segmentation fault using ns2b2

[Ng Kwang Loong Stanley <stanleyng@cheerful.com>]

Hi to all,

I would like to know if there is any considerations concerning the allocation of
memory when using ns ?

The problems I encountered are: 1st run of say foo.tcl was successful.
  but when i changed  the time when the agent join the multicast group the 2nd run
becomes unsuccessful.

thanks in advance