BIND : Configure for External Network

	Install BIND to Configure DNS (Domain Name System) Server to provide Name or Address Resolution service for Clients.
[1]	Install BIND.

root@dlp:~#  apt -y install bind9 bind9utils

[2]	On this example, Configure BIND for External Network. The example follows is for the case that External network is [172.16.0.80/29], Domain name is [srv.world], Replace them to your own environment. ( Actually, [172.16.0.80/29] is for private IP addresses, though. )

root@dlp:~#  vi /etc/bind/named.conf include "/etc/bind/named.conf.options"; include "/etc/bind/named.conf.local"; include "/etc/bind/named.conf.root-hints"; // add include "/etc/bind/named.conf.external-zones"; root@dlp:~#  vi /etc/bind/named.conf.options options { directory "/var/cache/bind"; // add : receive queries from all hosts allow-query { any; }; // network range you allow to transfer zone files to clients // add secondary DNS servers if it exist allow-transfer { localhost; }; // add : not allow recursion recursion no; dnssec-validation auto; listen-on port 53 { any; }; // if not listen IPV6, change [any] to [none] listen-on-v6 { any; }; }; root@dlp:~#  vi /etc/bind/named.conf.external-zones // create new // add zones for your network and domain name zone "srv.world" IN { type primary; file "/etc/bind/srv.world.wan"; allow-update { none; }; }; zone "0.16.172.in-addr.arpa" IN { type primary; file "/etc/bind/0.16.172.db"; allow-update { none; }; }; root@dlp:~#  vi /etc/default/named # if you don't use IPv6 and also suppress logs for IPv6 related, possible to change # set BIND to use only IPv4 OPTIONS="-u bind  -4 "

[3]	Next, Configure Zone Files for each Zone you set in [named.conf] above. To Configure Zone Files, refer to here.