Port 68 · DHCP Client

Port 68 is DHCP Client, UDP.

DHCP client — receives offers and acknowledgements from the DHCP server.

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-68 protocol udp port 68

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application dhcp service udp-68 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 :68
• nmap nmap -sU -p 68 <host>

Related ports

• 67 DHCP Server
• 546 DHCPv6 Client
• 547 DHCPv6 Server

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