Reverse DNS woes.

[Reid Sutherland]

Hi everyone,

	I'm very confused as too why my reverse DNS is no longer working.  What is 
going wrong here?  I must have done something wrong, please straighten me 
out.  

See details below. 

_____________________________________________________

IP used in all tests: 216.223.80.10

Output from nslookup on a.root-servers.net
_____________________________________________________
simple:~# nslookup
Default Server:  localhost
Address:  127.0.0.1
 
> server a.root-servers.net
Default Server:  a.root-servers.net
Address:  198.41.0.4
 
> set debug
> 216.223.80.10
Server:  a.root-servers.net
Address:  198.41.0.4
 
;; res_nmkquery(QUERY, 10.80.223.216.in-addr.arpa, IN, PTR)
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 37028, rcode = NOERROR
        header flags:  response, want recursion
        questions = 1,  answers = 0,  authority records = 2,  additional = 0
 
    QUESTIONS:
        10.80.223.216.in-addr.arpa, type = PTR, class = IN
    AUTHORITY RECORDS:
    ->  80.223.216.in-addr.arpa
        nameserver = NS1.SUDBURYWIRED.COM
        ttl = 345600 (4D)
    ->  80.223.216.in-addr.arpa
        nameserver = NS2.SUDBURYWIRED.COM
        ttl = 345600 (4D)
 
------------
Authoritative answers can be found from:
80.223.216.in-addr.arpa
        nameserver = NS1.SUDBURYWIRED.COM
        ttl = 345600 (4D)
80.223.216.in-addr.arpa
        nameserver = NS2.SUDBURYWIRED.COM
        ttl = 345600 (4D)
*** No address (A) records available for 216.223.80.10
______________________________________________________


Output from nslookup on ns1.sudburywired.com
______________________________________________________
simple:~# nslookup
Default Server:  localhost
Address:  127.0.0.1
 
> server ns1.sudburywired.com
Default Server:  ns1.sudburywired.com
Address:  216.223.90.2
 
> set debug
> 216.223.80.10
Server:  ns1.sudburywired.com
Address:  216.223.90.2
 
;; res_nmkquery(QUERY, 10.80.223.216.in-addr.arpa, IN, PTR)
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1077, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 2,  additional = 1
 
    QUESTIONS:
        10.80.223.216.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  10.80.223.216.in-addr.arpa
        name = simple.isys.ca
        ttl = 14160 (3h56m)
    AUTHORITY RECORDS:
    ->  80.223.216.in-addr.arpa
        nameserver = ns1.isys.ca
        ttl = 14160 (3h56m)
    ->  80.223.216.in-addr.arpa
        nameserver = ns2.isys.ca
        ttl = 14160 (3h56m)
    ADDITIONAL RECORDS:
    ->  ns1.isys.ca
        internet address = 216.223.80.10
        ttl = 5759 (1h35m59s)
 
------------
Name:    simple.isys.ca
Address:  216.223.80.10
______________________________________________________


Output from nslookup on simple.isys.ca
______________________________________________________
simple:~# nslookup
Default Server:  localhost
Address:  127.0.0.1
 
> set debug
> 216.223.80.10
Server:  localhost
Address:  127.0.0.1
 
;; res_nmkquery(QUERY, 10.80.223.216.in-addr.arpa, IN, PTR)
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 11129, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion 
avail.
        questions = 1,  answers = 1,  authority records = 2,  additional = 2
 
    QUESTIONS:
        10.80.223.216.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  10.80.223.216.in-addr.arpa
        name = simple.isys.ca
        ttl = 14400 (4H)
    AUTHORITY RECORDS:
    ->  80.223.216.in-addr.arpa
        nameserver = ns1.isys.ca
        ttl = 14400 (4H)
    ->  80.223.216.in-addr.arpa
        nameserver = ns2.isys.ca
        ttl = 14400 (4H)
    ADDITIONAL RECORDS:
    ->  ns1.isys.ca
        internet address = 216.223.80.10
        ttl = 7200 (2H)
    ->  ns2.isys.ca
        internet address = 216.223.80.11
        ttl = 7200 (2H)
 
------------
Name:    simple.isys.ca
Address:  216.223.80.10
______________________________________________________


Output from nslookup on ANY other server (example used: ns2.mci.net)
______________________________________________________
simple:~# nslookup
Default Server:  localhost
Address:  127.0.0.1
 
> server ns2.mci.net
Default Server:  ns2.mci.net
Address:  204.147.128.70
 
> set debug
> 216.223.80.240
Server:  ns2.mci.net
Address:  204.147.128.70
 
;; res_nmkquery(QUERY, 240.80.223.216.in-addr.arpa, IN, PTR)
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 60051, rcode = SERVFAIL
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0
 
    QUESTIONS:
        240.80.223.216.in-addr.arpa, type = PTR, class = IN
 
------------
*** ns2.mci.net can't find 216.223.80.240: Server failed
______________________________________________________


Output from the reverse zone file
______________________________________________________
$TTL 14400
@       IN      SOA     ns1.isys.ca.     root.isys.ca. (
 
                        2001072301
                        10800           ; Refresh 3 hours
                        900             ; Retry 15 minutes
                        604800          ; Expire 7 days
                        7200 )          ; Minimum ttl 2 hours
 
                                IN      NS              ns1.isys.ca.
                                IN      NS              ns2.isys.ca.
 
1       IN      PTR     atm0-gw01-sud.isys.ca.
2       IN      PTR     fw01-sud.isys.ca.
3       IN      PTR     sw01-sud.isys.ca.
4       IN      PTR     sw02-sud.isys.ca.
5       IN      PTR     sw03-sud.isys.ca.
 
10      IN      PTR     simple.isys.ca.
11      IN      PTR     nulled.isys.ca.
12      IN      PTR     complex.isys.ca.
[...]
_________________________________________________________


Any ideas?

-reid