel: testfree# diff -u /usr/src/sys/i386/conf/GENERIC /usr/src/sys/i386/conf/black --- /usr/src/sys/i386/conf/GENERIC Mon May 1 03:15:12 2006 +++ /usr/src/sys/i386/conf/black Mon Aug 21 14:52:37 2006 @@ -279,3 +279,6 @@ device firewire # FireWire bus code device sbp # SCSI over FireWire (Requires scbus and da) device fwe # Ethernet over FireWire (non-standard!) + +options IPFILTER >How-To-Repeat: Add to "generic" kernel support of IPFILTER,install this kernel,reboot, and ping any IP address with payload of 1475 bytes: ping -s 1475 any_ip_address >Fix: Disable support of IPFILTER and problem disappear. >Release-Note: >Audit-Trail: >Unformatted:
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