DNS is very important component of network infrastructure, without
DNS we can’t browse a website with host-name. DNS translate human
readable hostnames such as www.broexperts.com into machine readable ip addresses such as 128.123.1.73.
This translation also occurs when you are connecting to other system
on your local network through their host-names instead of their IP
addresses. Most of Internet DNS Server (root DNS Servers) run BIND as
their DNS software.
In this article we cover BIND installation.
Server Name = dns.broexperts.com
Server Name = dns.broexperts.com
Server IP = 192.168.0.211/24
Step 1. Installation of required packages.
We use yum to install BIND packages.
# yum -y install bind bind-libs bind-utils
Step 2. Set BIND service start on system boot
# chkconfig –-level 35 named on
Step 3. Start named service for generating some default configuration files.
# service named start
Step 4. Edit main configuration file and add zone entry of www.broexperts.com.
# vi /etc/named.conf
// // named.conf // // Provided by Red Hat bind package to configure the ISC BIND named(8) DNS // server as a caching only nameserver (as a localhost DNS resolver only). // // See /usr/share/doc/bind*/sample/ for example named configuration files. // options { 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"; recursion yes; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; zone "." IN { type hint; file "named.ca"; }; zone "broexperts.com" { type master; file "broexperts.com.fwd"; }; zone "0.168.192.in-addr.arpa" { type master; file "broexperts.com.rev"; }; include "/etc/named.rfc1912.zones";
Step 5. Create Zone files which we mentioned in named.conf file.
# cd /var/named
# vi broexperts.com.fwd
$ORIGIN broexperts.com. $TTL 3D @ SOA dns.broexperts.com. root.broexperts.com. (12 4h 1h 1w 1h) @ IN NS dns.broexperts.com. dns.broexperts.com. IN A 192.168.0.211 www IN A 192.168.0.211
# vi broexperts.com.rev
$ORIGIN 0.168.192.in-addr.arpa. $TTL 3D @ SOA dns.broexperts.com. root.broexperts.com. (12 4h 1h 1w 1h) @ IN NS dns.broexperts.com. 211 IN PTR dns.broexperts.com.
Step 6. Restart BIND Service
# service named restart
Step 7. Test your DNS server
Note : Before testing , make sure your /etc/resolve.conf file contain DNS server ip that has been set up.
# cat /etc/resolve.conf search broexperts.com nameserver 192.168.0.211
# nslookup www.broexperts.com Server: 192.168.0.211 Address: 192.168.0.211#53 Name: www.broexperts.com Address: 192.168.0.211
# nslookup 192.168.0.211 Server: 192.168.0.211 Address: 192.168.0.211#53 211.0.168.192.in-addr.arpa name = dns.broexperts.com.
