[Bug 229432] 11.2 network em driver - connection link flaps with dhclient and option 26 (interface mtu)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229432

--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: eugen
Date: Wed Jul 18 01:57:13 UTC 2018
New revision: 336440
URL: https://svnweb.freebsd.org/changeset/base/336440

Log:
  MFC r336195: unbreak dhclient(8) option 26 processing

    Make dhclient(8) verify if new MTU (option 26) differs from current one
    and skip unneeded MTU change. This check eliminates infinite loop
    of MTU change / link flap / lease verification / MTU change / link flap
etc.
    in case of some NIC drivers like em(4) or igb(4).

  PR:           229432
  Approved by:  mav (mentor)

Changes:
_U  stable/11/
  stable/11/sbin/dhclient/dispatch.c

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