Internet DRAFT - draft-ahn-manet-centralized-dns
draft-ahn-manet-centralized-dns
MANET Working Group Sanghyun Ahn
Internet Draft University of Seoul
Expires: June 12, 2012 December 19, 2011
A Centralized MANET DNS Mechanism
draft-ahn-manet-centralized-dns-00.txt
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Abstract
This document describes a Domain Name System (DNS) mechanism for the
MANET based on the centralized DNS mechanism used in the wired
Internet. In order to adapt to the dynamic topology changes of the
MANET, the mechanism handles the movement of the DNS server and the
MANET merge/partition.
Table of Contents
1. Requirements notation . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Operations . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1 DNS Server Discovery . . . . . . . . . . . . . . . . . . . . . 3
4.2 Maintenance of Domain Names and Binding Information . . . . 4
4.3 Network Merge and Partition . . . . . . . . . . . . . . . . 4
5. Message Format . . . . . . . . . . . . . . . . . . . . . . . . 4
6. Other Considerations . . . . . . . . . . . . . . . . . . . . . 4
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Requirements notation
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. Introduction
The centralized DNS mechanism works based on unicast communications,
so it is more efficent in the resource-limited MANET than the
multicast-based DNS mechanisms proposed in [1][2].
However, the centralized DNS mechanism may confront with the
following problems in the MANET environment.
- the problem of server non-existence
- the problem of frequent updates of the IP address and domain name
bindings
In this draft, we describe how to adapt the centralized DNS mechanism
to the MANET by resolving the above mentioned problems.
3. Terminology
TBD.
4. Operations
4.1 DNS Server Discovery
MANET nodes discover the DNS server by sending the DSN Server
Solicitation and the DNS Server Advertisement messages. The node
wishing to obtain the address of the DNS server broadcasts a DNS
Server Solicitation message and waits for a DNS Server Advertisement
message from the DNS server. If no DNS Server Advertisement message
is received for the given time interval, the node assumes that there
is no DNS server and broadcasts a DNS Server Advertisement message to
announce itself as the DNS server. If there exists the DNS server,
the DNS server will receive the DNS Server Solicitation message and
unicasts a DNS Server Advertisement message to the requesting node
as a response. The DNS server is required to broadcast DNS Server
Advertisement messages periodically to announce its existence.
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4.2 Maintenance of Domain Names and Binding Information
A node registers its domain name by unicasting a DNS Register message
to the DNS server and the server determines whether the domain name
is already used by another node or not.
To request for the name service, a node unicasts a DNS Name Query
message to the DNS server and, then, the DNS server reponses to the
request by unicasting the corresponding DNS Name Response message.
If a node wants to change its domain name, it unicasts a DNS Name
Change message with its new domain name to the DNS server. If a node
wishes to leave the MANET, it sends a DNS Name Release message to
the DNS server.
4.3 Network Merge and Partition
If a node receives no DNS Server Advertisement message from the DNS
server for the given time interval, it assumes that the DNS server
does not exist in the network any more. Then, the node becomes the
new DNS server and broadcasts a DNS Server Advertisement message.
Due to node or DNS server movement, there may exist more than one
DNS server within the MANET. The multiple DNS server existence can be
detected by a DNS server when it receives a DNS Server Advertisement
message from another DNS server. In that case, only one DNS server
with the highest priority is chosen as the DNS server by using a
given tie breaking rule. The DNS server with a lower priority gives
up its role as the DNS server and hands over its DNS name table to
the highest priority DNS server by sending a DNS Register message.
5. Message Format
TBD.
6. Other Considerations
TBD.
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References
[1] S. Cheshire and M. Krochmal, "Multicast DNS," Internet Draft,
2005.
[2] J. Jeong, J. Park and H. Kim, "Name Service in IPv6 Mobile Ad-
hoc Network Connected to the Internet," IEEE PIMRC, pp.1351-1355,
2003.
Authors' Addresses
Sanghyun Ahn
University of Seoul
90, Cheonnong-dong, Tongdaemun-gu
Seoul 130-743
Korea
Email: ahn@uos.ac.kr
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