2.2.2.1 Mapped Address
This section follows the product behavior as described in product behavior note <8>.
The Mapped Address attribute is specified in [IETFDRAFT-STUN-02] section 10.2.1. This attribute is used to identify the public transport address allocated by the TURN server on behalf of the protocol client.
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Attribute Length |
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Family |
Port |
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IP Address |
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Attribute Type (2 bytes): The TURN attributes are specified in [IETFDRAFT-STUN-02] section 10.2 and [IETFDRAFT-TURN-08] section 9.2. Set to "0x0001".
Attribute Length (2 bytes): Set to "0x0008" (8) for an IPv4 address or "0x0014" (20) for an IPv6 address.
Reserved (1 byte): The first 8 bits are used for alignment purposes and are ignored.
Family (1 byte): The address family of the Address. It MUST have the value "0x01" for an IPv4 address or "0x02" for an IPv6 address.
Port (2 bytes): A network byte ordered representation of the mapped port.
IP Address (4 or 16 bytes): The IPv4 or IPv6 mapped address.
If the address is IPv4 (Family is set to "0x01") this is the network byte ordered 32-bit (4 byte) IPv4 address.
If the address is IPv6 (Family is set to "0x02") this is the network byte ordered 128-bit (16 byte) IPv6 address.