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Date:      Sun, 01 Jul 2018 05:38:16 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 229432] 11.2 network em driver - connection link flaps
Message-ID:  <bug-229432-7501-wGEwIMGT83@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-229432-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-229432-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D229432

Eugene Grosbein <eugen@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Open
           Hardware|i386                        |Any
                 CC|                            |eugen@freebsd.org

--- Comment #3 from Eugene Grosbein <eugen@freebsd.org> ---
This is known problem with recent changes in our dhclient and its combinati=
on
with some DHCP servers and em(4) NICs that drop link when driver setups MTU=
 on
the interface. And dhclient now may setup MTU on the interface if DHCP serv=
er
offers DHCP option 26 (it did not before).

As workaround, you can try to add to /etc/dhclient.conf:

interface "em0" {
  supersede interface-mtu 0;
}

This works for me as 0 is special value meaning that dhclient should not ev=
en
try to change interface MTU, as it did before.

--=20
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