[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 #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: eugen
Date: Wed Jul 11 09:41:50 UTC 2018
New revision: 336195
URL: https://svnweb.freebsd.org/changeset/base/336195

Log:
  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).

  N.B.: obsolete u_int16_t is used in consistency with the rest of the file.

  PR:           229432
  Approved by:  mav (mentor)
  MFC after:    1 week

Changes:
  head/sbin/dhclient/dispatch.c

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