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https://www.7key.jp/rfc/1883/rfc1883_2.html#source
https://www.7key.jp/rfc/1883/rfc1883_2.html#translation
node - a device that implements IPv6. router - a node that forwards IPv6 packets not explicitly addressed to itself. [See Note below]. host - any node that is not a router. [See Note below]. 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. neighbors - nodes attached to the same link. 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 MTU - the minimum link MTU of all the links in a path between a source node and a destination node.
Note: it is possible, though unusual, for a device with multiple interfaces to be configured to forward non-self-destined packets arriving from some set (fewer than all) of its interfaces, and to discard non-self-destined packets arriving from its other interfaces. Such a device must obey the protocol requirements for routers when receiving packets from, and interacting with neighbors over, the former (forwarding) interfaces. It must obey the protocol requirements for hosts when receiving packets from, and interacting with neighbors over, the latter (non-forwarding) interfaces.
注記:あるインターフェイスの集合(全てではない)から到着する自分宛ではないパケットを転送し、且つその他のインターフェイスから到着する自分宛ではないパケットを破棄するために配置される、複数のインターフェイスを備えた機器は珍しいものではあるが可能である。このような機器は、前者の(転送)インターフェイスからパケットを受け取り、隣接ノードと相互作用する際、ルータのプロトコル要求事項に従わなければならない。更に、後者の(非転送)インターフェイスでパケットを受け取り、隣接ノードと相互作用する際、ホストのプロトコル要求事項に従わなければならない。
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