Port 68 supports DHCP client and bootpc (TCP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
Client-side endpoint for DHCP configuration responses.
DHCP servers or relays return offers, acknowledgements and configuration to clients on UDP 68.
Server to client
Permit only the required broadcast or relay path and monitor for unexpected address assignments.
bootpc (TCP reference coverage) is documented as a network service convention for port 68 over TCP.
Use this reference entry when identifying or validating systems documented to use 68/TCP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.