Network Working Group Vijayabhaskar A Kalusivalingam
Internet-Draft Hewlett-Packard
Expires: Jun 2004 Dec 2003
NIS Configuration Options for DHCPv6
draft-ietf-dhc-dhcpv6-opt-nisconfig-05
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Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes four options for Network Information Service
(NIS) related configuration information in DHCPv6: NIS Servers, NIS+
Servers, NIS Client Domain Name, NIS+ Client Domain name.
1. Introduction
This document describes four options for passing configuration
information related to Network Information Service (NIS) [3] in
DHCPv6 (RFC 3315 [1]).
2. Terminology
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 RFC2119 [2].
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Throughout this document, unless otherwise specified, the acronym
DHCP refers to DHCP as specified in RFC 3315.
This document uses terminology specific to IPv6 and DHCP as defined
in section "Terminology" of RFC 3315.
3. Network Information Service (NIS) Servers Option
The Network Information Service (NIS) Servers option provides a
list of one or more IPv6 addresses of NIS servers available to the
client. Clients MUST treat the list of NIS servers as an ordered
list. The server MAY list the NIS servers in the order of
preference.
The format of the Network Information Service Servers option is as
shown below:
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_NIS_SERVERS | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NIS_SERVERS (tbd)
option-len: Length of the 'NIS server' fields in octets; It must be
a multiple of 16
NIS server: IPv6 address of NIS server
4. Network Information Service V2 (NIS+) Servers Option
The Network Information Service V2 (NIS+) Servers option provides
a list of one or more IPv6 addresses of NIS+ servers available to
the client. Clients MUST treat the list of NIS+ servers as an
ordered list. The server MAY list the NIS+ servers in the order of
preference.
The format of the Network Information Service V2 (NIS+) Servers
option is as shown below:
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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_NISP_SERVERS | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS+ server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| NIS+ server (IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NISP_SERVERS (tbd)
option-len: Length of the 'NIS+ server' fields in octets; It must be
a multiple of 16
NIS+ server: IPv6 address of NIS+ server
5. Network Information Service (NIS) Domain Name Option
The Network Information Service (NIS) Domain Name option is used
by the server to convey client's NIS Domain Name info to the
client.
The format of the NIS Domain Name option is as shown below:
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_NIS_DOMAIN_NAME | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nis-domain-name |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NIS_DOMAIN_NAME (tbd)
option-len: Length of the 'nis-domain-name' field in octets
nis-domain-name: NIS Domain name for client
The 'nis-domain-name' MUST be encoded as specified in section
"Representation and Use of domain names" of the DHCPv6
specification [1].
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6. Network Information Service V2 (NIS+) Domain Name Option
The Network Information Service V2 (NIS+) Domain Name option is
used by the server to convey client's NIS+ Domain Name info to the
client.
The format of the NIS+ Domain Name option is as shown below:
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_NISP_DOMAIN_NAME | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| nisp-domain-name |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code: OPTION_NISP_DOMAIN_NAME (tbd)
option-len: Length of the 'nisp-domain-name' field in octets
nisp-domain-name: NIS+ Domain name for client
The 'nisp-domain-name' MUST be encoded as specified in section
"Representation and Use of domain names" of the DHCPv6
specification [1].
7. Appearance of these Options
The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
options MUST NOT appear in other than the following messages: Solicit,
Advertise, Request, Renew, Rebind, Information-Request and Reply.
The option number for these options MAY appear in the Option Request
Option [1] in the following messages: Solicit, Request, Renew,
Rebind, Information-Request and Reconfigure.
8. Security Considerations
The NIS servers, NIS+ servers, NIS domain name and NIS+ domain name
options may be used by an intruder DHCPv6 server to assign invalid
NIS parameters, resulting in clients unable to use NIS service.
The NIS servers and NIS+ servers options may be used by an intruder
DHCPv6 server to cause the DHCPv6 clients to send their queries to an
intruder NIS/NIS+ server. This misdirected searches may be used to
spoof NIS/NIS+ names.
The NIS domain name and NIS+ domain name options may be used by an
intruder DHCPv6 server to cause the DHCPv6 clients to search through
invalid domains for incompletely specified domain names. The results
of these misdirected searches may be used to spoof NIS/NIS+ names.
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To avoid attacks through these options, the DHCPv6 client SHOULD use
authenticated DHCP (see section "Authentication of DHCP messages" in
the DHCPv6 specification [1]).
9. IANA Considerations
IANA is requested to assign an option code to the following options
from the option-code space defined in "DHCPv6 Options" section of the
DHCPv6 specification [1].
Option Name Value Described in
OPTION_NIS_SERVERS tbd Section 3
OPTION_NISP_SERVERS tbd Section 4
OPTION_NIS_DOMAIN_NAME tbd Section 5
OPTION_NISP_DOMAIN_NAME tbd Section 6
10. Normative References
[1] Bound, J., Carney, M., Perkins, C., Lemon, T., Volz, B. and R.
Droms (ed.), "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", RFC 3315, July 2003.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
11. Informative References
[3] Sun Microsystems, "System and Network Administration",
March 1990.
Author's Address
Vijayabhaskar A Kalusivalingam
Hewlett-Packard STSD-I
29, Cunningham Road
Bangalore - 560052
India
Phone: +91-80-2053085
E-Mail: vijayak@india.hp.com
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society. Thanks to the DHC Working Group for their time and
input into the specification. In particular, thanks to (in
alphabetical order) Bernie Volz, Jim Bound, Margaret Wasserman, Pekka
Savola, Ralph Droms and Thomas Narten for their thorough review.
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