correggo quanto affermato prima: l'upgrade è stato completato e ora viaggio a 4000 pieni.
ho fatto come suggerito da fivendra e tutto sembra funzionare perfettamente,(anzi meglio, mclink mi da 4093 contro i 4074 rilevati prima delle modifiche) ancora una cosa non capisco rwin sul pc è settato a 261120 (valore che avevo impostato prima) ma viene letto come 261340. lascio così?

SpeedGuide.net TCP/IP Analyzer

TCP properties for IP =
Browser/OS = Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8) Gecko/20051111 Firefox/1.5
Notes: Read the Analyzer FAQ if the above is not your IP address.
TCP options string = 020405b40103030201010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default Receive Window (RWIN) = 261340
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled Receive Window = 65335

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 (Note this is not a speed test):

Your RcvWindow limits you to: 10453.6 kbps (1306.7 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4181.44 kbps (522.68 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 117 hops

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




ringrazio l'ottimo fivendra per l'aiuto