From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v2 nf-next 1/6] net: untangle ip_fragment and bridge
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Date: Tue, 17 Mar 2015 13:12:50 -0400 (EDT)
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From: Florian Westphal <fw@strlen.de>
Date: Tue, 17 Mar 2015 11:11:52 +0100

> And doing route lookups will break things for some people, we have zero
> guarantee that a bridge has the needed routing information,
> its valid to not even configure a default gateway on a bridge.

Then without a proper route you absolutely cannot choose an
appropriate MTU from which to perform fragmentation.

Just accept that basic fact.