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Date:      Thu, 22 Mar 2001 17:31:57 -0300
From:      Rodrigo Campos <rodrigo@MATRIX.COM.BR>
To:        Ilya Martynov <m_ilya@agava.com>
Cc:        Chris Byrnes <chris@jeah.net>, freebsd-security@FreeBSD.ORG
Subject:   Re: DoS attack - advice needed
Message-ID:  <20010322173157.C5678@x-ray.matrix.com.br>
In-Reply-To: <86snk5pudk.fsf@juil.domain>; from m_ilya@agava.com on Thu, Mar 22, 2001 at 08:48:39PM %2B0300
References:  <Pine.BSF.4.33.0103221137280.10860-100000@awww.jeah.net> <86snk5pudk.fsf@juil.domain>

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On Thu, Mar 22, 2001 at 08:48:39PM +0300, Ilya Martynov wrote:
> >>>>> "CB" == Chris Byrnes <chris@jeah.net> writes:
> 
>     >> ping uses type 0 and 8
>     >> 
>     >> traceroute uses 11
> 
>     CB> Who needs it.
> 
> Who knows? Probably nobody :)

That's not true at all. Filtering all ICMP traffic can result in
very odd connectivity problems due to Path MTU discovery issues.

There's a very good white paper about it that can be found at
http://www.worldgate.com/~marcs/mtu/

Regards,

-- 
Rodrigo Campos
Matrix Internet S.A. - NOC

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