RFC 1151 (rfc1151) - Page 2 of 4
Version 2 of the Reliable Data Protocol (RDP)
Alternative Format: Original Text Document
RFC 1151 RDP - Version 2 April 1990 The 8-bit port size is probably too small to support a large range of applications. Accordingly, the port size is now 16-bits. Port numbers less than 1024 are reserved for well-defined applications. Allocable ports begin at port number 1024. Finally, because the checksum and port size have been changed, the version number has been increased to 2. 0 0 0 1 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+---+---------------+ |S|A|E|R|N| |Ver| Header | 0 |Y|C|A|S|U|0|No.| Length | |N|K|K|T|L| | | | +-+-+-+-+-+-+---+---------------+ 1 | Source Port | +---------------+---------------+ 2 | Destination Port | +---------------+---------------+ 3 | Data Length | +---------------+---------------+ 4 | | +--- Sequence Number ---+ 5 | | +---------------+---------------+ 6 | | +--- Acknowledgement Number ---+ 7 | | +---------------+---------------+ 8 | Checksum | +---------------+---------------+ 9 | Variable Header Area | . . . . | | +---------------+---------------+ RDP Header Format Figure 1 Minor Errors and Ambiguities Some ambiguities and minor errors have been found in RFC-908. They are corrected in this section. The value of the state variable, SND.UNA is treated inconsistently in the pseudo-code on pages 21-29. On page 12, SND.UNA is defined as Partridge & Hinden
