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Date: Wed, 13 Feb 2013 18:04:33 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
Subject: Re: FreeBSD DDoS protection
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Cc: Janne Snabb <snabb@epipe.com>, khatfield@socllc.net,
 Mark Felder <feld@feld.me>, freebsd-isp@freebsd.org,
 freebsd-security@freebsd.org, James Howlett <jim.howlett@outlook.com>
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On Wed, 13 Feb 2013 01:52:29 +0100, Dag-Erling Smørgrav wrote:
 > Mark Felder <feld@feld.me> writes:
 > > Dropping ICMP is not a security method. Please stop doing this!

 > Slight correction: dropping *all* ICMP is a bad idea.  You can get by 
 > with just unreach.  Add timex, echoreq and echorep for troubleshooting.

rc.firewall, phk@? has long recommended 3,4,11 as "essential" icmptypes.  
Are there any negative security implications to including source quench?

 > For IPv6, you want unreach, toobig, neighbrsol and neighbradv.  Add
 > timex, echoreq and echorep for troubleshooting, and routersol and
 > routeradv on networks that use SLAAC.

cheers, Ian
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