ErrorModel

[Nitin H Vaidya <vaidya@cs.tamu.edu>]

Hello:

I am using the ErrorModel to insert errors on a link.
There seems to be some problem with the initialization
of errPkt_ variable.
Although ns-default.tcl does include the initialization

     ErrorModel set errPkt_ 0

the value seems to be inadvertently overwritten by another
number once in a while.

Two unintended effects of this are that

(a) adding a comment to ns-default.tcl changes behavior - without
    the comment, no errors are introduced; with the comments,
    errors are correctly introduced.

(b) same tcl script produces different results on two machines.
    No errors introduced on one machine, while errors correctly
    introduced on another one.

Seems like a memory management problem.
I can fix this by adding

     ErrorModel set errPkt_ 0

to my tcl script. However, I do not like this fix too much.
How do I know what other initializations are getting messed up?

Any suggestions would be appreciated.

- nitin