[ns] how to add some logic to the UDP flow sending

[Tatiana Polishchuk]

Hi,

I need to add some logic to the source of UDP flow. For each packet I need
to make a decision whether to send it to one path or another.
Could anybody point me to an appropriate example or give an I idea where in
the TCL script should I add this code (which code, again?)

Please, give me an idea how to start...
Thanks in advance,