[my apologies for burning so much bandwith]
On 8-dec-03, at 22:17, Zefram wrote:
Just wondering, as I have about IPv4 anycast allocations: why can't we
designate a block for microallocations, within which prefix length
filters
aren't applied? The number of routes in the DFZ is the same either
way;
is there any technical reason why /64 or /128 prefixes, or /32 in IPv4,
can't be used? I'm not a routing person, so apologies if this is
somehow
unspeakably dumb.
In RFC 3513 (section 2.6) it more or less says that anycast addresses
must be host addresses and they must be propagated throughout the
region where there are interfaces configured for the anycast address.
So if there are root servers sharing an anycast address all over the
globe, there must be a globally visible /128 for that root server.
So no, this isn't dumb. Also, if anycast addresses are going to come
from micro allocations there is no particular reason to stop at 48
bits. A prefix size that is different from what millions of end users
will be getting might in fact be a plus.