2.2.1.1.3 Characteristics
The Characteristics attribute identifies various characteristics of the responder host and network interface. This attribute is mandatory. All responders MUST include this attribute in all Hello frames.
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Type |
Length |
P |
X |
F |
M |
L |
Reserved |
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Type (1 byte): This field MUST be set to 0x02.
Length (1 byte): This field MUST be set to 0x02.
P (1 bit): Network interface is the public side of a network address translation (NAT), as specified in [RFC3022].
X (1 bit): Network interface is the private side of a NAT.
F (1 bit): Network interface is in full duplex mode.
M (1 bit): Responder MUST set this field if it has a management web page accessible via the HTTP protocol. A management web page is optional. A responder MAY support it. The mapper SHOULD construct a URL from the reported IPv6 address. If one is not available, the IPv4 address MUST be used instead. The URL MUST be of the form: "http://<ip-address>/", where "<ip-address>" is either an IPv6 address in IPv6 literal notation (as specified in [RFC3513] section 2.2) or an IPv4 address in four-part dotted decimal notation (as specified in [RFC1123] section 2.1).
L (1 bit): Network interface is looping back outbound packets; the outbound packet is sent over the network interface and also looped back to the interface sending the packet (allowing other protocols bound to the interface to receive the packet).
Reserved (11 bits): MUST be set to zero when sent and ignored on receipt.