[address-policy-wg] Policy proposal: #gamma IPv6 InitialAllocation Criteria
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Daniel Roesen
dr at cluenet.de
Sun Apr 24 13:34:57 CEST 2005
On Sun, Apr 24, 2005 at 11:26:12AM +0200, Iljitsch van Beijnum wrote: > At the end of the day, it's individual ISPs who decide what they > allow and don't allow in their routing tables. It's true that if you > announce a smaller block than a /32 you'll be filtered in many > places. However, this isn't necessarily a problem. For instance, if > someone in Asia sends your customer who has a /48 from you and also > announces this /48 to another ISP, and the Asian network filters the / > 48, the packet will flow towards Europe as per your /32. Then when it > gets to Europe, it's pretty likely that the packet will hit an ISP > who actually has the /48 in their routing table. After all, what's > allowing a few /48s from the people you get drunk with at all those > RIPE meetings? The filtering out there IS a problem. For an example what happens when you try multihoming with </32, see: http://www.sixxs.net/tools/grh/lg/?prefix=2001:1578::/32 It's not that extreme in this case, as some/many people seem to filter "<=/48" instead of ">/32" and /40s do pass, but in general your AS_PATHs for the more-specifics can get VERY long. So borderline is that you have worse to MUCH worse connectivity by announcing the more-specific than via the aggregate, thanks to the filtering done out there. Regards, Daniel -- CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0
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