📦 Installation Command
apt install bind9 bind9-utils bind9-dnsutils
BIND9 DNS Server Port & Configuration
bind9 systemctl: namedMost widely used DNS server. Authoritative and recursive resolver.
🔌 Default Ports
53
tcp
DNS queries (TCP)
53
udp
DNS queries (UDP)
953
tcp
rndc control
⚙️ Configuration Files
/etc/bind/named.conf/etc/bind/named.conf.options/etc/bind/named.conf.local/etc/bind/named.conf.default-zones/etc/bind/rndc.key
📂 Default Directories
- config:
/etc/bind - data:
/var/cache/bind - logs:
/var/log/named - zones:
/etc/bind/zones
🔐 Default Credentials
Username:N/A
Password:N/A
💡 rndc uses key-based auth: /etc/bind/rndc.key
⚠️ Conflicts
✅ Works With
🛡️ Security Notes
Disable recursion for authoritative-only, use views, enable DNSSEC, restrict zone transfers, use rate limiting
❓ Frequently Asked Questions
What port does BIND9 use?
BIND9 uses port 53 for both TCP and UDP DNS queries.
Where is BIND9 config?
Main config at /etc/bind/named.conf with zones in /etc/bind/zones/.
BIND9 vs other DNS servers?
BIND9 is the most widely used DNS server, feature-rich but complex.