On Thu, 31 Oct 2002, Hesham Soliman (EAB) wrote:
> => Pekka, if all the ISP's between the client in your 
> picture and the detination are stupid enough 
> to not ingress filter the SL source, 

Why should they care about it _at all_?

The only one who _should_ be doing it (but for different purposes) is the
attacker's ISP, when performing ingress filtering. But seeing the lack of
ingress filtering today with IPv4 doesn't really make me believe the
situation would be much better with IPv6.

> AND the end site is 
> equally as incompetent, then yes, your client will
> get there. [...]

The destination site is naturally at fault here -- they should have done 
it, but perhaps they didn't think it was necessary (after all, all 
site-local traffic is /dev/null'ed at their border router), or forgot to 
do it.  Happens all the time.
 
> I'm sorry but I don't see this as a realistic or serious 
> issue. 

Difference in what people expect to get done with site-locals is a serious 
issue.

-- 
Pekka Savola                 "Tell me of difficulties surmounted,
Netcore Oy                   not those you stumble over and fall"
Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords

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