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To: net@FreeBSD.org
Subject: [Bug 229432] 11.2 network em driver - connection link flaps
Date: Sun, 01 Jul 2018 05:38:16 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 11.2-RELEASE
X-Bugzilla-Keywords: IntelNetworking, regression
X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: eugen@freebsd.org
X-Bugzilla-Status: Open
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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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