draft-ietf-dhc-timezone-01.txt   draft-ietf-dhc-timezone-02.txt 
Network Working Group M. W. Carney Network Working Group M. W. Carney
INTERNET-DRAFT Sun Microsystems, Inc. INTERNET-DRAFT Sun Microsystems, Inc.
Expires July 1997 Expires December 1997
DHCP Option for IEEE 1003.1 POSIX Timezone Specifications DHCP Option for IEEE 1003.1 POSIX Timezone Specifications
<draft-ietf-dhc-timezone-01.txt> <draft-ietf-dhc-timezone-02.txt>
Status of this Memo Status of this Memo
This document is an Internet-Draft. Internet-Drafts are working This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas documents of the Internet Engineering Task Force (IETF), its areas
and its working groups. Note that other groups may also distribute and its working groups. Note that other groups may also distribute
working documents as Internet-Drafts. working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
skipping to change at line 47 skipping to change at line 47
DHCP includes an option for the specification of the Universal DHCP includes an option for the specification of the Universal
Coordinated Time Offset [2], which is defined as a two's complement Coordinated Time Offset [2], which is defined as a two's complement
32-bit integer representing the offset in seconds from UTC. 32-bit integer representing the offset in seconds from UTC.
Unfortunately, the UTC offset option does not provide enough Unfortunately, the UTC offset option does not provide enough
information for an Internet client to determine such timezone-related information for an Internet client to determine such timezone-related
details as the timezone names, daylight savings time start and end details as the timezone names, daylight savings time start and end
times in addition to the timezone UTC offsets. times in addition to the timezone UTC offsets.
This document defines a new option which addresses these This document defines a new option which addresses these
shortcomings by delivering timezone information in the form of a shortcomings by delivering timezone information in the form of a
1003.1 POSIX Timezone specifier [4]. 1003.1 POSIX Timezone specifier [4]. Timely information regarding
timezones can be had at the U.S. Naval Observatory's web site [5].
Timezone 0ption Precedence Timezone 0ption Precedence
If a DHCP client receives both the Time Offset (code 2) and the If a DHCP client receives both the Time Offset (code 2) and the
POSIX Timezone (code 88) options in a DHCP reply message, the POSIX Timezone (code 88) options in a DHCP reply message, the
client MUST discard the value of the Time Offset (code 2) option and client MUST discard the value of the Time Offset (code 2) option and
utilize the POSIX Timezone Option. The DHCP client MAY notify the utilize the POSIX Timezone Option. The DHCP client MAY notify the
user that it is resolving the conflict by discarding the Time Offset user that it is resolving the conflict by discarding the Time Offset
(code 2) option. (code 2) option.
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[3] Droms, R., "Procedure for Defining New DHCP Options", Work in [3] Droms, R., "Procedure for Defining New DHCP Options", Work in
progress, February, 1996. progress, February, 1996.
[4] IEEE, "1003.1 POSIX Timezone Specification", 1988. [4] IEEE, "1003.1 POSIX Timezone Specification", 1988.
[5] http://tycho.usno.navy.mil, "U.S. Naval Observatory" [5] http://tycho.usno.navy.mil, "U.S. Naval Observatory"
Security Considerations Security Considerations
Security issues are not discussed in this document. Security issues are not relevant to this document.
Author's Address Author's Address
Mike Carney Mike Carney
Sun Microsystems, Inc. Sun Microsystems, Inc.
2 Elizabeth Drive 2 Elizabeth Drive
Chelmsford, MA 01824 Chelmsford, MA 01824
Phone: (508) 442-0469 Phone: (508) 442-0469
EMail: Mike.Carney@East.Sun.COM EMail: Mike.Carney@East.Sun.COM
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