[ns] wireless (ping) invalid packet type error!

[justin lipman <justin@snrc.uow.edu.au>]

Hi,

I have been attempting to use the ping agent as well as my own modified
ping agent with a set of wireless nodes. (All works well with a set of
wired nodes.)

When I run the simulation. I get the following errror:

num_nodes is set 20
Loading scenario file...
Load complete...
Starting Simulation...
(null) - invalid packet type (ping).

I noticed in the archives someone else had the same problem in 1999, but
no solution that I could see.
I am using ns-allinone-2.1b7.

Thanks in advance,
Justin