[as112-ops] RFC4193 section 4.4

[Paul Vixie]

> Date: Wed, 29 Dec 2010 13:01:15 +0200
> From: Aleksi Suhonen <as112-ops at trex.fi>
> 
> On 12/29/10 11:52, Clement Cavadore wrote:
> > Why not serving IPv6 zones with IPv6-only servers ? :)
> 
> I posit that the majority of the recursive name servers out there are
> still IPv4 only, even if their clients might be IPv6 aware.

a note on the technology:

sounds bad to me.  those recursives currently see no delegations for these
junk PTR zones, so they talk to the root name servers about this traffic.
once there is a delegation, the root name servers are nominally out of the
loop, but if the ipv4-only recursives can't actually reach the new ipv6-only
as112 servers then some of them (older BIND8 servers, which still exist)
will immediately fall back to the root name servers on the assumption that
a purely lame delegation (no servers reachable) can't possibly be right.

for the same reason, delegating these ipv6 junk zones to existing servers
who are lame (which for some anycast perimeters will be true since only half
of the as112 servers in the world are likely to add these zones) then the
clients within those perimeters will in many (old buggy BIND8) cases
immediately repeat their original query toward the root name servers.

therefore the safest way to do this is with new nameserver names (3 and 4)
having both A and AAAA RRs, where the A RRs are in a new ipv6 prefix (not
the one as112 has used up until now).

also, a note on the paperwork:

internet governance has come a long way since i first registered AS112 and
192.175.48.0/24 and asked IANA to add the blackhole-1 and blackhole-2 names.
for example we've launched DNS-OARC and put these resources under DNS-OARC
control.  i expect that ARIN would respond to a request for a second IPv4
block and a new IPv6 block to be used for this as 'critical infrastructure'
even though it doesn't seem 'critical' by some measures.

what i don't know is how IANA would respond to a request to add blackhole-3
and blackhole-4 to IANA.ORG, or how IANA would respond to a request to add
delegations for junk zones inside ip6.arpa.  i think it'll take an RFC since
only IETF would have standing to make those requests.  (whereas for the
blackhole-1 and blackhole-2 names, and for the ipv4 delegations, the root
name server operators just asked john crain (of ICANN) and he just did it.)