In IPv6, Neighbor Discovery is the primary protocol for local IP subnet conguration.
There are three basic functions involved in Neighbor Discovery: discovering access routers and subnet conguration information like subnet prexes on the link; resolving an IP address to a link layer address for last hop packet delivery; autoconguring an IP address and checking whether any other node on the link has already claimed that address.
Neighbor Discovery uses the IPv6 version of Internet Control Message Protocol (ICMP) for the transport layer. The protocols for the Neighbor Discovery functions are discussed in the following sections.
When a wireless IPv6 terminal initially connects to a link, thestep in local link subnet conguration is to an access router. The access router provides the terminal with subnet conguration information about the link. This information includes.
The link local IP address and link layer address of the router. This allows the terminal to route trafc off of the local link and to the Internet.
An indication of whether the terminal should use DHCP or address autoconguration to obtain its IP address, and whether other subnet conguration information such as the address of a DNS server is available through DHCP.
A set of subnet prexes that can be used to autocongure IP addresses, as described below.
A collection of other information useful for managing the default router selection and address conguration.
Router discovery is a request/response protocol that provides a set of two messages.
Router Solicitation (RS) and Router Advertisement (RA). The RS is multicast by the terminal to a multicast address monitored by all access routers on the subnet. The RS requests information on the access routers. The RA is a unicast reply containing that information. Note that these messages are also available in IPv4 but are typically not used strictly for router discovery.
In IPv6, Neighbor Discovery is the primary protocol for local IP subnet conguration.
There are three basic functions involved in Neighbor Discovery: discovering access routers and subnet conguration information like subnet prexes on the link; resolving an IP address to a link layer address for last hop packet delivery; autoconguring an IP address and checking whether any other node on the link has already claimed that address.
Neighbor Discovery uses the IPv6 version of Internet Control Message Protocol (ICMP) for the transport layer. The protocols for the Neighbor Discovery functions are discussed in the following sections.
When a wireless IPv6 terminal initially connects to a link, thestep in local link subnet conguration is to an access router. The access router provides the terminal with subnet conguration information about the link. This information includes.
The link local IP address and link layer address of the router. This allows the terminal to route trafc off of the local link and to the Internet.
An indication of whether the terminal should use DHCP or address autoconguration to obtain its IP address, and whether other subnet conguration information such as the address of a DNS server is available through DHCP.
A set of subnet prexes that can be used to autocongure IP addresses, as described below.
A collection of other information useful for managing the default router selection and address conguration.
Router discovery is a request/response protocol that provides a set of two messages.
Router Solicitation (RS) and Router Advertisement (RA). The RS is multicast by the terminal to a multicast address monitored by all access routers on the subnet. The RS requests information on the access routers. The RA is a unicast reply containing that information. Note that these messages are also available in IPv4 but are typically not used strictly for router discovery.
access point vs router
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