DHCP Protocol Messages and Addresses

Sit back for a moment, and think about the role of DHCP for a host computer. The host acts as a DHCP client. As a DHCP client, the host begins with no IPv4 settings: no IPv4 address, no mask, no default router, and no DNS server IP addresses. But a DHCP client does have knowledge of the DHCP protocol, so the client can use that protocol to (a) discover a DHCP server and (b) request to lease an IPv4 address.

The DHCP process to lease an IP address uses the following four messages between the client and server. (Also, as a way to help remember the messages, note that the first letters spell DORA):


Discover: ...

Get CCENT/CCNA ICND1 100-101 Official Cert Guide now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.