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IPv6 /20 allocated - update your BGP filters!

  • From: Jeroen Massar
  • Date: Mon May 10 12:03:43 2004

Here is a message forwarded for Gert Doering:

-----Forwarded Message-----
From: Gert Doering <>
To: 6bone@ISI.EDU,
Subject: /20 allocated - update your BGP filters!
Date: Mon, 10 May 2004 17:56:51 +0200


the first IPv6 /20 allocation ever has been made today:

inet6num:     2001:2000::/20
netname:      EU-TELIANET-20040510
org:          ORG-TIC2-RIPE
descr:        PROVIDER Local Registry
descr:        TeliaSonera AB
country:      EU

and this means that "if you have been following my filtering
recommendations, this network will not be accepted right now" (the 
current filters had a minimum accepted prefix length of a /24).

I have updated the prefix filter recommendation page:

and urge you to check whether your filters are prepared for these
large prefixes.  (There is a /23 upcoming, and rumors speak of a
/19 being requested "real soon now").

TODO: the "strict" filter could do some grouping for different 
      IPv6 allocation ranges, but this is dangerous today, as we 
      don't know how future allocations will look like.

Note: ICANN just doesn't get it.  They have not allocated a reasonable 
      prefix size to RIPE (like a /8), not even a /19, but "a big chunk of 
      14 sucessive /23s, summing up to a /20+/21+/22" - see the list at

Gert Doering
        -- RIPE Address Policy WG Co-Chair,
           keeper of the IPv6 filter list

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