Non riesco a modificare Mtu
ho provato sia Optmizer che DrTcp
rimane sempre 1470

ho un router Netgear DG834
dove ho impostato Mtu a 1492
e sono abbonato con Tiscali 6mb
consigli???
grazie in anticipo

da speedguide.net

MTU = 1470
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.
MSS = 1430
Maximum useful data in each packet = 1430, which equals MSS.

Default TCP Receive Window (RWIN) = 261688
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled TCP Receive Window = 65422

For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
503360 (MSS x 44 * scale factor of 8)
251680 (MSS x 44 * scale factor of 4)
125840 (MSS x 44 * scale factor of 2)
62920 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 10467.52 kbps (1308.44 KBytes/s) @ 200ms
Your TCP Window limits you to: 4187.008 kbps (523.376 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 56 hops

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