Port 67 · DHCP Server

Port 67 is DHCP Server, UDP.

DHCP server — listens for client discover and request broadcasts.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service udp-67 protocol udp port 67

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application dhcp service udp-67 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -ulnp | grep :67
• nmap nmap -sU -p 67 <host>

Related ports

• 68 DHCP Client
• 546 DHCPv6 Client
• 547 DHCPv6 Server

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