BIG problem with reverse lookup

marcroy.olsen at gmail.com marcroy.olsen at gmail.com
Tue Mar 18 10:31:07 UTC 2008


hi list,

I have some problems doing reverse lookups. It works fin on me lan
using me own DNS server:

#nslookup 130.226.142.23
Server:		130.226.142.2
Address:	130.226.142.2#53

23.142.226.130.in-addr.arpa	name = mx1.itu.dk.


It also works if I ask me own DNS server from the outside:

#nslookup 130.226.142.23 130.226.142.2
Server:		130.226.142.2
Address:	130.226.142.2#53

23.142.226.130.in-addr.arpa	name = mx1.itu.dk.


But if I just use a random DNS server outside my lan, i get:

#nslookup
> set debug
> 130.226.142.23
Server:		192.168.1.1
Address:	192.168.1.1#53

------------
    QUESTIONS:
	23.142.226.130.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    AUTHORITY RECORDS:
    ->  142.226.130.in-addr.arpa
	origin = ns.itu.dk
	mail addr = hostmaster.itu.dk
	serial = 2006040401
	refresh = 28800
	retry = 7200
	expire = 604800
	minimum = 86400
    ADDITIONAL RECORDS:
------------
** server can't find 23.142.226.130.in-addr.arpa: NXDOMAIN


But it works for other address in that same zone file (also outside me
lan):

#nslookup
> set debug
> 130.226.142.19
Server:		212.97.202.2
Address:	212.97.202.2#53

------------
    QUESTIONS:
	19.142.226.130.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  19.142.226.130.in-addr.arpa
	name = haddock.itu.dk.
    AUTHORITY RECORDS:
    ->  .
	nameserver = j.root-servers.net.
    ->  .
	nameserver = k.root-servers.net.
    ADDITIONAL RECORDS:
------------
Non-authoritative answer:
19.142.226.130.in-addr.arpa	name = haddock.itu.dk.

Authoritative answers can be found from:
.	nameserver = j.root-servers.net.
>


Any one have any idea to what this could be?
I can see on the lookup that fails, that the serial is 2006040401. But
if I look in the  142.226.130.in-addr.arpa zone file I have this
serial: 2008180301
And I have made changes to the 142.226.130.in-addr.arpa zone file
since 2006, and this works fin.

Any help or test i might run to get more info is appreciated.

OS:Fedora 7
Bind: 9.4.1

Best Regard

Marc


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