Open or not open, that is the stupid question.

If you want to setup DNS round robin, just add the record like below into your database. ; dns round robin rr      IN      A       192.168.0.101 rr      IN      A       192.168.0.102 rr      IN      A       192.168.0.103 Wish this helps. regards, Stanley Huang

If you want to instal DNS on Ubuntu, the steps of DNS setup as the following: 1. install bind9 # apt-get -y install bind9 2. setup named.conf.local # cat /etc/bind/named.conf.local // // Do any local configuration here // // Consider adding the 1918 zones here, if they are not used in your // organization //include "/etc/bind/zones.rfc1918"; # This is the zone definition. replace example.com with your domain name zone "example.com" {         type master;         file "/etc/bind/zones/example.com.db";         }; # This is the zone definition for reverse DNS. replace 0.168.192 with your network address in reverse notation - e.g my network address is 192.168.0 zone "0.168.192.in-addr.arpa" {      type master;      file "/etc/bind/zones/rev.0.168.192.in-addr.arpa"; }; 3. setup named.conf.options # cat /etc/bind/named.co...