[ns] Out of memory error

[J S]

Hello-

I have a simulation set up in which I am using ping, packmime and
pareto(udp) traffcs among 150 odd nodes. Now when I tried to run my
simulation for longer time  (24 hours), the process was killed and the
kernel reported out of memory. The ns process could only last for 3 hours of
simulation time.
Does any one know how do I fix this problem?

I reviewed the page
http://isi.edu/nsnam/ns/ns-largesim.html
 It suggest that I should remove all packet headers and add specific
headers, but since I have 3 different types of  packets (ping-ICMP,
packmime-tcp and pareto-UDP), how do I implement this?
Is there any way I can check for memory leak?

Thanks
JS