[Bug 229432] 11.2 network em driver - connection link flaps

[bugzilla-noreply at freebsd.org]

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

Eugene Grosbein <eugen at freebsd.org> changed:

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

--- Comment #3 from Eugene Grosbein <eugen at freebsd.org> ---
This is known problem with recent changes in our dhclient and its combination
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 server
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 even
try to change interface MTU, as it did before.

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