[SOLVED] BIND 9: issues with reverse lookup

m0ke · 01-07-2012, 09:57 AM

Hello.

i have set up DNS zone for forward and backward resolutions.

here the content of the respective files:

forware zone:

Code:

$TTL 2d
@               IN SOA          thewho.bsc-solutions.corp.      root.thewho.bsc-solutions.corp. (
                                2012010601      ; serial
                                3h              ; refresh
                                1h              ; retry
                                1w              ; expiry
                                1d )            ; minimum

sap.bsc-solutions.corp. IN NS           thewho.bsc-solutions.corp.
hagen.sap.bsc-solutions.corp.   IN A            192.168.0.17

reverse zone:

Code:

$TTL 2d
$ORIGIN .
0.168.192.in-addr.arpa. IN SOA  thewho.bsc-solutions.corp       (
                                2012010600      ; serial
                                3h              ; refresh
                                1h              ; retry
                                1w              ; expiry
                                3h )            ; minimum

0.168.192.in-addr.arpa. IN NS           thewho.bsc-solutions.corp.
17              IN PTR          hagen.sap.bsc-solutions.corp.

forward name resolution is working fine, but reverse lookups fail.

here the output of "nslookup 192.168.0.17":

Code:

;; Got SERVFAIL reply from 127.0.0.1, trying next server
;; Got SERVFAIL reply from 127.0.0.1, trying next server
Server:         ::1
Address:        ::1#53

** server can't find 17.0.168.192.in-addr.arpa: SERVFAIL

the reverse zone file seems to be buggy, but i cannot find the error.

here the output of "named-checkzone" for the respective reverse zone domain/file:

Code:

dns_rdata_fromtext: /var/lib/named/192.168.0.zone:4: near '3h': not a valid number
/var/lib/named/192.168.0.zone:11: ignoring out-of-zone data (17)
zone 0.168.192.in-addr.arpa/IN: loading from master file /var/lib/named/192.168.0.zone failed: not a valid number

where is the mistake? "3h" seems to be a valid number from my point of view, this value is also used in other config files i found in www.

i am running BIND 9.5.0-P2

thanks for any input on this issue!

bathory · 01-07-2012, 10:45 AM

Hi,

You miss the admin's email address in the SOA record.
Also the $ORIGIN is wrong. You can omit it, or use the actual zone name instead of the ".":

Code:

$TTL 2d
$ORIGIN 0.168.192.in-addr.arpa.
0.168.192.in-addr.arpa. IN SOA  thewho.bsc-solutions.corp    root.thewho.bsc-solutions.corp.    (
                                2012010600      ; serial
                                3h              ; refresh
                                1h              ; retry
                                1w              ; expiry
                                3h )            ; minimum

0.168.192.in-addr.arpa. IN NS           thewho.bsc-solutions.corp.
17              IN PTR          hagen.sap.bsc-solutions.corp.

Regards

m0ke · 01-07-2012, 10:51 AM

Thanks bathory,

you have solved my problem!

thank you very very much!
--M0KE

Skaperen · 01-08-2012, 04:07 PM

Quote:

Originally Posted by m0ke

Thanks bathory,

you have solved my problem!

thank you very very much!
--M0KE

Please mark the tread as SOLVED. Find this action under the "Thread Tools" menu showing right above the first post. This way, people with a similar or like issue can see from a glance that this is the thread to read to find the solution (as opposed to a thread where a bunch of speculation and "me too" posts are found).

IvanMP · 09-10-2012, 07:45 AM

Hi all,

I have the similarly problem and i have the next zones ....

Quote:

$ttl 38400
tm.example.com.cm. IN SOA tm.example.com.cm. ivan.tm.example.com.cm. (
1347276249
10800
3600
604800
38400 )
tm.example.com.cm. IN NS tm.example.com.cm.
tm.example.com.cm. IN MX 10 tm.example.com.cm
tm.example.com.cm. IN A 192.168.100.131

and the revers

Quote:

$ttl 38400
131.100.168.192.in-addr.arpa. IN SOA tm.example.com.cm. ivan.tm.example.com.cm. (
1347276298
10800
3600
604800
38400 )
131.100.168.192.in-addr.arpa. IN NS tm.example.com.cm.
131.100.168.192.in-addr.arpa. IN PTR tm.example.com.cm.

So now when i try nslookup for tm.example.com.cm its ok ... but when i try the revers nslookup fro example nslookup 192.168.100.131 i get this error

;; Got SERVFAIL reply from 192.168.100.131, trying next server

He goes to the next dns server and who know about Ubuntu server (this server tm.example.com.cm) so he back the name the hostname of it ... i dont know why he cant back the answer of its own ...

Here its the output of named-chekzone

Quote:

root@tm:/etc/bind# named-checkzone db.192 db.192
db.192:2: ignoring out-of-zone data (131.100.168.192.in-addr.arpa)
db.192:8: ignoring out-of-zone data (131.100.168.192.in-addr.arpa)
db.192:9: ignoring out-of-zone data (131.100.168.192.in-addr.arpa)
zone db.192/IN: has 0 SOA records
zone db.192/IN: has no NS records
zone db.192/IN: not loaded due to errors.

but i cant understand what im doing wrong

sorry for bad language i hope you understand if not pls ask me ...

Tnx in advance ....

bathory · 09-10-2012, 09:08 AM

@IvanMP

Please don't hijack others' threads. You should start your own giving more details about your distro, config files (like named.conf) etc.

Quote:

Here its the output of named-chekzone

Quote:
root@tm:/etc/bind# named-checkzone db.192 db.192

Note that the above is not correct. You have to run the following to test your zone file:

Code:

named-checkzone 131.100.168.192.in-addr.arpa db.192

Regards

IvanMP · 09-10-2012, 10:16 AM

Sorry for hijack bathory i open new thread
and for the named-checkzone i did that and same error ...