Problem with -w option for TCP window size

[Dan S <dan_ns2 --at-- yahoo.com>]

Hi all,

I have problems with -w option to set TCP window size. Everytime I specify the TCP window size by using -w option, iperf never allows me to get the specific window size as I have specified. For example, when I use iperf -c "host name" -w 7k, it shows TCP window size: 14 KByte (WARNING: requested 7.00 KByte). Which one is the allowed TCP window size? From the throughput result, I think that iperf set the window size to 14 KByte according to this example.

Another question is about the maximum TCP window size that iperf allows us to set. I am wondering what is the maximum size it allows. As far as I know, the maximum allowable TCP window size in which we can set is 64 Kbytes according to 16 bit window size allowable in TCP header. If the window size can be set to any value larger than this in iperf, please let me know how it works and how it can be possible.

 

Thank you very much for all responses.

 

Regards,

Dan  

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