ip6 reverse delegation

Alan Batie alan at peak.org
Fri Jan 17 01:28:56 UTC 2020


I'm having a problem getting ipv6 reverse delegation to work and I'm
hoping someone can tell me what I'm missing, as it seems to me this
should be pretty straightforward:

$ host
4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa
8.8.8.8
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases:

Host
4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa
not found: 3(NXDOMAIN)



The authoritative nameserver is serving it up:

$ host -t ptr
4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa
ns1.rdrop.com
Using domain server:
Name: ns1.rdrop.com
Address: 2607:f678:1010::53#53
Aliases:

4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa
domain name pointer agora.rdrop.com.



The parent authoritative nameserver (for 2607:f678::/32) is serving the
correct delegation NS records:

$ host -t ns 0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa ns1.peak.org
Using domain server:
Name: ns1.peak.org
Address: 2607:f678::53#53
Aliases:

0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns1.rdrop.com.
0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns2.rdrop.com.



Even for the intermediate levels, though I don't think that should
actually be necessary once the delegation gets to the top level
(8.7.6.f.7.0.6.2.ip6.arpa):

$ host -t ns 1.0.1.8.7.6.f.7.0.6.2.ip6.arpa ns1.peak.org
Using domain server:
Name: ns1.peak.org
Address: 2607:f678::53#53
Aliases:

1.0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns1.peak.org.
1.0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns2.peak.org.

$ host -t ns 0.1.8.7.6.f.7.0.6.2.ip6.arpa ns1.peak.org
Using domain server:
Name: ns1.peak.org
Address: 2607:f678::53#53
Aliases:

0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns1.peak.org.
0.1.8.7.6.f.7.0.6.2.ip6.arpa name server ns2.peak.org.

$ host -t ns 1.8.7.6.f.7.0.6.2.ip6.arpa ns1.peak.org
Using domain server:
Name: ns1.peak.org
Address: 2607:f678::53#53
Aliases:

1.8.7.6.f.7.0.6.2.ip6.arpa name server ns2.peak.org.
1.8.7.6.f.7.0.6.2.ip6.arpa name server ns1.peak.org.

$ host -t ns 8.7.6.f.7.0.6.2.ip6.arpa ns1.peak.org
Using domain server:
Name: ns1.peak.org
Address: 2607:f678::53#53
Aliases:

8.7.6.f.7.0.6.2.ip6.arpa name server ns2.peak.org.
8.7.6.f.7.0.6.2.ip6.arpa name server ns1.peak.org.



But dig +trace ptr
4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa
stops at the delegation point:

...
8.7.6.f.7.0.6.2.ip6.arpa. 86400	IN	NS	ns1.peak.org.
8.7.6.f.7.0.6.2.ip6.arpa. 86400	IN	NS	ns2.peak.org.
8.7.6.f.7.0.6.2.ip6.arpa. 10800	IN	NSEC	0.8.6.f.7.0.6.2.ip6.arpa. NS
RRSIG NSEC
8.7.6.f.7.0.6.2.ip6.arpa. 10800	IN	RRSIG	NSEC 5 10 10800 20200130213553
20200116203553 24441 0.6.2.ip6.arpa.
HB6oy5WCbGQH+RKy+FvQyQXSKhls4a/Enfryn/ef4pfE7b9cCuFDYhYm
RiMf739Ju+HRXl2Vj/+rzTSyjjnF7HZkkjVHdWn2avlir11h4oXrVmQY
yTPzPXXixlO0VJqQiBpq+XsPuZHqyIpYeu/KESXLphSHQbuSDk58Kjbg B/8=
;; Received 365 bytes from 2001:67c:e0::10#53(arin.authdns.ripe.net) in
138 ms

0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa. 300 IN SOA	ns1.peak.org.
hostmaster.peak.org. 2020011606 3600 3600 86400 300
;; Received 160 bytes from 2607:f678::53#53(ns1.peak.org) in 1 ms



ns1.peak.org is running bind 9.9.7-P2

The zone file is:

$ORIGIN .
$TTL 300	; 5 minutes
0.1.0.1.8.7.6.f.7.0.6.2.ip6.arpa IN SOA	ns1.peak.org. hostmaster.peak.org. (
				2020011606 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				86400      ; expire (1 day)
				300        ; minimum (5 minutes)
				)
			NS	ns1.rdrop.com.
			NS	ns2.rdrop.com.

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