Configuring DNS on a Linux Server

1. Configure the Linux DHCP (Dynamic Host Configuration Protocol) server to include DNS information. In the /etc/dhcp.conf file, add domain-name-servers and domain-name DHCP options.

   subnet 10.2.221.0 netmask 255.255.255.0 {
   range 10.2.221.30 10.2.221.130;
   
   option slp-directory-agent true 10.2.221.2;
   option subnet-mask 255.255.255.0;
   option domain-name-servers 192.168.6.2;
   option domain-name "Availability-221.com";
   option routers 10.2.221.1;
   default-lease-time 40000;
   }

2. Configure the Linux DNS server to include ExtremeWireless Appliance IP addresses.

   Create a file for the domain name configured in dhcp.conf (in this example, "Availability-221.com") as follows at /var/named/chroot/var/named.

   The name of the file should be the following: /var/named/chroot/var/named/named.Availability-221.com

   /var/named/chroot/var/named/named.Availability-221.com
   $TTL 86400
   @     IN    SOA   ns1.availability-221.com.     hostmaster.availability-221.com.    (
                               2      ; serial #
                               28800   ; refresh
                               14400   ; retry
                               3600000 ; expire
                               86400   ; ttl
                               )
                   IN    NS    ns1.availability-221.com.     
   Controller      IN    A     10.2.221.2

3. Add the domain name to the DNS configuration file (/var/named/chroot/etc/named.conf).

   $// 
   // a caching only nameserver config
   // 
   options { 
   /*
    * If there is a firewall between you and nameservers you want
    * to talk to, you might need to uncomment the query-source
    * directive below.  Previous versions of BIND always asked
    * questions using port 53, but BIND 8.1 uses an unprivileged
    * port by default.
    */
   // query-source address * port 53;
   version "Bind";
   recursion no;
   directory "/var/named";
   };
   zone "Availability-221.com" {
          type master;
          file "named.Availability-221.com";
   };
   zone "0.0.127.in-addr.arpa" { 
   type master;
   file "named.local";
   allow-update { none; };

4. Confirm that DNS service is running.

   ps -ef | grep named
   named 10023 1 0 Feb18 ? 00:00:00 /usr/sbin/named -u named -t /var/named/chroot
   root 7687 7531 0 22:14 pts/982 00:00:00 grep named

5. Verify that the domain name is configured properly.

   nslookup Controller.Availability-221.com
   Server:            127.0.0.1
   Address:           127.0.0.1#53
   
   Name:  Controller.Availability-221.com
   Address: 10.2.221.2