1::1/128 + 2::2/128 - GRH Anomalies Delta (2012-08-17)

Jeroen Massar jeroen at unfix.org
Fri Aug 17 11:57:51 CEST 2012

Fri 13T^W17'th surprise ssecial:

/128's.... and in non 2000::/3 space? Really!?

 ::/0                     Default Route
+1::1/128                 Unallocated prefix
+2::2/128                 Unallocated prefix
 64:ff9b::/96             Unallocated prefix
 2000::/3                 Default Route

grh.sixxs.net> show bgp 1::1
BGP routing table entry for 1::1/128
Paths: (21 available, best #21, table Default-IP-Routing-Table)
  Not advertised to any peer
  .... 8781 42298

aut-num:        AS8781
as-name:        QA-ISP
descr:          Qatar Telecom (Qtel) Q.S.C.
org:            ORG-QT1-RIPE

aut-num:        AS42298
as-name:        GCC-MPLS-peering
descr:          Qatar Telecom (Qtel) Q.S.C.
descr:          GCC MPLS peering

Not so strange that some GRH peers are peeking over 10.000 IPv6 prefixes
this way.


5497 good/required prefixes
Minimum of 578 prefixes (-4919)
Average of 9434 prefixes (+3937)
Maximum of 10155 prefixes (+4658)
191 peers, 81 not connected

Note that these are thus carrying 4658 unneeded routes... that means
almost 50% of the current IPv6 routing entries have no need to exist as
the covering prefixes would take care of them.

It's only 2012, lets see what this will look like in say 20 years, it
will likely be a big mess unless people clean up their acts (or buy much
much bigger routers and make smaller folks not be able to use BGP in a
standard way anymore)


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