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Date: Mon, 19 Sep 2016 13:28:45 -0700 (PDT)
From: Lyndon Nerenberg <lyndon@orthanc.ca>
To: "Dean E. Weimer" <dweimer@dweimer.net>
cc: FreeBSD Stable <freebsd-stable@freebsd.org>
Subject: Re: LAGG and Jumbo Frames
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This is almost certainly a PMTUd issue.

Unless your end-to-end paths to everything you talk to have jumboframes 
configured, there's no benefit to setting them up on the lagg.  Just go 
with the default MTU.

--lyndon