IPv6 Prefix Policy

Leo Bicknell bicknell at ufp.org
Thu Jul 3 15:12:37 UTC 2008

In a message written on Thu, Jul 03, 2008 at 04:55:37PM +0200, Jeroen Massar wrote:
> In general though, ASNs are following:
> http://www.space.net/~gert/RIPE/ipv6-filters.html
> I don't know how common the strict/non-strict case is though, but 
> looking at GRH (http://www.sixxs.net/tools/grh/) it seems that most 
> ASN's are properly filtering, thus using the strict model.

The strict filter is still broken in at least one way.

ipv6 prefix-list ipv6-ebgp-strict permit 2001:500::/30 ge 48 le 48


Note that there are /45's, /46's, /47's and /48's right now.  The
filter allows only /48's.  Of note, this will break access to the
F-Root name server, we announce it from both a /47 and a /48 (local
peers only) in IPv6.

I believe there are other issues with the strict filter, but don't have
the time to track them down right now.

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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