asymmetric routing

[JOIN Project Team]

Am Sonntag, 27. Januar 2002 18:06 schrieb Francis Dupont:
> Basically RFC 2827 / BCP 38 about Ingress Filtering should be used
> for IPv6 too. There are two ways to do ingress filtering: access lists
> and unicast RPF.

I don't think it's that easy. Please keep in mind, that a site/customer
might be multihomed. In that case he might use a different prefix from that 
assigned by the upstream provider as source address. 

Yes, one could filter all but those prefixes a customer holds, but then the
customer has to name all his providers/prefixes. You can't force a customer
to do so, because that information might be confidential.

Christian

-- 
JOIN - IP Version 6 in the WiN  Christian Schild
                 A DFN project  Westfaelische Wilhelms-Universitaet Muenster
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