Network Working Group K. Chowdhury
Internet-Draft Nortel Networks
Expires: December 23, 2004 P. Yegani
Cisco Systems
L. Madour
Ericsson
June 24, 2004
DHCPv6 Options for Broadcast and Multicast Control Servers
draft-chowdhury-dhc-bcmcv6-option-00.txt
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Abstract
This document defines new options for Broadcast and Multicast Service
controller discovery in an IP network. Broadcast and Multicast
service over 3G wireless networks are being developed at the time of
writing this document. Users of this service interact with a
controller in the network to derive informations that are required to
receive broadcast service. Dynamic Host Configuration Protocol can
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be used to configure the controller IPv6 addresses in the user's
devices. This document defines the related options and option codes.
Table of Contents
1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Broadcast Service Controller Options . . . . . . . . . . . . . 7
4.1 Broadcast Service Controller Domain Name List option . . . 7
4.2 Broadcast Service Controller IPv6 address option . . . . . 8
5. Consideration for Client Operation . . . . . . . . . . . . . . 9
6. Consideration for Server Operation . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13
10. Normative References . . . . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 13
Intellectual Property and Copyright Statements . . . . . . . . 15
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1. Motivation
Dynamic Host Configuration Protocol can be used to configure various
non-IP address type of parameters. These parameters are required for
normal operation of various services that are offered over an IP
network.
In 3G wirelesss network standards body such as 3GPP2 (www.3gpp2.org),
broadcast and multicast service is being developed [BCMCS]. The
service includes a controller component that is responsible for
managing the service via interaction with the users and other network
entities. The users of the service are required to know the IPv6
address of the controller entity so that they can download all the
necessary information about a desired broadcast program. In a
roaming environment static configuration of the controller IPv6
address becomes unrealistic. Therefore, DHCP [RFC3315] is considered
to be a method to dynamically configure controller IPv6 address in
the user's devices in the 3G wireless networks. DHCP can also be
used to convey the fully qualified domain name of the broadcast
service controller to the user. The user in turn makes DNS queries
to obtain the IPv6 address of the associated broadcast service
controller.
In order to allow the users to discover the broadcast controllers,
the clients need to request for appropriate option codes from the DHC
servers using Option-Request-Option and the DHC servers need to
return corresponding configuration options that carry the broadcast
and multicast service controller IPv6 address or Domain Name list.
The motivation for this document is to define the necessary options
and option codes.
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2. Overview
The Broadcast and Multicast Service architecture in a 3G wireless
network such as 3GPP2 has the following model:
Control Info +------------+ +--------+
+---------------------->| | | |
| HTTP+XML | Controller | | DHCP |
| | | | Server |
| +------------+ +--------+
| | |
| Control| | Control
| Info| | Info
| | +---------------+
| | |
| +-------+ |
| | | |
| | AAA | |
| | | |
| +-------+ |
| | |
| Control| |
| Info| |
V | V
+----+ +------------+ +------------+ +------------+
| | | | | | | |
| MN/| bearer | Radio | | Access | | Broadcast |
|User|<-------| Access |<---| Gateway |<---| Content |
| | | Network | | | | Server |
+----+ +------------+ +------------+ +------------+
Note that this inforamtive figure is shown here for broad
understanding of how Broadcast and Multicast service works in a 3G
radio network. The network elements except MN/user and the DHCP
server are not relevant to the text in this document.
The user interacts with the Controller to request for broadcast/
multicast program information from the network (e.g., scheduled time,
multicast IP address, port numbers). The User may also be
authenticated by the Controller while downloading the relevant
program security related information (such as encryption key). These
interactions happen via HTTP and XML. For details of Broadcast and
Multicast Service operation in 3GPP2, see [BCMCS]. There may be more
than one controller in the network. The user should discover the
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appropriate controller to request the relevant program information.
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3. Terminology
The keywords "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.
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4. Broadcast Service Controller Options
This section defines the configuration options for the controller of
Broadcast Service. The options in the document are specified similar
to [RFC3319].
4.1 Broadcast Service Controller Domain Name List option
The option length is followed by a sequence of labels, encoded
according to Section 3.1 of RFC 1035 [5].
The option MAY contain multiple domain names, but these domain names
SHOULD be used to construct SRV lookups as specified in [BCMCS],
rather than querying for different A records. The client MUST try
the records in the order listed, applying the mechanism described in
[BCMCS] for each entry. The client only resolves the subsequent
domain names if attempts to contact the first one failed or yielded
no common transport protocols between the client and the controller
or denote a domain administratively prohibited by client's policy.
Use of multiple domain names is not meant to replace the SRV records,
but rather to allow a single DHCP server to indicate the broadcast
controllers in the access provider's network. Clients MUST support
compression according to the encoding in Section 4.1.4 of "Domain
Names - Implementation And Specification .
The DHCPv6 option for Boradcast Service Controller Domain Names has
the format shown below.
option-code: OPTION_BCMCS_SERVER_D (TBD)
option-length: Length of the 'Broadcast Control Server Domain Name
List' field in octets; variable.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_BCMCS_SERVER_D | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Broadcast Control Domain Name List |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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4.2 Broadcast Service Controller IPv6 address option
This DHCP option SHALL carry one or more 128-bit IPv6 address(es) of
the Broadcast Service Controller in a operators network.
option-code: OPTION_BCMCS_SERVER_A (TBD)
option-length: Length of the 'Broadcast Control Server IPv6 address'
field in octets; variable.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| OPTION_BCMCS_SERVER_A | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Broadcast Control server-1 address (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Broadcast Control server-2 address (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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5. Consideration for Client Operation
A client MAY request either or both of the Broadcast Service
Controller Domain Name List and the IPv6 Address options in the
Options Request Option (ORO) as described in [RFC3315].
If a client receives both the Broadcast Service Controller Domain
Name List and IPv6 Address options, it SHOULD use the Domain Name
List option. In this case, the client MAY use the Broadcast Service
Controller IPv6 Address option only if, no server in the Broadcast
Service Controller Domain Name List can be resolved or reached.
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6. Consideration for Server Operation
A server MAY send a client one or both of the Broadcast Service
Controller Domain Name List and Broadcast Service Controller IPv6
Address options if the server is configured to do so.
If a client requests both options and the server is configured with
both types of information, the server MAY send the client only one of
these options if it is configured to do so. In this case the server
SHOULD send the Broadcast Service Controller Domain Name List option.
A server configured with the Broadcast Service Controller IPv6
Address information MUST send a client the Broadcast Service
Controller IPv6 Address option if that client requested only the
Broadcast Service Controller IPv6 address option and not the
Broadcast Service Controller Domain Name List option in the ORO
(RFC3315]).
If a client requests for the Broadcast Service Controller IPv6 option
and the Server is configured only with the Domain Names, the Server
MUST return the Domain Names List and vice versa.
The following table summarizes the server's response:
Client sends in ORO Domain Name List IPv6 Address List
__________________________________________________________________
Neither option SHOULD MAY
Domain Name List MUST MAY
IPv6 Address MAY MUST
Both options SHOULD MAY
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7. Security Considerations
The security considerations in the base DHCPv6 spec [RFC3315]
applies. An attacker may change information of the Broadcast Service
Controller in packets that are in-tranist from DHCP server to the MN,
if integrity protection is not in place. In that event, the user of
the Broadcast service may be diverted to a rogue broadcast service
controller. In the absence of a mutual authentication procedure
between MN and the Broadcast controller, the MN may receive wrong or
fraudulent information about Broadcast Service.
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8. IANA Considerations
The option codes OPTION_BCMCS_SERVER_A, OPTION_BCMCS_SERVER_D for
Broadcast Service Controller Domain Name list and IPv6 address
respectively Must be assigned by IANA.
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9. Acknowledgements
Thanks to the follwoing indivduals for their review and constructive
comments during the development of this document:
AC Mahendran, Jun Wang, Raymond Hsu, Jayshree Bharatia.
10 Normative References
[BCMCS] 3GPP2, www.3gpp2.org, "X.P0022, Broadcast and Multicast
Service in cdma2000 Wireless IP Network.", October 2003.
[RFC1035] Mockapetris, P., "Domain names - implementation and
specification", STD 13, RFC 1035, November 1987.
[RFC3315] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C. and
M. Carney, "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", RFC 3315, July 2003.
[RFC3319] Schulzrinne, H. and B. Volz, "Dynamic Host Configuration
Protocol (DHCPv6) Options for Session Initiation Protocol
(SIP) Servers", RFC 3319, July 2003.
Authors' Addresses
Kuntal Chowdhury
Nortel Networks
2221 Lakeside Blvd.
Richardson, TX 75082
US
Phone: +1 972-685-7788
EMail: chowdury@nortelnetworks.com
Parviz Yegani
Cisco Systems
3625 Cisco Way
San Jose, CA 95134
US
Phone: +1 408-832-5729
EMail: pyegani@cisco.com
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Lila Madour
Ericsson
8400, Decarie Blvd
Town of Mount Royal, Quebec H4P 2N2
CANADA
Phone: +1 514-345-7900
EMail: Lila.Madour@ericsson.com
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