I-D ACTION:draft-ietf-dhc-fqdn-opt-03.txt

Internet-Drafts@ietf.org Mon, 28 July 1997 14:10 UTC

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Subject: I-D ACTION:draft-ietf-dhc-fqdn-opt-03.txt
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 A Revised Internet-Draft is available from the on-line Internet-Drafts 
 directories. This draft is a work item of the Dynamic Host Configuration 
 Working Group of the IETF.                                                

       Title     : An option for FQDNs in DHCP options                     
       Author(s) : Y. Rekhter, R. Droms
       Filename  : draft-ietf-dhc-fqdn-opt-03.txt
       Pages     : 4
       Date      : 07/25/1997

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.                                   

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