Using BIND in Linux we will make a private DNS server to give access to limited websites.Here this BIND settings is only for giving access to vjudge.net for arranging Internal Programming Contest in a network. uva Problemset cant be seen. These problem set is needed to be printed out.But solution can be Submitted and no problem is seen on verdict.
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install "bind9" in your Linux Machine.
$ sudo apt-get install bind* -
Backup following files of the machine
/etc hosts
/etc hostname
/etc resolv.conf
/etc/bind named.conf.options
/etc/bind named.conf.local -
see your machine inet address (mine was 192.168.1.2).
$ifconfigIt's recommended to set a reserve address for that machine in the router.There are a setting called "Address Reservation" somewhere in the router LAN setup. Reserve the machine MAC address to 192.168.1.2 is recommended
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/etc hosts => Do commenting to the host 127.0.1.1 server and set up like the given hosts
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/etc resolv.conf => Do comment the nameserver
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/etc/bind named.conf.options => setup like here
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/etc/bind named.conf.local => copy paste it
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download and paste "zone" folder and place it to /etc/bind/
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Disable the machines firewall
$ sudo ufw disable
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$ sudo service bind9 start
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open another terminal and run
$ sudo tail -f /var/log/syslog-
You must note down the DNS servers (primary and secondary) which will be needed later. Normally it is 8.8.8.8 and 8.8.4.4 is given which is google's DNS server login to router and set primary DNS to the innet address of the machine (here mine was 192.168.1.2) and as i didnt setup secondary DNS (its not good idea though work) so keep it 192.168.55.55 as random
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block service of udp/tcp for port 53 in the router. This setting lies in somewhere in the router (I found it on advance>security>block services in Netgear router).
If you Dont block it, the DNS will not work for android phones as all sites will be accessible from android phones