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FTP server sending lower sized segments randomly

FTP server sending lower sized segments randomly

FTP server sending lower sized segments randomly

I am troubleshooting a wireshark log and have stumbled upon this FTP behavior, FTP server sends a single lower segment after multiple MSS sized segments.

I dont know why this is happening. This is consistent once it starts like 11*MSS sized segments followed by 1 small segment.

Receiver window is almost empty (64k) and acks all the transmissions.

Any clues?

RE: FTP server sending lower sized segments randomly

I apologize for the lack of real details, but I recall reading something about this subject recently, but I am having trouble recalling the specifics.  From what I remember, there are multiple (two?) buffers and counters associated with determining how big of a packet will be sent.  The purpose was to avoid network congestion and there are a couple of different "named" algorithms that govern the packet size behavior to this effect.  The net result is that even if the receiver can accept a larger packet, there are several conditions under which smaller ones will be transmitted.  You may want to try searching for TCP/IP congestion prevention or a similar set of keywords for more information.

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