In article <(E-Mail Removed)>, notgiven wrote:
>A mainframe host is sending from a specific port to a PC (an IP
>address / port) using "Raw" TCP/IP. At the end of the first page they
>change from the original sending port to a different port, still
>sending to the same IP address and destination port. The job fails,
>only the first page printing.
Without further information, one would have to say this is wrong, citing
RFC0793 section 1.5 - one paragraph of which reads
When two processes wish to communicate, their TCP's must first
establish a connection (initialize the status information on each
side). When their communication is complete, the connection is
terminated or closed to free the resources for other uses.
>I think it its correct behavior on the part of the receiving system to
>end the TCP stream when transmission ceases from the original port,
>and assume that the transmission from the new port (same IP address)
>is a new transmission.
From a simplistic translation, see also section 3.5, which begins
3.5. Closing a Connection
CLOSE is an operation meaning "I have no more data to send."
>Any ideas or suggestions?
Not really enough information. Perhaps reading RFC0793 might give further
ideas.
0793 Transmission Control Protocol. J. Postel. Sep-01-1981. (Format:
TXT=172710 bytes) (Updated by RFC3168) (Also STD0007) (Status:
STANDARD)
RFC1180 may also be of interest.
1180 TCP/IP tutorial. T.J. Socolofsky, C.J. Kale. Jan-01-1991.
(Format: TXT=65494 bytes) (Status: INFORMATIONAL)
Both documents are on-line at many websites such as
http://www.ietf.org/rfc/rfc0793.txt (and rfc1180.txt)
Old guy
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