Problems with classless reverse delegation

John Oliver joliver at
Fri Jan 3 22:19:48 UTC 2003

Yes, I've been Googling... :-)  I think that the ISP that's
authoritative for the addresses in question might be doing something
wrong, but I'm not sure.

I have  The authoritative DNS server,,
supposedly has the NS and CNAME records... the hostmaster swears they're
there and correct.  Nothing that I do on my end makes this work, but,
then again, I've *never* made this work :-(  I just haven't really cared
until now.

My named.conf entry:

zone "" {
        type master;
        file "zone/";

And the zone file:

[joliver at ns joliver]$ cat /var/named/zone/
$TTL 3600
@               IN      SOA (
                2003010302      ; serial number
                3600 1200 1209600 3600 )
                IN      NS

1               IN      PTR
2               IN      PTR
3               IN      PTR
4               IN      PTR
5               IN      PTR
6               IN      PTR

One of the reasons why I think the ISP might have things wrong:

[joliver at ns joliver]$ dig -x

; <<>> DiG 9.2.1rc1 <<>> -x
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 39982
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;     IN      PTR

;; Query time: 33 msec
;; WHEN: Fri Jan  3 14:18:44 2003
;; MSG SIZE  rcvd: 43

And another:

[joliver at ns joliver]$ nslookup
Note:  nslookup is deprecated and may be removed from future releases.
Consider using the `dig' or `host' programs instead.  Run nslookup with
the `-sil[ent]' option to prevent this message from appearing.

** server can't find SERVFAIL

John Oliver, CCNA                  
Linux/UNIX/network consulting
***               sendmail, Apache, ftp, DNS, spam filtering         ***
****                Colocation, T1s, web/email/ftp hosting          ****

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