From owner-freebsd-hackers  Fri Jan  4 14:32:43 2002
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Date: Fri, 4 Jan 2002 23:32:35 +0100
From: Guido van Rooij <guido@gvr.org>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: William Carrel <william.carrel@infospace.com>,
	freebsd-hackers@freebsd.org
Subject: Re: path_mtu_discovery
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References: <26E71536-013D-11D6-8ED3-003065D5E9A4@infospace.com> <3C36149B.B9C02DCF@mindspring.com>
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On Fri, Jan 04, 2002 at 12:46:19PM -0800, Terry Lambert wrote:
> William Carrel wrote:
> > Blocking all ICMP is bad m'kay?
> 
> First, I agree...
> 
> > ipfilter with 'keep state' on the connections will automatically allow
> > back in relevant ICMP messages such as mustfrag.
> 
> Heh... I need to try to write a "mustfrag" daemon, which will
> spoof them back whenever it sees traffic... and see what happens.
> 

The sender will start sending smaller segments. That's it.
But if you are in the patch between sender and receiver you can do worse
things than that.

-Guido

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