Server DNS not resolving on CentOS 6

Question

i have CentOS 6 installed on VPS, where i have installed BIND and setup additional IP on VPS as well for nameservers

as ns1.domain.com and ns2.domain.com

i am unable to get the same resolved to properly work..

some troubleshoots i have done results are as follows:

[root@domain ~]# service named restart Stopping named: . [ OK ] Starting named: [ OK ] [root@domain ~]# netstar -tcp -bash: netstar: command not found [root@domain ~]# service named status version: 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.3 CPUs found: 2 worker threads: 2 number of zones: 16 debug level: 0 xfers running: 0 xfers deferred: 0 soa queries in progress: 0 query logging is OFF recursive clients: 0/0/1000 tcp clients: 0/100 server is up and running named (pid 7488) is running... [root@domain ~]# rndc status version: 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6_8.3 CPUs found: 2 worker threads: 2 number of zones: 16 debug level: 0 xfers running: 0 xfers deferred: 0 soa queries in progress: 0 query logging is OFF recursive clients: 0/0/1000 tcp clients: 0/100 server is up and running 

Problem solved i have used alternate solution for this problem. Thanks for help.

Answer 1

Indeed you have iptables setup to block everything except connections to ssh and ftp (ports 22 and 21 tcp).

You'll have to allow access to your port 53 in UDP and TCP for your DNS server to be reachable from outside (obviously you can limit who can connect based on your needs). Try this:

iptables -I INPUT -m udp -p udp --dport 53 -j ACCEPT iptables -I INPUT -m tcp -p tcp --dport 53 -j ACCEPT 

After that your DNS server should be accessible from the outside, try from your client to resolve something, for example:

host google.com xxx.xxx.xxx.xxx 

In case this configuration is ok, you can save the firewall rules with this:

service iptables save