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The Configuration Attribute packet is specified in [RFC4306] section 3.15.1. The format is as follows.
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2 |
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3 |
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R |
Attribute Type |
Length |
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Value (variable) |
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... |
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R (1 bit): This reserved field MUST be as specified in [RFC4306] section 3.15.1.
Attribute Type (15 bits): This field MUST be as specified in [RFC4306] section 3.15.1.
Length (2 bytes): The length of the data in the Value field.
Value (variable): The internal IPv4 or IPv6 address of the server.
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Two additional Attribute Types from the private-use range are defined as follows.
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Attribute type
Length (bytes)
Value
INTERNAL_IP4_SERVER
0x5BA0
4
The internal IPv4 address of the server.
INTERNAL_IP6_SERVER
0x5BA1
16
The internal IPv6 address of the server.