On 17-Feb-2006, at 16:24, Fred Baker wrote:
To figure out the radix model, you basically observe the prefix
lengths in your own configuration and being advertised to you. From
http://www.ripe.net/ripe/docs/ipv6policy.html#initial_allocation, I
observe that you are likely to receive advertisements of:
/32 prefixes for remote ISPs
/48 (and /56?) prefixes for customers of your own ISP
... and also /48s advertised by ASes who qualify for long-prefix PI
assignments from the various RIRs (e.g. under critical infrastructure
policies; F-Root is numbered within 2001:500::/48.)
/64 prefixes for some customers of your ISP and LANs in your own
network
/128 prefixes of some individual systems
[...]
In fact, I could think of a lot of things. Which is why you don't
want to build the magic numbers in as compile options or hardware
offsets, but rather learn them from the route database actually
advertised to you.
I think also it's good advice not to assume that what you see on the
v6 Internet today is any indication of what you might see in (say) 5
years time. RIR assignment policies change; as/if substantial
commercial/production traffic moves to v6, that will cause additional
pressures.
Joe
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