Internet Protocol, Version 6 (IPv6) Specification

Abstract

Internet Protocol, Version 6 (IPv6) Specification Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Mobility Support in IPv6

“…When sending a packet to any IPv6 destination, the correspondent node checks its cached bindings for an entry for the packet's destination address. If a cached binding for this destination address is found, the node uses a new type of IPv6 routing header [11] (see Section 6.4) to route the packet to the mobile node by way of the care-of address indicated in this binding.…”

“…The pseudo-header contains IPv6 header fields, as specified in Section 8.1 of RFC 2460 [11]. The Next Header value used in the pseudo-header is 2.…”

“…If a mobility message has a Home Address destination option, then the checksum calculation uses the home address in this option as the value of the IPv6 Source Address field. The type 2 routing header is treated as explained in [11].…”

“…Following the convention in IPv6, these options are aligned in a packet so that multi-octet values within the Option Data field of each option fall on natural boundaries (i.e., fields of width n octets are placed at an integer multiple of n octets from the start of the header, for n = 1, 2, 4, or 8) [11]. Normally, a Binding Update specifies the desired care-of address in the Source Address field of the IPv6 header.…”

“…Without specific support for mobility in IPv6 [11], packets destined to a mobile node would not be able to reach it while the mobile node is away from its home link. In order to continue communication in spite of its movement, a mobile node could change its IP address each time it moves to a new link, but the mobile node would then not be able to maintain transport and higher-layer connections when it changes location.…”