An option for FQDNs in DHCP options

Document Type Expired Internet-Draft (dhc WG)
Authors Ralph Droms  , Yakov Rekhter 
Last updated 1997-07-25
Stream Internent Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


DHCP [DHCP] can be used to automate the process of configuring TCP/IP host computers. However, some of the DHCP options carry IP addresses rather than Fully Qualified Domain Names (FQDN). Use of IP addresses constrains the DHCP client to use the addresses that were in use at the time the client received its configuration information; these addresses may change over time, (e.g., a server may be assigned a new IP address), so that the IP addresses used by the client may become invalid. An alternative to passing IP addresses is to pass FQDNs instead of (numeric) IP addresses. Doing this allows a client to defer binding between a particular network entity (e.g., a server) and its IP address until run time. As stated in [Carpenter:96], 'Deferring the binding avoids the risk of changed mapping between IP addresses and specific network entities (due to changing addressing information). Moreover, reliance on FQDNs (rather than IP addresses) also localizes to the DNS the changes needed to deal with changing addressing information due to renumbering.' This document defines a new DHCP option that allows the use of FQDNs instead of IP addresses in DHCP options.


Ralph Droms (
Yakov Rekhter (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)