Ragazzi io ho linux(slackware 10.1) come posso settare l'RWIN?
Se faccio il test mi dà : (credo cmq che l'rwin sia una valore sballato...dagli speed test rilevo un download di 150-155 Kb/sec e un upload di 32/33 Kb/sec)
codice:
TCP options string = 020405840402080a00034b310000000001030300
MTU = 1452
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1412
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.
Default Receive Window (RWIN) = 5808
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 5808
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
519616 (MSS x 46 * scale factor of 8)
259808 (MSS x 46 * scale factor of 4)
129904 (MSS x 46 * scale factor of 2)
64952 (MSS x 46)
bandwidth * delay product (Note this is not a speed test):
Your RcvWindow limits you to: 232.32 kbps (29.04 KBytes/s) @ 200ms
Your RcvWindow limits you to: 92.928 kbps (11.616 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
MTU Discovery (RFC1191) = ON
Time to live left = 56 hops
TTL value is ok.
Timestamps (RFC1323) =
Timestamps (RFC1323) = ON
Note: Timestamps add 12 bytes to the TCP header of each packet, reducing the space available for useful data.
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000
Grazie mille! 
ps Come connessione ho Alice adsl flat upgradata alla mega da circa 10 giorni.