Resolving for hostnames

naga.presin · 05-21-2010, 06:54 AM

How do we configure to resolve for hostnames when an IP address is provided to the DNS server.

Things I tried
==============

Changes made in /etc/named.conf
zone "s170switch" IN {
type master;
file "s170switch.zone";
allow-update { none; };
};
zone "127.168.192.in-addr.arpa" IN {
type master;
file "s170switch.rev";
allow-update { none; };
};

the file with the name "s170switch.zone" was added
$TTL 86400
@ IN SOA s170switch root (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
IN NS s170switch

s60-naga IN A 192.168.127.10
s60-guru IN A 192.168.127.11
s60-hari IN A 192.168.127.12

The file with the name "s170switch.rev" was added
$TTL 86400
@ IN SOA localhost. root.localhost. (
1997022700 ; Serial
28800 ; Refresh
14400 ; Retry
3600000 ; Expire
86400 ) ; Minimum
IN NS localhost.

10 IN PTR s60-naga
11 IN PTR s60-guru
12 IN PTR s60-hari

Changes done to resolve.conf
search s170switch
nameserver 10.16.126.1
nameserver 10.16.126.2

The DNS daemon was started by the resolution failed. Find the logs below

Stopping named: [ OK ]
Starting named: [ OK ]
[anvltest@pt-maa-linux-1 init.d]$ ./named restart
Stopping named: [ OK ]
Starting named: [ OK ]
[anvltest@pt-maa-linux-1 init.d]$ nslookup 192.168.127.11
Server: 10.16.126.1
Address: 10.16.126.1#53

** server can't find 11.127.168.192.in-addr.arpa: NXDOMAIN

Please let me know where I have gone wrong.

bathory · 05-21-2010, 07:34 AM

Hi,

I see that the serial of the reverse zone is 1997022700. Have you increased it after the changes you've done? Also you use as NS the localhost. Is it the same box, with the one with the 10.16.126.1 IP?
And what is your domain? Is it s170switch?
Try this and see if it works:

Code:

$TTL 86400
@ IN SOA localhost. root.localhost. (
  2010052101 ; Serial
  28800 ; Refresh
  14400 ; Retry
  3600000 ; Expire
  86400 ) ; Minimum

  IN NS <host-with-10.16.126.1>

10 IN PTR s60-naga.s170switch.
11 IN PTR s60-guru.s170switch.
12 IN PTR s60-hari.s170switch.

Regarding the forward zone you don't have an A record for the NS (s170switch). You need something like:

Code:

...
 IN NS s170switch.

s170switch. IN A 192.168.127.10
...

Don't forget to increase the serial before reloading named!!

Regards

pixellany · 05-21-2010, 08:05 AM

Please do not post threads with a title of "urgent". We are volunteers and some do not respond well to such words.

Moved to Networking

naga.presin · 05-22-2010, 11:40 AM

I am sorry abt that tag ... i will avoid urgent tags from now on .....

pixellany · 05-23-2010, 06:13 AM

no problem---was bathory's reply useful?