IP Version 6 Addressing Architecture

With a an ipv6 packet source address of unspecified

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Unformatted text preview: address 0:0:0:0:0:0:0:1 is called the loopback address. It may be used by a node to send an IPv6 packet to itself. It must not be assigned to any physical interface. having It is treated as Link-Local scope, and may be thought of as the Link-Local unicast address of a virtual interface (typically called the "loopback interface") to an imaginary link that goes nowhere. The loopback address must not be used as the source address in IPv6 packets that are sent outside of a single node. packet with An IPv6 a destination address of loopback must never be sent outside of a single node and must never be forwarded by an IPv6 router. packet A received on an interface with a destination address of loopback must be dropped. 2.5.4. Global Unicast Addresses The general format for IPv6 Global Unicast addresses is as follows: | | n bits | m bits | 128-n-m bits +------------------------+----------+----------------------------+ | global routing prefix | | subnet ID | interface ID +------------------------+----------+----------------------------+ where the global routing prefix is a (typically hierarchically- structured) value assigned to a site (a cluster of subnets/links), the subnet ID is an identifier of a link within the site, and the interface ID is as defined in Section 2.5.1. Hinden [Page 9] Standards Track RFC 4291 February 2006 IPv6 Addressing Architecture All Global Unicast addresses other than those that start with binary 000 ha...
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