Caching DNS problem

[Network-Guy]

I am having a problem getting a Fedora Redhat box to service DNS as a caching-DNS server. I have the named service up and running, however it is not responding to queries from other machines. I disabled the firewall to ensure I am not blocking port 53.

Any suggestions?

Thanks

[infoshirish]

Hey,
What queries you are firing on other machines? What is the output of those queries?
Can you post them both? Also post the output of
#dig domainname
#nslookup domainname

[kermit_the_fr0g]

You could check that BIND (I assume you're using BIND) is listening on all interfaces (perhaps it's just listening on loopback), and don't forget to check /var/log/messages

[Network-Guy]

Hey guys thanks for the help. After playing around a bit more, I got it to work. However it may not be the ideal configuration. I changed several options in named.conf from localhost to "any". That did the trick. I also tried to serve some local name resolution, however that didn't work, so I commented it out below.

options {
listen-on port 53 { 127.0.0.1; };
listen-on port 53 { 10.161.205.100; };
listen-on port 53 { 192.168.168.80; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
// query-source port 53;
// query-source-v6 port 53;
allow-query { any; };
recursion yes;
version "0";
};
logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
view localhost_resolver {
match-clients { any; };
match-destinations { any; };
recursion yes;
include "/etc/named.rfc1912.zones";
};

// view "external" {
// match-clients { !localhosts; any; };
//recursion yes;
//allow-transfer { dns_slaves; };
//zone "example.com" {
// type master;
// file "example.com.zone";
// };
//};

zone "." {
type hint;
file "/var/named/root.hints";
};

zone "0.0.127.in-addr.arpa" {
type master;
file "/var/named/127.0.0";
};

[infoshirish]

Hey,
Your most welcome. That was cool stuff.

[vijayan]

Which OS you are installed.

For Caching nameserver, you need start named service and then run command -

rndc dumpdb

before rndc command first try with "nslookup domainname"

it will create file called cache_dump.db in /var/named/chroot/var/named/data/


This is for manualy for crontab you want to put entry like this

*/10 * * * * root /usr/sbin/rndc dumpdb

every 10 sec it will run in background