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kp
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2015-06-18T20:34:39.255646Z
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Merge r278843, r278858

In the forwarding case refragment the reassembled packets with the same
size as they arrived in. This allows the sender to determine the optimal
fragment size by Path MTU Discovery.

Roughly based on the OpenBSD work by Alexander Bluhm.

Differential Revision:	https://reviews.freebsd.org/D2816
Reviewed by:	gnn

END