Question: what is the difference between dhcp port 67 and 68?
Answer: It is implemented with two UDP port numbers for its operations which are the same as for the bootstrap protocol (BOOTP). UDP port number 67 is the destination port of a server, and UDP port number 68 is used by the client. ... If the client and server are on different subnets, a DHCP Helper or DHCP Relay Agent may be used.