K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2020-04-14T16:35:05.351367Z
K 7
svn:log
V 531
Improve the TCP blackhole detection. The principle is to reduce the
MSS in two steps and try each candidate two times. However, if two
candidates are the same (which is the case in TCP/IPv6), this candidate
was tested four times. This patch ensures that each candidate actually
reduced the MSS and is only tested 2 times. This reduces the time window
of missclassifying a temporary outage as an MTU issue.

Reviewed by:		jtl
MFC after:		1 week
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D24308

END