DNS Forwarder

Install a DNS forwarder on CentOS 6.3:

yum install bind

Edit /etc/named.conf:

   1 options {
   2         directory "/var/named";
   3         forwarders { 8.8.8.8; 8.8.4.4; };
   4 };
   5 
   6 zone "example.lan" in {
   7   type forward;
   8   forwarders { 192.168.3.56; };
   9 };
  10 
  11 zone "xpto.lan" in {
  12   type forward;
  13   forwarders { 10.0.3.3; };
  14 };

Run the following commands:

service named start
chkconfig named on
netstat -a -n | grep ":53" | grep LISTEN