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RE: [tcpm] Re: WGLC on antispoof -- ICMP filtering speculation

Subject: RE: [tcpm] Re: WGLC on antispoof -- ICMP filtering speculation
From: "Templin, Fred L"
Date: Tue, 30 May 2006 13:16:22 -0700
Joe,

>> Thus, I don't understand how can you take that as a recommendation
for
>> ICMP filtering.
>
> The recommendation is that if you don't trust ICMP, filter it out
> entirely. The recommendation comes with the caveat that if you want to
> be responsive, you need to accept unauthenticated ICMPs since there is
> no way to authenticate them sufficiently. It's a choice that's up to
you
> - but if you don't trust ICMP, the choice is very clear.

My only comment here is that things in our imperfect world
are very rarely black-and-white; they are almost always
shades of gray...

Fred
fred.l.templin@xxxxxxxxxx


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