Method and apparatus for establishing protocol spoofing from a modem
US5309562A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1991 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Aug 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L67/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for establishing a spoofing service for a high-level file transfer protocol from a modem. A modem spoofing initiation protocol (MSIP) word containing modem limitations is appended to the initial negotiation frame sent by the host to the receiver. If the receiving modem detects the MSIP word at the end of the negotiation frame, it compares its own limits with the received limits, takes the lower limit as the agreement, then appends the agreement word to the frame sent to acknowledge the negotiation frame. If the sending modem detects the agreement word, both modems use the agreed limits to examine the maximum block size and window size in the negotiation frame of the high-level file transfer protocol. If the block size and window size are within the agreed values, the spoofing service begins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.