Hi, On Wed, Feb 12, 2003 at 04:48:12PM +0100, Francis Dupont wrote:
In your previous mail you wrote:
And at the end, would I be bad if I will use /127 for point-to-point(tunnels).
=> NO! NO!!! If we'd like to save addresses and not give a /64 to a point-to-point link, please don't use a prefix with a length not equal to 64.
We use /124s for tunnels, which avoid the problems from Pekka's draft (anycast), but doesn't waste /64s needlessly. We have a common /64s that is shared between all ptp links, and in the bits "between" the /64 and the /124 boundary, we encode the AS number of the partner, a sequence number, and so on. Best of both worlds.
Simply don't give other addresses than the (mandatory) link-local addresses, a highly reusable /64 prefix which is the equivalent of unnumbered IPv6 point-to-points.
In a dynamically routed backbone, it's very important to actually *see* which ways a packet travels (traceroute), and occasionally to be able to do hop-by-hop diagnostics. All this requires routed ptp addresses, but there is no need for a /64 here. Especially EUI-64 on ptp links is a real nuisance. Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 56029 (55671) SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299