Date: Sun, 26 Jun 2011 19:27:41 +1000 (EST) From: Mark Andrews <marka@isc.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/158307: ipv6_pktinfo breaks IPV6_USE_MIN_MTU Message-ID: <201106260927.p5Q9RfOw010157@sex.dv.isc.org> Resent-Message-ID: <201106260940.p5Q9e2mt035510@freefall.freebsd.org>
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>Number: 158307 >Category: kern >Synopsis: ipv6_pktinfo breaks IPV6_USE_MIN_MTU >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Jun 26 09:40:01 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Mark Andrews >Release: FreeBSD 8.2-STABLE i386 >Organization: ISC >Environment: System: FreeBSD sex.dv.isc.org 8.2-STABLE FreeBSD 8.2-STABLE #10: Sat Feb 26 18:02:12 EST 2011 marka@sex.dv.isc.org:/usr/obj/usr/src/sys/DEBUG i386 >Description: If IPV6_PKTINFO is set as a control with sendmsg() then IPV6_USE_MIN_MTU state set by setsockopt() is ignored. >How-To-Repeat: Run named and look at any IPv6 UDP response > 1280 bytes. These are all supposed to be fragmented at 1280 as named sets IPV6_USE_MIN_MTU to 1 on all IPv6 UDP sockets. PMTUD really doesn't work well for DNS which is one of the reasons why IPV6_USE_MIN_MTU was defined in the first place. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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