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The Callback configuration option used in the LCP is specified in [RFC1570] section 2.3. The operation field 0x06 is defined for negotiating this protocol. The following is the format of the option.
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1 |
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2 |
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3 |
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Type |
Length |
Operation |
Message (variable) |
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... |
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Type (1 byte): This MUST be 0x0D.
Length (1 byte): This MUST specify the length of the option, including the Type, Length, Operation, and Message fields. Hence this MUST be at least 0x03 bytes.
Operation (1 byte): This MUST be 0x06.
Message (variable): This field SHOULD NOT be present. If present, the contents of this field MUST be ignored.