Network Working Group K. Fujisawa Request for Comments: 2855 Sony Corporation Category: Standards Track June 2000 DHCP for IEEE 1394 Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2000). All Rights Reserved.
AbstractIEEE Std 1394-1995 is a standard for a High Performance Serial Bus. Since 1394 uses a different link-layer addressing method than conventional IEEE802/Ethernet, the usage of some fields must be clarified to achieve interoperability. This memo describes the 1394 specific usage of some fields of DHCP messages. RFC2734]. The Dynamic Host Configuration Protocol (DHCP) [RFC2131] provides a framework for passing configuration information to hosts on a TCP/IP network. Since 1394 uses a different link-layer addressing method than conventional IEEE802/Ethernet, the usage of some fields must be clarified to achieve interoperability. This memo describes the 1394 specific usage of some fields of DHCP. See [RFC2131] for the mechanism of DHCP and the explanations of each field. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].
ARPPARAM]. 'hlen' (hardware address length) MUST be 0. The 'chaddr' (client hardware address) field is reserved. The sender MUST set this field to zero, and the recipient and the relay agent MUST ignore its value on receipt. A DHCP client on 1394 SHOULD set a BROADCAST flag in DHCPDISCOVER and DHCPREQUEST messages (and set 'ciaddr' to zero) to ensure that the server (or the relay agent) broadcasts its reply to the client. Note: As described in [RFC2131], 'ciaddr' MUST be filled in with client's IP address during BOUND, RENEWING or REBINDING state, therefore, the BROADCAST flag MUST NOT be set. In these cases, the DHCP server unicasts DHCPACK message to the address in 'ciaddr'. The link address will be resolved by 1394 ARP. 'client identifier' option MUST be used in DHCP messages from the client to the server due to the lack of the 'chaddr'. 'client identifier' option may consist of any data. Because every IP over 1394 node has an EUI-64 (node unique ID), the EUI-64 makes an obvious 'client identifier'. 1394 clients SHOULD include an EUI-64 identifier in the 'client identifier' option. The type value for the EUI-64 is 27 [ARPPARAM], and the format is illustrated as follows.
Code Len Type Client-Identifier +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ | 61 | 9 | 27 | EUI-64 (node unique ID) | +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ Note that the use of other 'client identifier' type, such as a fully qualified domain name (FQDN), is not precluded by this memo. For more details, see "9.14. Client-identifier" in [RFC2132]. section 7 of the DHCP protocol specification [RFC2131]. A malicious client can falsify its EUI-64 identifier, thus masquerading as another client. [RFC2734] Johansson, P., "IPv4 over IEEE 1394", RFC 2734, December 1999. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, March 1997. [RFC2131] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March 1997. [RFC2132] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor Extensions", RFC 2132, March 1997. [ARPPARAM] http://www.iana.org/numbers.html
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