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https://www.7key.jp/rfc/1981/rfc1981_2.html#source
https://www.7key.jp/rfc/1981/rfc1981_2.html#translation
node - a device that implements IPv6. router - a node that forwards IPv6 packets not explicitly addressed to itself. host - any node that is not a router. upper layer - a protocol layer immediately above IPv6. Examples are transport protocols such as TCP and UDP, control protocols such as ICMP, routing protocols such as OSPF, and internet or lower-layer protocols being "tunneled" over (i.e., encapsulated in) IPv6 such as IPX, AppleTalk, or IPv6 itself. link - a communication facility or medium over which nodes can communicate at the link layer, i.e., the layer immediately below IPv6. Examples are Ethernets (simple or bridged); PPP links; X.25, Frame Relay, or ATM networks; and internet (or higher) layer "tunnels", such as tunnels over IPv4 or IPv6 itself. interface - a node's attachment to a link. address - an IPv6-layer identifier for an interface or a set of interfaces. packet - an IPv6 header plus payload. link MTU - the maximum transmission unit, i.e., maximum packet size in octets, that can be conveyed in one piece over a link. path - the set of links traversed by a packet between a source node and a destination node path MTU - the minimum link MTU of all the links in a path between a source node and a destination node. PMTU - path MTU Path MTU Discovery - process by which a node learns the PMTU of a path flow - a sequence of packets sent from a particular source to a particular (unicast or multicast) destination for which the source desires special handling by the intervening routers. flow id - a combination of a source address and a non-zero flow label.
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