Problem with Changing Pipe and Queue Configurations repeatedly

[Koroush Saraf]

Hi All,

I would like to change the weight of queues without loosing data that might
already be queued.

So I initially create a queue by typing
ipfw queue 103 config weight 10 queue 4000KBytes pipe 100
and data flows through the associate queue and pipe just fine.

I again type the command
ipfw queue 103 config weight 20 queue 4000KBytes pipe 100
to change the weight to 20 but nothing happens.  the weight remains as the
original value of 10.

I thought I had already tested this before and saw it working.  Can someone
tell me why I might be having this problem now and if its fixable?  I'm
using FreeBSD4.6.

thanks,
~koroush