BIND : Configure for External Network2022/04/26

	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.default-zones";
# 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;

        //=======================================================================
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See https://www.isc.org/bind-keys
        //=======================================================================

        dnssec-validation auto;

        # 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 master;
        file "/etc/bind/srv.world.wan";
        allow-update { none; };
};
zone "80.0.16.172.in-addr.arpa" IN {
        type master;
        file "/etc/bind/80.0.16.172.db";
        allow-update { none; };
};

# if you don't use IPv6 and also suppress logs for IPv6 related, possible to change
# set BIND to use only IPv4

root@dlp:~#

vi /etc/default/named

# add

OPTIONS="-u bind

-4

# For how to write the section [*.*.*.*.in-addr.arpa], write your network address reversely like follows
# case of 172.16.0.80/29
# network address     ⇒ 172.16.0.80
# network range       ⇒ 172.16.0.80 - 172.16.0.87
# how to write        ⇒ 80.0.16.172.in-addr.arpa

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

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