> By the way, if tcpdump does not track the window scale option, the right > edge (ack + real win) does not change between the following two ACKs. > > > 11:34:54.337167 10.2.20.246.33060 > 10.2.224.182.8700: . ack 84402527 win 15340 <nop,nop,timestamp 226080473 99717814> (DF) > (259 ACKs are omitted here) > > 11:34:54.611769 10.2.20.246.33060 > 10.2.224.182.8700: . ack 84454467 win 2355 <nop,nop,timestamp 226080721 99717841> (DF) > > The first line is the 37th ACK and the second line is the 295th ACK. > > ACK#37: ack=84402527 win=15340 right_edge=84463887 (= ack + win * 4) > ACK#295: ack=84454467 win=2355 right_edge=84463887 (= ack + win * 4) > > And all ACKs later than ACK#295 has win=2355 (2355*4=9420). > > This may be a hint. But, sorry, I do not know the internal of Linux TCP. I think there is a possibility that some middle-box does something, for example, some middle-box between the two machines does kinda traffic-shaping by tweaking the TCP window size field. Regards, Noritoshi Demizu - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
