>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 [email protected]:/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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