Internet DRAFT - draft-daniel-manet-dns-discovery-globalv6
draft-daniel-manet-dns-discovery-globalv6
Mobile Ad Hoc Network Working Group S. Daniel Park
INTERNET-DRAFT Samsung Electronics
Expires: September 28, 2004 March 29, 2004
DNS Discovery for global connectivity in IPv6 Mobile Ad Hoc Networks
<draft-daniel-manet-dns-discovery-globalv6-00.txt>
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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Abstract
This document proposes the mechanism of DNS Discovery for
global connectivity based on modified manet Router Advertisement
message in IPv6 mobile ad hoc networks.
1. Introduction
The global connectivity in IPv6 mobile ad hoc networks is often
required for manet nodes desiring communication with the fixed
Internet [GLOBALv6]. For global connectivity, manet nodes have
unique global address which is used for communication to the
Internet. This address is typically resolved from a DNS name. DNS
resolution is a vital service for a host connected to an IPv6
network.
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This document describes the process of DNS Discovery based on
IPv6 Router Advertisement (RA) to find out the address of DNS server
in IPv6 Mobile Ad hoc Networks and defines new manet DNS resolver
option in modified manet Router Advertisement [GLOBALv6]. The Manet
DNS reslover option will allow any manet nodes to discover IPv6
addresses of DNS resolvers (with preference to global-unicast
addresses). The purpose is also to enhance the efficiency of global
connectivity [GLOBALv6] when internet-gateway does not provide proxy
DNS function.
1.1 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 RFC 2119 [RFC
2119].
o DNS Discovery The process of manet nodes to find out
the address of DNS server, typically
recursive DNS server addresses in the
Internet. The addresses are used for
manet nodes to obtain global addresses
from a DNS name.
o Manet DNS resolver (MDNSR) option
The Manet DNS resolver option contains
the DNS server addresses in modified
manet Router Advertisement message.
o internet-gateway A router which provides Internet
connectivity for nodes in the manet.
This router is located at the edge of
manet and has a connection to both the
Internet and the manet. (is described
in [GLOBALv6].
2. Overview
Likewise generally IPv6 networks, an internet-gateway sends out a
manet Router Advertisement message either periodically or response
to a manet Router Solicitation. Moreover, the internet-gateway
allows to send unsolicited manet Router Advertisements, although
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sending them periodically would generate unnecessary packets in
manet. After manet nodes obtain global address, DNS queries, web
browsing and that kind of services can be used in manet. The MDNSR
option provides a standard mechanism for advertising DNS resolver
IPv6 addresses with current manet Router Advertisement in manet.
3. MANET DNS Resolve Option
The MDNSR option contains the IPv6 address of DNS server. When
advertising more than one MDNSR option, as many MDNSR options as DNS
servers are included in a MANET Router Advertisement message.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Pref | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ IPv6 Address of DNS Server +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fields:
o Type 11
o Length 8-bit unsigned integer. The length of option
(including the type and length fields). The value 0
is invalid. Nodes MUST silently discard a MANET
Router Advertisement message that contains an option
with length zero.
o Pref The preference of a DNS server. A 4 bit unsigned
integer. A decimal value of 15 indicates the highest
preference. A decimal value of 0 indicates that the
DNS server can not be used. The field can be used
for load balancing of DNS queries with multiple
recursive DNS servers according to local policy.
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o IPv6 Address of DNS Server
Recursive DNS Server's address for DNS name
resolution.
MDNSR option MUST be silently ignored for other Neighbor Discovery
messages.
4. Security Considerations
This security is essentially related to Neighbor Discovery Protocol
security [DISCOVERY] and the security section in [GLOBALv6].
Security issues regarding the Neighbor Discovery Protocol are being
discussed in SEND (Secure Neighbor Discovery) Working Group in IETF.
5. References
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[GLOBALv6] Wakikawa. R. et. al., "Global connectivity for IPv6
Mobile Ad Hoc Networks", Internet Draft, November 2002.
[DNSRA] Jeong, J., et. al., "IPv6 DNS Discovery based on Router
Advertisement", Internet Draft, July 2003.
[DISCOVERY] Narten, T., "Neighbor Discovery for IPv6", RFC 2461,
December 1998.
Author's Address
Soohong Daniel Park
Mobile Platform Laboratory,
SAMSUNG Electronics
Korea
Phone: +82-31-200-4508
EMail: soohong.park@samsung.com
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