On Wed, 14 Nov 2012, james woodyatt wrote:
Maybe I'm missing something, but I think this is really an intractable problem, given what I know about it.
Having outgoing packets from ALFA prefix go out to ALFA and BRAVO prefix to go out via BRAVO has been on the problem description for over a year (afaik), so I can't imagine people aren't looking into that already.
It's not solved by ISPs coordinating, that's never going to happen. I've always seen it to be solved via some kind of source based routing automatically discovered between the ISP routers. I believe this is in the suggestions already. uRPF is well known problem that needs to be handled.
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