Hi Cheung,
As stated in the ns-manual, page 113, "This structure
primarily defines fields used for tracing the flow of packets or
measuring other quantities..."
Have a nice day
Cheung Kin Pong wrote:
> Hi all,
>
> I am the beginner of NS-2 and have some questions on Ns:
>
> 1) what is the meaning of HDR_CMN?
> 2) what is the use of the command tcl.evalf()?
>
> thanks a lot
>
> regards,
> bond