draft-ietf-ip1394-dhcp-02.txt   draft-ietf-ip1394-dhcp-03.txt 
Internet-Draft K. Fujisawa Internet-Draft K. Fujisawa
<draft-ietf-ip1394-dhcp-02.txt> Sony Corporation <draft-ietf-ip1394-dhcp-03.txt> Sony Corporation
Expires: February, 2000 August 1999 Expires: August, 2000 February 2000
DHCP for IEEE 1394 DHCP for IEEE 1394
Status of this memo Status of this memo
This document is an Internet-Draft and is in full conformance This document is an Internet-Draft and is in full conformance
with all provisions of Section 10 of RFC2026. with all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
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documents at any time. It is inappropriate to use Internet- documents at any time. It is inappropriate to use Internet-
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"work in progress." "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract Abstract
IEEE Std 1394-1995 is a standard for a High Performance Serial Bus. IEEE Std 1394-1995 is a standard for a High Performance Serial Bus.
Since 1394 uses different link-layer addressing method than Since 1394 uses a different link-layer addressing method than
conventional IEEE802/Ethernet, the usage of some fields must be conventional IEEE802/Ethernet, the usage of some fields must be
clarified to achieve interoperability. clarified to achieve interoperability.
This memo describes the 1394 specific usage of some fields of DHCP This memo describes the 1394 specific usage of some fields of DHCP
messages. messages.
1. Introduction 1. Introduction
IEEE Std 1394-1995 is a standard for a High Performance Serial Bus. IEEE Std 1394-1995 is a standard for a High Performance Serial Bus.
IETF IP1394 Working Group specified the method to carry IPv4 IETF IP1394 Working Group specified the method to carry IPv4
datagrams and ARP packets over an IEEE1394 network [IP1394]. datagrams and 1394 ARP packets over an IEEE1394 network [RFC2734].
The Dynamic Host Configuration Protocol (DHCP) [RFC2131] provides a The Dynamic Host Configuration Protocol (DHCP) [RFC2131] provides a
framework for passing configuration information to hosts on a TCP/IP framework for passing configuration information to hosts on a TCP/IP
network. network.
Since 1394 uses different link-layer addressing method than Since 1394 uses a different link-layer addressing method than
conventional IEEE802/Ethernet, the usage of some fields must be conventional IEEE802/Ethernet, the usage of some fields must be
clarified to achieve interoperability. clarified to achieve interoperability.
This memo describes the 1394 specific usage of some fields of DHCP. This memo describes the 1394 specific usage of some fields of DHCP.
See [RFC2131] for the mechanism of DHCP and the explanations of each See [RFC2131] for the mechanism of DHCP and the explanations of each
fields. field.
This document is a product of the IP1394 working group within the This document is a product of the IP1394 working group within the
Internet Engineering Task Force. Comments are solicited and should Internet Engineering Task Force. Comments are solicited and should
be addressed to the working group's mailing list at be addressed to the working group's mailing list at
ip1394@mailbag.intel.com and/or the author. ip1394@mailbag.intel.com and/or the author.
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].
2. Issues related to 1394 link address 2. Issues related to 1394 link address
By the conventional link-layer protocols, such as an Ethernet, the With conventional link-layer protocols, such as an Ethernet, the
'chaddr' (client hardware address) field may be used to return a 'chaddr' (client hardware address) field may be used to return a
reply message from a DHCP server (or relay-agent) to a client. Since reply message from a DHCP server (or relay-agent) to a client. Since
1394 link address (node_ID) is transient and will not be consistent a 1394 link address (node_ID) is transient and will not be consistent
across the 1394 bridge, we have chosen not to put it in the 'chaddr' across the 1394 bridge, we have chosen not to put it in the 'chaddr'
field. A DHCP client should request the server to send a broadcast field. A DHCP client should request that the server sends a
reply by setting the BROADCAST flag when ARP is not possible yet. broadcast reply by setting the BROADCAST flag when 1394 ARP is not
possible yet.
Note: In general, the use of a broadcast reply is discouraged, Note: In general, the use of a broadcast reply is discouraged,
but we consider the impact in a 1394 network is not an issue. but we consider the impact in a 1394 network as a non issue.
3. 1394 specific usage of DHCP message fields 3. 1394 specific usage of DHCP message fields
Following rules should be used when a DHCP client is connected to Following rules should be used when a DHCP client is connected to
an IEEE1394 network. an IEEE1394 network.
'htype' (hardware address type) MUST be 24 [ARPPARAM]. 'htype' (hardware address type) MUST be 24 [ARPPARAM].
'hlen' (hardware address length) MUST be 0. 'hlen' (hardware address length) MUST be 0.
The 'chaddr' (client hardware address) field is reserved. The The 'chaddr' (client hardware address) field is reserved. The sender
recipient shall not check the value of this field. MUST set this field to zero, and the recipient and the relay agent
MUST ignore its value on reciept.
A DHCP client on 1394 SHOULD set a BROADCAST flag in DHCPDISCOVER and A DHCP client on 1394 SHOULD set a BROADCAST flag in DHCPDISCOVER and
DHCPREQUEST messages to request the server (or the relay agent) to DHCPREQUEST messages (and set 'ciaddr' to zero) to ensure that the
send a broadcast reply if its 'ciaddr' (client IP address) is zero. server (or the relay agent) broadcasts its reply to the client.
Note: As described in [RFC2131], 'ciaddr' MUST be filled in with Note: As described in [RFC2131], 'ciaddr' MUST be filled in with
client's IP address during BOUND, RENEWING or REBINDING state, client's IP address during BOUND, RENEWING or REBINDING state,
therefore, the BROADCAST flag MUST NOT be set. In these cases, therefore, the BROADCAST flag MUST NOT be set. In these cases,
the DHCP server unicasts DHCPACK message to the address in the DHCP server unicasts DHCPACK message to the address in
'ciaddr'. The link address will be resolved by ARP. 'ciaddr'. The link address will be resolved by 1394 ARP.
'client identifier' option MUST be used in DHCP messages from the 'client identifier' option MUST be used in DHCP messages from the
client to the server due to the lack of the 'chaddr'. 'client client to the server due to the lack of the 'chaddr'. 'client
identifier' option may consist of any data. Every IP over 1394 node identifier' option may consist of any data. Because every IP over
has an EUI-64 (node unique ID) [EUI64], it is useful for a 'client 1394 node has an EUI-64 (node unique ID) [EUI64], the EUI-64 makes an
identifier'. When an EUI-64 is used as a 'client identifier', the obvious 'client identifier'. 1394 clients SHOULD include an EUI-64
type value for the EUI-64 is 27 [ARPPARAM], and the format is identifier in the 'client identifier' option. The type value for the
illustrated as follows. EUI-64 is 27 [ARPPARAM], and the format is illustrated as follows.
Code Len Type Client-Identifier Code Len Type Client-Identifier
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 61 | 9 | 27 | EUI-64 (node unique ID) | | 61 | 9 | 27 | EUI-64 (node unique ID) |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Note that the use of other 'client identifier' type, such as a fully Note that the use of other 'client identifier' type, such as a fully
qualified domain name (FQDN), is not precluded by this memo. qualified domain name (FQDN), is not precluded by this memo.
For more details, see "9.14. Client-identifier" in [RFC2132]. For more details, see "9.14. Client-identifier" in [RFC2132].
Security Considerations 4. Security Considerations
Security issues are not discussed in this document. DHCP currently provides no authentication or security mechanisms.
Potential exposures to attack are discussed in section 7 of the DHCP
protocol specification [RFC2131].
A malicious client can falsify its EUI-64 identifier, thus
masquerading as another client.
Acknowledgments Acknowledgments
The author appreciates the members of the Dynamic Host Configuration The author appreciate the members of the Dynamic Host Configuration
working group for their review and valuable comments. working group for their review and valuable comments.
References References
[IP1394] P. Johansson, "IPv4 over IEEE 1394", [RFC2734] P. Johansson, "IPv4 over IEEE 1394",
draft-ietf-ip1394-ipv4-15.txt, work in progress. RFC2734, December 1999.
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", RFC2119, March 1997.
[RFC2131] R. Droms, "Dynamic Host Configuration Protocol", RFC2131, [RFC2131] R. Droms, "Dynamic Host Configuration Protocol", RFC2131,
March 1997. March 1997.
[RFC2132] S. Alexander, R. Droms, "DHCP Options and BOOTP Vendor [RFC2132] S. Alexander, R. Droms, "DHCP Options and BOOTP Vendor
Extensions", RFC2132, March 1997. Extensions", RFC2132, March 1997.
[EUI64] http://standards.ieee.org/regauth/oui/tutorials/EUI64.html [EUI64] http://standards.ieee.org/regauth/oui/tutorials/EUI64.html
[ARPPARAM] http://www.isi.edu/in-notes/iana/assignments/arp-parameters [ARPPARAM] http://www.isi.edu/in-notes/iana/assignments/arp-parameters
Author's address Author's address
Kenji Fujisawa Kenji Fujisawa
Sony Corporation Sony Corporation
6-7-35, Kitashinagawa, 6-7-35, Kitashinagawa,
Shinagawa-ku, Tokyo, 141-0001 Japan Shinagawa-ku, Tokyo, 141-0001 Japan
Phone: +81-3-5448-8507 Phone: +81-3-5448-8507
E-mail: fujisawa@sm.sony.co.jp E-mail: fujisawa@sm.sony.co.jp
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[ARPPARAM] http://www.isi.edu/in-notes/iana/assignments/arp-parameters [ARPPARAM] http://www.isi.edu/in-notes/iana/assignments/arp-parameters
Author's address Author's address
Kenji Fujisawa Kenji Fujisawa
Sony Corporation Sony Corporation
6-7-35, Kitashinagawa, 6-7-35, Kitashinagawa,
Shinagawa-ku, Tokyo, 141-0001 Japan Shinagawa-ku, Tokyo, 141-0001 Japan
Phone: +81-3-5448-8507 Phone: +81-3-5448-8507
E-mail: fujisawa@sm.sony.co.jp E-mail: fujisawa@sm.sony.co.jp
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