Finalmente tele2 si è degnata di darmi i codici e ora ho l'adsl
X ora va abbastanza bene ( :sgrat: )
Ho cliccato sul link di speedguide e mi da questi valori:
TCP options string = 0204058c01010402
MTU = 1460
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
MSS = 1420
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

Default Receive Window (RWIN) = 18000
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 18000

For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
522560 (MSS x 46 * scale factor of 8)
261280 (MSS x 46 * scale factor of 4)
130640 (MSS x 46 * scale factor of 2)
65320 (MSS x 46)
bandwidth * delay product:

Your RcvWindow limits you to: 720 kbps (90 KBytes/s) @ 200ms
Your RcvWindow limits you to: 288 kbps (36 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.
MTU Discovery (RFC1191) = ON
Time to live left = 57 hops

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

Come è possibile che il mtu è a 1460 quando da dr.TCP l'ho settato a 1500?
Io uso XP e ho letto nel thread potrebbe limitare il mtu a 1492, ma io ho 1460 e mi sembra un po pochino