Primary DNS

Requirements

• IP: 192.168.1.1/24, DNS points to itself
• Forward/reverse zones for infanx.com

Configuration

setenforce 0 && systemctl stop firewalld
# NIC: BOOTPROTO=static, IPADDR=192.168.1.1, NETMASK=255.255.255.0, DNS1=192.168.1.1
yum install -y bind* vim*

Edit /etc/named.conf — set dnssec-enable no; dnssec-validation no;

Edit zone file /etc/named.rfc1912.zones:

zone "1.168.192.in-addr.arpa" { type master; file "infanx.com.loopback"; };
zone "infanx.com" { type master; file "infanx.com.empty"; };

Copy templates: cp -p named.localhost infanx.com.empty && cp -p named.loopback infanx.com.loopback

Forward file (infanx.com.empty): NS/A/CNAME/MX records as per requirements. Reverse file (infanx.com.loopback): PTR records for each IP.

systemctl restart named
nslookup  # verify all records resolve correctly

Caching DNS (Forwarder)

Install DNS, edit /etc/named.conf:

forwarders { 192.168.1.1; };
forward first;

Or configure per-zone forwarding in named.rfc1912.zones.

Secondary DNS (DNS Cluster)

Add NS/A records for secondary DNS in primary zone files. On secondary: type slave; file "slaves/..."; masters { 192.168.1.1; }; Remember to increment SOA serial on primary when updating zones.

Sub-DNS (Subdomain Delegation)

Parent adds NS record pointing to child DNS: frp IN NS ns1.frp / ns1.frp IN A 192.168.1.200 Child creates zone frp.infanx.com with its own records.