dhc Working Group Mayumi Yanagiya
Internet Draft NTT
Expires: August 14,2005 February 14, 2005
IA type for Mobile IPv6 bootstrapping
draft-yanagiya-iatype-mip6boot-00.txt
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Copyright (C) The Internet Society (2005). All Rights Reserved.
Abstract
When we use DHCPv6 to bootstrap Mobile IPv6 service, stateful DHCP
should be used to assign the home address. In [RFC3315], two types of
IA are specified: IA_NA and IA_TA. When stateful DHCPv6 is used in a
local network, the "care-of address" is carried as one of the IA_NA
options. On the other hand, when autoconfiguration [FRC2462] is used,
care-of address is generated on mobile node and there is no way to
assign home address stateful. Thus, we introduce a new IA type to
assign the home address.
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In this document we specify a new IA type for assigning the home
address. We describe DHCP options for assigning Mobile IPv6
bootstrapping information such as the home address and home agentÆs
address.
Table of Contents
1. Introduction..................................................2
2. Terminology...................................................2
3. Background....................................................2
4. IA type and DHCP options for Mobile IPv6 bootstrapping.........3
4.1. IA type for home address assignment......................3
4.2. IA_Home Option...........................................3
4.3. IA Home Address Option.....................................4
4.4. IA Home Agent Address Option...............................5
5. Security considerations........................................5
6. IANA considerations............................................6
7. Informative references........................................6
Author's address..................................................6
1. Introduction
When we use DHCPv6 to bootstrap Mobile IPv6 service, stateful DHCP
should be used to assign the home address. In [RFC3315], two types of
IA are specified: IA_NA and IA_TA. When stateful DHCPv6 is used in a
local network, the "care-of address" is carried as one of the IA_NA
options. On the other hand, when autoconfiguration [FRC2462] is used,
care-of address is generated on mobile node and there is no way to
assign home address stateful. Thus, we introduce a new IA type to
assign the home address.
In this document we specify a new IA type for assigning the home
address. We describe DHCP options for assigning Mobile IPv6
bootstrapping information such as the home address and home agentÆs
address.
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[1].
Most of terms used in this draft are defined in Mobile IPv6[MIP6]
and RFC3315[RFC3315], RFC3633[RFC3633].
3. Background
In [RFC3315], two types of IA are specified for assigning the
address: IA_NA and IA_TA. When a mobile node is in a network where
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stateful DHCPv6 is used to assign the address (care-of address for
the mobile node), the mobile node can use the IA address option to
obtain the care-of address. The DHCP server may assign the home
address as one of the IAaddr-options. In that case, some issues
should be considered.
o For mobile node handoff to another attachment point, the mobile
node may use DHCP to obtain the new care-of address. At this time,
the mobile node has to change home address and home agent.
o The DHCPv6 server cannot maintain the state of the home address
explicitly.
o When DHCP is used in the home network, the mobile node can be
assigned the home address by means of several different options.
On the other hand, when IPv6 address autoconfiguration is used in a
local network, there is no IA type for obtaining home address.
4. IA type and DHCP options for Mobile IPv6 bootstrapping
4.1. IA type for home address assignment
We introduce a new IA type to assign home network parameters such
as the home address and the IP address of the home agent. This IA
type is called IA_Home.
4.2. IA_Home Option
The IA_Home option is used to carry the parameters that are used in
the home network.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IA_Home | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IAID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| T1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| T2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
: IA_Home-options :
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code OPTION_IA_Home (TBD).
option-len 12 + length of IA_Home-options field.
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IAID The unique identifier for this IA_Home; the
IAID must be unique among the identifiers for all
of this client's IA_Home options.
The number space for IA_Home IAIDs is separate
from the number space for IA_TA IAIDs and
IA_NA IAIDs.
T1 The time at which the client contacts the server
from which the address in the IA_Home
was obtained to extend the lifetimes of the
address assigned to the IA_Home; T1 is a
time duration relative to the current time
expressed in units of seconds.
T2 The time at which the client contacts any available
server to extend the lifetimes of the addresses
assigned to IA_Home; T2 is a time duration relative
to the current time expressed in units of seconds.
IA_Home-options Options associated with this IA_Home.
4.3. IA Home Address Option
The IA_Home_Address option is used to assign the home IPv6 address
associated with an IA_Home. The IA_Home_Address option must be
encapsulated in the IA_Home-options field of an IA_Home option. The
IA_HoA-options field encapsulates those options that are specific to
the home address. The format of the IA Home Address option is:
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_HoA | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Home address(IPv6 address) |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| preferred-lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| valid-lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. .
. IA HoA-options .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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option-code OPTION_HoA (TBD)
option-len 24 + length of IA HoA-options field.
Home address A home address (IPv6 address).
preferred-lifetime The preferred lifetime for the home address
in the option, expressed in units of
seconds.
valid-lifetime The valid lifetime for the home address in the
option, expressed in units of seconds.
IA HoA-options Options associated with home address.
4.4. IA Home Agent Address Option
The IA Home Agent Address Option is sent by a server to a client to
assign the IPv6 address of the home agent (HA) to the mobile node.
The IA_Home_Agent_Address option is encapsulated in the IA HoA-
options field. The format of the Preference option is:
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_IA_HAaddr | option-len |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| IPv6 address of HA |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code OPTION_IA_HAaddr.(TBD)
option-len 16.
IPv6 address of HA The IP address of the home agent with which
the mobile node should register the Binding
update.
5. Security considerations
Secure delivery of the home agentÆs address and the home address
from a DHCP server to the mobile node (DHCP client) relies on the
overall DHCP security. The particular option defined in this draft
does not have any additional impact on DHCP security.
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6. IANA considerations
This document introduces new DHCPv6 options and a new IA type. The
type numbers for option-code are currently TBD. An appropriate
request will be made to IANA if this Internet draft gets accepted as
an RFC.
7. Informative references
[MIP6]D.Johnson et al, "Mobility Support in IPv6",RFC3775, June 2004
[RFC3315]R.Dorms Ed, "Dynamic Host Configuration Protocol for IPv6
(DHCPv6) ", July 2003
[I-D.draft-ohba-mip6-boot-arch-dhcp] Y.Ohba, M.Yanagiya, et al.
"Mobile IPv6 Bootstrapping Architecture Using DHCP", draft-ohba-mip6-
boot-arch-dhcp-00, October 17, 2004
[RFC2462]S. Thomson, T. Narten, "IPv6 Stateless Address
Autoconfiguration",RFC2462,December 1998
Author's address
Mayumi Yanagiya
NTT Network Service Systems Laboratories
3-9-11 Midori-cho, Musashino-shi
Tokyo, Japan
Phone: 81-422-596783
Email: yanagiya.mayumi@lab.ntt.co.jp
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