Ho fatto un po' di test alla mia linea Tin.it 256/128.

Virgilio

Prove :10 Velocita' Media :252.88676269292014Kbit/sec
Prove :10 Velocita' Media :254.30994674005848Kbit/sec

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www.speedtest.nl

Download 31.4 KByte/sec (=251 kbps)

Upload 15.4 KByte/sec (=123 kbps)

Connection 322.0 Conn/min

Ping test Nederlan 102.0 ms

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Ping medio www.ngi.it: 57ms

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Ping medio www.dslreports.com: 152 ms

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TCP options string = 020405b401010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 17520
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 17520

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 700.8 kbps (87.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 280.32 kbps (35.04 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
MTU Discovery (RFC1191) = ON
Time to live left = 120 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000

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Che ve ne pare?