Innanzitutto grazie per la risposta questi sono i miei parametri:

TCP options string = 020405b40103030301010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 513920
RWIN Scaling (RFC1323) = 3 bits (scale factor of 6)
Unscaled Receive Window = 64240

RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your RcvWindow limits you to: 20556.8 kbps (2569.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8222.72 kbps (1027.84 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 53 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

PING:

Microsoft Windows XP [Versione 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\>ping maya.ngi.it

Esecuzione di Ping maya.ngi.it [194.185.88.3] con 32 byte di dati:

Risposta da 194.185.88.3: byte=32 durata=59ms TTL=51
Risposta da 194.185.88.3: byte=32 durata=58ms TTL=51
Risposta da 194.185.88.3: byte=32 durata=58ms TTL=51
Risposta da 194.185.88.3: byte=32 durata=58ms TTL=51

Statistiche Ping per 194.185.88.3:
Pacchetti: Trasmessi = 4, Ricevuti = 4, Persi = 0 (0% persi),
Tempo approssimativo percorsi andata/ritorno in millisecondi:
Minimo = 58ms, Massimo = 59ms, Medio = 58ms



ROUTER:
Mode: G.DMT
Type: Interleave
Line Coding: Trellis Off
Status: No Defect

Total ES: 0
Total SES: 0
Total UAS: 10

Downstream Upstream
SNR Margin (dB): 29.6 31.0
Attenuation (dB): 8.0 9.5
Output Power (dBm): 11.6 19.6
Attainable Rate (Kbps): 12064 1160
Rate (Kbps): 4832 320
K (number of bytes in DMT frame): 152 11
R (number of check bytes in RS code word): 12 16
S (RS code word size in DMT frame): 1 16
D (interleaver depth): 64 4

Super Frames: 83923 83921
Super Frame Errors: 0 0
RS Words: 5706779 356664
RS Correctable Errors: 0 0
RS Uncorrectable Errors: 0 N/A
HEC Errors: 0 0
OCD Errors: 0 0
LCD Errors: 0 0
ES Errors 0 0


Cmq non mi fido dei test è vero, però cmq uploado molto lentamente... su supereva arrivo al max a 12 KBps mentre prima viaggiavo a banda piena....