[ns] Question about addr_ in Agent!

[K Sun <ksun@essex.ac.uk>]

Hello,
     I have a question about "addr_" in Agent!
I am trying to develop a new agent that is of course a child class of 
Agent. In my code, I would like to use "addr_". However, to my 
surprise, in my TCL file, the addr_ is always 1024. Definitely, it is 
not right. At the same time, in my C++ code, it is always 0.
I do not know why. 
      I have tried to trace in the TCL instproc "attach" in 
ns-node.tcl. Even after the command 
"$agent set addr_ [expr (($port & $mask) << $shift) | ( ~($mask << 
$shift) & $nodeaddr)]"

The addr_ is still 1024, nodeaddr is 1024.
Only address_ of Node looks right.
   However, I traced another type of successful agent. It looks have 
the same situation above.

     In addition, I find, in my tcl file, I try to test the proc
"Node instproc getid".
I just "set n0 [ new Node]" 
then try "set node_id [ $n0 getid ]".
But it does not work and report some error information.

I really do not know what is the reason for the above problems. Is 
there any suggestion for me?

Anyway, thanks in advance!

By the way, my ns is "ns-allinone-2.1b5".

Sun Kai