Hello!

> The server socket sockopt are all default, except for the 
> TCP_WINDOW_CLAMP which is set to 1400 (application specific).

It is definitely not all. If you do not fiddle with SO_RCVBUF also,
you will always have receiver advertising window of 1400.


11:15:00.922119 IP 10.10.10.3.1150 > 10.10.10.2.3200: S 
2246605788:2246605788(0) win 6144 <mss 1460,nop,wscale 0,nop,nop,timestamp 
3248699 0>
11:15:00.922791 IP 10.10.10.2.3200 > 10.10.10.3.1150: S 
3863556410:3863556410(0) ack 2246605789 win 1400 <mss 1460,nop,nop,timestamp 
268188460 3248699,nop,wscale 0>
11:15:00.923118 IP 10.10.10.3.1150 > 10.10.10.2.3200: . ack 1 win 6144 
<nop,nop,timestamp 3248699 268188460>
11:15:00.923486 IP 10.10.10.3.1150 > 10.10.10.2.3200: P 1:7(6) ack 1 win 6144 
<nop,nop,timestamp 3248699 268188460>
11:15:00.924143 IP 10.10.10.2.3200 > 10.10.10.3.1150: . ack 7 win 1394 
<nop,nop,timestamp 268188460 3248699>

cannot happen. SO_RCVBUF is not default.

Alexey
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