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Bugtraq archives for 2nd quarter (Apr-Jun) 1994: Re: ICMP filtering?

Re: ICMP filtering?

G.J.W. Hagenaars (xx247freenet.carleton.ca)
Thu, 28 Apr 1994 08:45:31 -0400 (EDT) 

% >Is this true?  If so, I'd be interested to know how this is implemented
% >and also what software revision is required.  We use quite a few routers
% >here, some Cisco, some not.  I don't see how one could filter 'fake'
% >icmp destination unreachable messages without actually filtering all
% >real ones as well.
% 
% I believe that a majority of the packets "nuking" connections out there are
% not perfect fakes; they are distinguishable from the real thing.

And how do you spot that which makes them distinguishable from the
real thing?