Set RTT for TCP

[statty01]

I am configuring TCP flows (long lived) using the OPNET simulator. I would like to apply a RTT of 40msecs to the FTP/TCP flows. Given the following parameters in OPNET, does someone now how I can strive to achieve/apply a RTT of 40msec?(The RTT gain, Max RTO etc are default values and may be changed).

Sender maximum segment size (SMSS) 1,460 bytes
Slow start initial count 2 SMSS
Receiver’s advertised window 65,535 bytes
Timer granularity 0.5 s
Persist time-out 1.0 s
Maximum ACK delay 0.0 s
Maximum ACK segment 1
Duplicate ACK threshold 3
Retransmission threshold 6
Initial RTO 3.0 s
Minimum RTO 1.0 s
Maximum RTO 64. 0 s
RTT gain 0.125
RTT deviation coefficient 4
Deviation gain 0.25

 

[burtsbees]

Is this for XDSL?

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!

 

[statty01]

Yes it is

 

[burtsbees]

Sender maximum segment size (SMSS) 1,460 bytes

For DSL, this value MUST be 1452, not the regular 1460 for ethernet (1500 MTU). This may improve round trip time.

/

tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!