Reverse Lookups fail

[mayer at gis.net]

----- Original Message Follows -----
> My domain's reverse lookups are succeeding when making queries
> directly to the DNS server, although from anywhere else in the world,
> they are failing.  For example:
> 
> bash-2.05b$ /usr/sbin/nslookup 206.135.58.110 dns1.mindbridge.com
> Server:  dns1.mindbridge.com
> Address:  206.135.58.120
> 
> Name:    mail2.mindbridge.com
> Address:  206.135.58.110
> 
> bash-2.05b$ /usr/sbin/nslookup 206.135.58.110
> Server:  noc.irt.drexel.edu
> Address:  144.118.24.20
> 
> *** noc.irt.drexel.edu can't find 206.135.58.110: Non-existent
> host/domain bash-2.05b$
> 
> 
> All other types of lookups are succeeding from other DNS servers. 
> Does this indicate that our ISP is not delegating reverse lookup
> authority to us?
> 
Yes, it's not delegated to you. You should use DIG and not nslookup
for this kind of thing:

>dig NS 58.135.206.in-addr.arpa.

; <<>> DiG 9.3.0 <<>> NS 58.135.206.in-addr.arpa.
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 776
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;58.135.206.in-addr.arpa.       IN      NS

;; ANSWER SECTION:
58.135.206.in-addr.arpa. 14400  IN      NS      auth2.ns.eni.net.
58.135.206.in-addr.arpa. 14400  IN      NS      auth3.ns.eni.net.
58.135.206.in-addr.arpa. 14400  IN      NS      auth1.ns.eni.net.

;; Query time: 50 msec
;; SERVER: 10.1.10.10#53(10.1.10.10)

>dig NS 110.58.135.206.in-addr.arpa.  @auth1.ns.eni.net

; <<>> DiG 9.3.0 <<>> NS 110.58.135.206.in-addr.arpa. @auth1.ns.eni.net
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 95
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;110.58.135.206.in-addr.arpa.   IN      NS

;; AUTHORITY SECTION:
58.135.206.in-addr.arpa. 14400  IN      SOA     localhost.
root.localhost. 20041
20301 86400 1800 604800 14400

;; Query time: 40 msec
;; SERVER: 205.214.45.6#53(auth1.ns.eni.net)


Danny

> 
> This is the zone file, cut down a little...
> 
> $TTL 3H
> mindbridge.com. IN SOA          dns1.mindbridge.com.
> support.mindbridge.com. (
>                                 2005040801      ; serial
>                                 1D              ; refresh
>                                 4H              ; retry
>                                 6W              ; expiry
>                                 1W )            ; minimum
> 
> mindbridge.com. IN A            206.135.58.101
> mindbridge.com. IN NS           dns1.mindbridge.com.
> mail2           IN A            206.135.58.110
> ..
> 
> 
> Thanks for any help
> 
> Ted Watson
> 
>