Thanks for the facts. It does seem like a childhood illness
though - obviously it isn't sustainable as IPv6 grows up.
Brian
On 2007-06-27 16:06, Jeroen Massar wrote:
Brian E Carpenter wrote:
[..]
We can argue about the meaning of "intrinsically" I guess. But what I mean
is that they are /48s and I don't expect to see /48s routed globally.
Quickly checking http://www.sixxs.net/tools/grh/, taking a rather long
raw-dump of it, cut&pasting it into a textfile and doing some shell
magic, I got the following nice prefixes (full list below)
639 32
216 48
32 35
30 40
216 48
1 52
2 56
87 64
3 124
7 126
8 128
I therefor can thus easily conclude that filtering is not happening that
heavily at all. /48's actually will EASILY pass most filters. Most of
the /64's are IX prefixes btw. Until we get certificates in BGP and
until routing strain is not being felt and operators don't want to
filter having a /48 from any block will be easy. Most ISP's do only
accept 2000::/3 indeed though.
Btw, that covered 1088 different prefixes using 89441 possible paths and
only 814 unique ASN's in those paths. So already there are a couple of
ASN's announcing multiple prefixes: 1088*100/814 = 13.3% overhead there.
If thus every active-ish ASN today got a prefix, we would end up with
40k + 13.3% =~ 53k prefixes. Still a lot lower than IPv4, but in that
setup I am assuming nobody will be doing TE, and people will do TE.
Architecturally, they are certainly routeable (and so are /128s).
But I am sure they will be filtered.
I have also seen /128's globally being routed over multiple ASN's see
below the /128's are present.
Greets,
Jeroen
--
1 16 (2002::/16 :)
2 19
3 20
3 21
1 22
3 24
2 26
2 27
5 28
1 29
2 30
1 31
639 32
10 33
3 34
32 35
1 36
1 39
30 40
4 42
1 43
3 44
5 45
7 46
1 47
216 48
1 52
2 56
87 64
3 124
7 126
8 128
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