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Date: Thu, 1 Dec 2011 22:39:13 -0600 (CST)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
Message-Id: <201112020439.pB24dDA7006102@mail.r-bonomi.com>
To: freebsd-questions@freebsd.org
In-Reply-To: <4ED84BDB.5010908@tundraware.com>
Subject: Re: ipfw And ping
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Tim Daneliuk <tundra@tundraware.com> wrote:
> To: Robert Bonomi <bonomi@mail.r-bonomi.com>
> Subject: Re: ipfw And ping
>
> On 12/01/2011 09:12 PM, Robert Bonomi wrote:
> >>  From tundra@tundraware.com  Thu Dec  1 20:57:55 2011
> >> Date: Thu, 01 Dec 2011 20:56:03 -0600
> >>
> >> Both.
> >
> > Then you want to allow icmp type 0, 3, 8, and 12 -- and type probably 11,
> > too -- both ways.
>
>
> Is there a reason to not use what I have already - i.e., To let all icmp 
> types flow in- and out?   What's the downside of doing so?

Some _can_ be used maliciously. e.g. REDIRECT