DNS request timed out. timeout was 2 seconds

bindnameserver

i had setup bind dns server on centos. from local lan it will work fine but from remote when i tried to nslookup ..it will give reply like "DNS request timed out…timeout was 2 seconds."

what is the problem?

this is my bind config—-

// Red Hat BIND Configuration Tool

options {
        directory "/var/named";
        dump-file "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        query-source address * port 53;
};

controls {
           inet 127.0.0.1 allow {localhost; } keys {rndckey; };
};

acl internals {
    127.0.0.0/8;
    192.168.0.0/24;
    10.0.0.0/8;

};

view "internal" {
    match-clients { internals; };
    recursion yes;
    zone "mydomain.com" {
       type master;
       file "mydomain.com.zone";
    };


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

};

zone "." IN {
        type hint;
        file "named.root";
};

zone "localdomain." IN {
        type master;
        file "localdomain.zone";
        allow-update { none; };
};

zone "localhost." IN {
        type master;
        file "localhost.zone";
        allow-update { none; };
};

zone "0.0.127.in-addr.arpa." IN {
        type master;
        file "named.local";
        allow-update { none; };

};

zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa." I
N {
        type master;
        file "named.ip6.local";
        allow-update { none; };
};

zone "255.in-addr.arpa." IN {
        type master;
        file "named.broadcast";
        allow-update { none; };
};

zone "0.in-addr.arpa." IN {
        type master;
        file "named.zero";
        allow-update { none; };
};

};
view "external" {
 match-clients { any; };
    recursion no;
    zone "mydomain.com" {
       type master;
       file "mydomain.com.zone";
   //    file "/var/named/chroot/var/named/mydomain.com.zone";
    };


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

};

include "/etc/rndc.key";

Best Answer

At first, just check your DNS resolver. i mean the machines you used to see nslookup output.
try this command to see your own dns caching server's performance. 

nslookup mydomain.com 8.8.8.8
for query from google dns cache. it's important to check several dns caching servers to see the performance.

if you are in TR. Also try these caching servers to see performance difference.
193.140.100.215 (METU dns cache) and 88.255.129.22 (My own caching server).
if you still have timeout with these Dns caching serves.

try intodns.com to confirm your connection & bind config.
eg: http://www.intodns.com/mydomain.com

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