rfc2637.txt
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Framing Capabilities A set of bits indicating the type of framing that the sender of this message can provide. The currently defined bit settings are: 1 - Asynchronous Framing supported 2 - Synchronous Framing supported Bearer Capabilities A set of bits indicating the bearer capabilities that the sender of this message can provide. The currently defined bit settings are: 1 - Analog access supported 2 - Digital access supported Maximum Channels The total number of individual PPP sessions this PAC can support. In Start-Control- Connection-Requests issued by the PNS, this value SHOULD be set to 0. It MUST be ignored by the PAC. Firmware Revision This field contains the firmware revision number of the issuing PAC, when issued by the PAC, or the version of the PNS PPTP driver if issued by the PNS. Host Name A 64 octet field containing the DNS name of the issuing PAC or PNS. If less than 64 octets in length, the remainder of this field SHOULD be filled with octets of value 0. Vendor Name A 64 octet field containing a vendor specific string describing the type of PAC being used, or the type of PNS software being used if this request is issued by the PNS. If less than 64 octets in length, the remainder of this field SHOULD be filled with octets of value 0.2.2. Start-Control-Connection-Reply The Start-Control-Connection-Reply is a PPTP control message sent in reply to a received Start-Control-Connection-Request message. This message contains a result code indicating the result of the control connection establishment attempt.Hamzeh, et al. Informational [Page 12] RFC 2637 Point-to-Point Tunneling Protocol (PPTP) July 1999 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | PPTP Message Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Magic Cookie | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Control Message Type | Reserved0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Protocol Version | Result Code | Error Code | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Framing Capability | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Bearer Capability | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Maximum Channels | Firmware Revision | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + Host Name (64 octets) + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + Vendor String (64 octets) + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Length Total length in octets of this PPTP message, including the entire PPTP header. PPTP Message Type 1 for Control Message. Magic Cookie 0x1A2B3C4D. Control Message Type 2 for Start-Control-Connection-Reply. Reserved0 This field MUST be 0. Protocol Version The version of the PPTP protocol that the sender wishes to use. Result Code Indicates the result of the command channel establishment attempt. Current valid Result Code values are: 1 - Successful channel establishment 2 - General error -- Error Code indicates the problemHamzeh, et al. Informational [Page 13] RFC 2637 Point-to-Point Tunneling Protocol (PPTP) July 1999 3 - Command channel already exists; 4 - Requester is not authorized to establish a command channel 5 - The protocol version of the requester is not supported Error Code This field is set to 0 unless a "General Error" exists, in which case Result Code is set to 2 and this field is set to the value corresponding to the general error condition as specified in section 2.2. Framing Capabilities A set of bits indicating the type of framing that the sender of this message can provide. The currently defined bit settings are: 1 - Asynchronous Framing supported 2 - Synchronous Framing supported. Bearer Capabilities A set of bits indicating the bearer capabilities that the sender of this message can provide. The currently defined bit settings are: 1 - Analog access supported 2 - Digital access supported Maximum Channels The total number of individual PPP sessions this PAC can support. In a Start-Control- Connection-Reply issued by the PNS, this value SHOULD be set to 0 and it must be ignored by the PAC. The PNS MUST NOT use this value to try to track the remaining number of PPP sessions that the PAC will allow. Firmware Revision This field contains the firmware revision number of the issuing PAC, or the version of the PNS PPTP driver if issued by the PNS.Hamzeh, et al. Informational [Page 14] RFC 2637 Point-to-Point Tunneling Protocol (PPTP) July 1999 Host Name A 64 octet field containing the DNS name of the issuing PAC or PNS. If less than 64 octets in length, the remainder of this field SHOULD be filled with octets of value 0. Vendor Name A 64 octet field containing a vendor specific string describing the type of PAC being used, or the type of PNS software being used if this request is issued by the PNS. If less than 64 octets in length, the remainder of this field SHOULD be filled with octets of value 0.2.3. Stop-Control-Connection-Request The Stop-Control-Connection-Request is a PPTP control message sent by one peer of a PAC-PNS control connection to inform the other peer that the control connection should be closed. In addition to closing the control connection, all active user calls are implicitly cleared. The reason for issuing this request is indicated in the Reason field. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | PPTP Message Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Magic Cookie | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Control Message Type | Reserved0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reason | Reserved1 | Reserved2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Length Total length in octets of this PPTP message, including the entire PPTP header. PPTP Message Type 1 for Control Message. Magic Cookie 0x1A2B3C4D. Control Message Type 3 for Stop-Control-Connection-Request. Reserved0 This field MUST be 0. Reason Indicates the reason for the control connection being closed. Current valid Reason values are:Hamzeh, et al. Informational [Page 15] RFC 2637 Point-to-Point Tunneling Protocol (PPTP) July 1999 1 (None) - General request to clear control connection 2 (Stop-Protocol) - Can't support peer's version of the protocol 3 (Stop-Local-Shutdown) - Requester is being shut down Reserved1, Reserved2 These fields MUST be 0.2.4. Stop-Control-Connection-Reply The Stop-Control-Connection-Reply is a PPTP control message sent by one peer of a PAC-PNS control connection upon receipt of a Stop- Control-Connection-Request from the other peer. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | PPTP Message Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Magic Cookie | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Control Message Type | Reserved0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Result Code | Error Code | Reserved1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Length Total length in octets of this PPTP message, including the entire PPTP header. PPTP Message Type 1 for Control Message. Magic Cookie 0x1A2B3C4D. Control Message Type 4 for Stop-Control-Connection-Reply. Reserved0 This field MUST be 0. Result Code Indicates the result of the attempt to close the control connection. Current valid Result Code values are:Hamzeh, et al. Informational [Page 16] RFC 2637 Point-to-Point Tunneling Protocol (PPTP) July 1999 1 (OK) - Control connection closed 2 (General Error) - Control connection not closed for reason indicated in Error Code Error Code This field is set to 0 unless a "General Error" exists, in which case Result Code is set to 2 and this field is set to the value corresponding to the general error condition as specified in section 2.2. Reserved1 This field MUST be 0.2.5. Echo-Request The Echo-Request is a PPTP control message sent by either peer of a PAC-PNS control connection. This control message is used as a "keep- alive" for the control connection. The receiving peer issues an Echo-Reply to each Echo-Request received. As specified in section 3.1.4, if the sender does not receive an Echo-Reply in response to an Echo-Request, it will eventually clear the control connection. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | PPTP Message Type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+⌨️ 快捷键说明
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