DNS named

Each DNS server needs its own particular setup when working in each particular environment. In LinuxZoo, all DNS traffic is intercepted for security reasons by the gateway server and handled via a proxy. You must update the named configuration to take this into account.

Configure the /etc/named.conf file with the new options (so put this in the "options {...} area of the file) of

        forwarders { 10.200.0.1; };
        forward only;

Start up the NAMED service and check that it works. If you have been playing with the firewall configuration you will need to reset the firewall settings to the defaults. do that with:

service iptables restart

To start NAMED run "service named start". You have to reload or restart this service when you make a configuration change remember. The easiest way to check that the service and config files work is:

dig localhost @localhost

If it responds then your server is up. It should indicate that the SERVER was 127.0.0.1 (or perhaps ::1 if localhost is considered an IPv6 address) and that localhost an A record of 127.0.0.1.

Create a brand new forward zone for domain "sillynet.net" in the named configuration directory /var/named/. For this you should create a new zone file called "sillynet.zone" (copying named.localhost to sillynet.zone might be a good starting point). Add this file, along with its zone information, to the configuration file /etc/named.conf.

This zone should give:

sillynet.net -> IP address 12.0.0.20
www.sillynet.net -> IP address 12.0.0.30

Now build a reverse zone for sillynet.zone, mapping the 12.0.0.0/24 range to these 2 new names created in the previous question. Put their definitions into a file called "sillynet.rev". You may want to copy from "named.loopback" to help build this file.

The zone should produce:

12.0.0.20 -> sillynet.net
12.0.0.30 -> www.sillynet.net
A nameserver definition for the zone of sillynet.net.

Hints. Remember to have a zone in named.conf. Dots are important. Can the named user read the new file? Any errors in /var/log/messages?

Create a brand new forward zone for domain "advanced.com". For this create a new forward zone file "advanced.zone" (copy named.localhost as a starting point), and a new reverse zone file "advanced.rev" (copy "named.loopback" as a starting point). Add both forward and reverse zones, along with the zone information, to the configuration file /etc/named.conf. The zone will use the 172.16.1.0/24 network, so in the named.conf file the reverse zone will be "1.16.172.in-addr.arpa".

This zone should give:

advanced.com     -> IP address 172.16.1.1
                 -> MX record mail.advanced.com, priority 10
                 -> MX record mail.offsite.com, priority 20
www.advanced.com -> IP address 172.16.1.10,
                               172.16.1.11,
                               172.16.1.12 using a round-robin selection.
172.16.1.1 -> advanced.com
172.16.1.10 -> www.advanced.com
172.16.1.11 -> www.advanced.com
172.16.1.12 -> www.advanced.com
A nameserver definition for the reverse zone of advanced.com.