Hello,

I have an issue trying to get a name resolution (GPRS network).

root@GPRSDNS:~# dig +trace mncxxx.mccyyy.gprs

; <<>> DiG 9.7.1-P2 <<>> +trace mncxxx.mccyyy.gprs
;; global options: +cmd
. 6824 IN NS grxns1.xxxxxx.grx.
. 6824 IN NS grxns2.xxxxxx.grx.
;; Received 104 bytes from 127.0.0.1#53(127.0.0.1) in 0 ms

mncxxx.mccyyy.gprs. 86400 IN NS DNS1.mncxxx.mccyyy.gprs.
mncxxx.mccyyy.gprs. 86400 IN NS DNS2.mncxxx.mccyyy.gprs.
;; Received 106 bytes from 191.252.243.12#53(grxns2.xxxxxxx.grx) in 415 ms

;; connection timed out; no servers could be reached


But if I enter:

root@GPRSDNS:~# dig mncxxx.mccyyy.gprs @191.252.243.12

; <<>> DiG 9.7.1-P2 <<>> mncxxx.mccyyy.gprs @191.252.243.12
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20031
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;mncxxx.mccyyy.gprs. IN A

;; AUTHORITY SECTION:
mncxxx.mccyyy.gprs. 86400 IN NS DNS1.mncxxx.mccyyy.gprs.
mnc003.mcc470.gprs. 86400 IN NS DNS2.mncxxx.mccyyy.gprs.

;; ADDITIONAL SECTION:
DNS1.mncxxx.mccyyy.gprs. 86400 IN A 201.233.14.46
DNS2.mncxxx.mccyyy.gprs. 86400 IN A 203.233.14.77

;; Query time: 415 msec
;; SERVER: 191.252.243.12#53(191.252.243.12)
;; WHEN: Tue Oct 25 15:24:38 2011
;; MSG SIZE rcvd: 106

It is working fine.

What would be the problem ?

Hi,

From the "dig +trace" output, looks like the next hop, after 191.252.243.12 cannot be contacted. I guess it's the authoritative name server for the host you're looking up. Could be a firewall problem, or it doesn't allow-queries except from certain hosts, etc

The 2nd dig command gives the correct answer probably because 191.252.243.12 has the record still cached.

Regards

So basically the DNS server is ok to response to 191.252.243.12 but not from me ?

If there is firewall (most likely) in between you and the dns server denying access to you and allows access from 191.252.243.12, then yes, it will answer only to that host

Thank you,

I will contact the remote DNS server admin.