ok mi hanno cambiato la portante

DSL Status Connected
DSL Speed 320 Kbps Upstream,
1504 Kbps Downstream

come devo settare i valori in drtcp???

codice:
TCP options string = 020405500103030001010402 
MTU = 1400 
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. 
MSS = 1360
MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.
 
Default Receive Window (RWIN) = 65535 
RWIN Scaling (RFC1323) = 0 bits 
Unscaled Receive Window = 65535 

Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS: 
522240 (MSS x 48 * scale factor of 8)
261120 (MSS x 48 * scale factor of 4)
130560 (MSS x 48 * scale factor of 2)
 65280 (MSS x 48)  
bandwidth * delay product (Note this is not a speed test):

Your RcvWindow limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms 
MTU Discovery (RFC1191) = ON 
Time to live left = 54 hops

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