[SOLVED] error "server can't find 254.0.168.192.in-addr.arpa: SERVFAIL" in dns server

piyusharora420 · 01-09-2011, 03:52 AM

hi everybody,
nslookup command is giving me an error.otherwise dns is working ok.when i try to look for server from client using

Code:

nslookup 192.168.0.254

i got the following error :-

Code:

** server can't find 254.0.168.192.in-addr.arpa: SERVFAIL

but

Quote:

ping server.example.com

is working fine.
i think there should be problem in reverse zone file so i am posting my reverse zone file

Code:

$TTL    86400
@       IN      SOA     example.com. root.server.example.com.  (
                                      1997022701 ; Serial
                                      28800      ; Refresh
                                      14400      ; Retry
                                      3600000    ; Expire
                                      86400 )    ; Minimum
        IN      NS              server.example.com
254     IN      PTR             server.example.com.
1       IN      PTR             client1.example.com.
2       IN      PTR             client2.
3       IN      PTR             client3.example.com.

please tell me what is meaning of this error?

bathory · 01-09-2011, 04:17 AM

Hi,

You miss the trailing dot in the NS record:

Code:

        IN      NS              server.example.com.

Regards

piyusharora420 · 01-09-2011, 04:22 AM

i have checked with trailing dot and without trailing dot.its not affection at all.service restarts successfuly.

bathory · 01-09-2011, 04:29 AM

The trailing dot is needed. Otherwise the zone name is attached in the hostname, so what you catually have is: " IN NS server.example.com.0.168.192.in-addr.arpa".
The service starts succesfully, because this is not a syntax error in the configuration, but an error in the zone file.
Note that you need to increase the serial number and reload bind.

piyusharora420 · 01-09-2011, 04:35 AM

i have increased serial number already.trailing dot is also there.but still got the same error.how to reload bind?

bathory · 01-09-2011, 04:41 AM

You can either restart the service, or use

Code:

rndc reload

piyusharora420 · 01-09-2011, 04:44 AM

yea i have done that.still got same error.

piyusharora420 · 01-09-2011, 04:45 AM

my named.conf file is

Quote:

options {
directory "/var/named/";
};

zone "example.com" IN
{ type master;
file "example.com.zone";
allow-transfer{192.168.0.0/24;};
};

zone "0.168.192.in-addr.arpa.zone" IN
{
type master;
file "0.168.192.in-addr.arpa.zone";
};

bathory · 01-09-2011, 04:49 AM

Oups, you have another error in the SOA record of zone file. It should be:

Code:

@       IN      SOA     server.example.com. root.server.example.com. (

piyusharora420 · 01-09-2011, 04:54 AM

i have done this edit to.but still same error.
my /etc/hosts file of server is

Quote:

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 server.example.com server localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.0.2 client2 client2
192.168.0.254 server.example.com server.example.com
192.168.0.3 client3.example.com client3.example.com
192.168.0.1 client1.example.com client1.example.com

my /etc/resolv.conf of server is

Quote:

search example.com
nameserver 192.168.0.254

my /etc/reslov.conf of client side is

Quote:

search example.com
nameserver 192.168.0.254

bathory · 01-09-2011, 05:02 AM

Hmm, another error in named.conf.
Replace:

Quote:

zone "0.168.192.in-addr.arpa.zone" IN

with:

Code:

zone "0.168.192.in-addr.arpa" IN

piyusharora420 · 01-09-2011, 05:07 AM

yes now nslookup is working fine.i have spent 3 days on this stupid silly mistake.thanx alot bathory.i want to ask one thing more.is it make difference if i use

Quote:

example.com.

instead of

Quote:

server.example.com

in reverse zone file?

bathory · 01-09-2011, 05:12 AM

If example.com. can be resolved (i.e. you have an A record in the forward zone for example.com), then you can use it. Of course you need to change both SOA and NS records accordingly.

Please use "Thread Tools" and mark the thread as "SOLVED"

Regards

piyusharora420 · 01-09-2011, 05:18 AM

my forward zone file is

Quote:

$TTL 86400
@ IN SOA example.com. root (
43 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum

@ NS server.example.com
server A 192.168.0.254
client1 A 192.168.0.1
client2 A 192.168.0.2
client3 A 192.168.0.3

i have used example.com as SOA record and server.example.com as ns record here.so it means i can use example.com instedad of server.example.com in reverse zone error?

bathory · 01-09-2011, 08:33 AM

Quote:

i have used example.com as SOA record and server.example.com as ns record here.so it means i can use example.com instedad of server.example.com in reverse zone error?

As I've already told if you want to do this you need to give example.com an A record. So the forward zone should look like this:

Code:

$TTL 86400
@ IN SOA server.example.com. root.server.example.com. (
44 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum

@ NS server.example.com.
example.com. A 192.168.0.254
server A 192.168.0.254
client1 A 192.168.0.1
client2 A 192.168.0.2
client3 A 192.168.0.3

Then in reverse zone the following should work:

Code:

  IN      NS      example.com.

Cheers