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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next v4 0/3] path mtu hardening patches
Date: Mon, 13 Jan 2014 14:12:55 -0800 (PST)
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From: John Heffner <johnwheffner@gmail.com>
Date: Mon, 13 Jan 2014 16:50:38 -0500

> Perhaps I misunderstood your description of FreeBSD then.  It seems
> hard for me to believe that MTU discovery for UDP is broken by default
> in FreeBSD.  It was not as of a couple years ago...

FreeBSD never implemented PMTU for anything other than TCP.

In fact, outside of Linux and perhaps Solaris, very few networking
stacks have implemented UDP PMTU.