Gurus,
After much mucking through a Linux library I have found my problem
with multicast.
The address/port for this test (upnp) is 239.255.255.250:1900
If a process binds to this address for purposes of receiving messages,
then another process (or same process) on the same system builds
messages, sends them using sendto(), and they exceed ~170-220
bytes then tcpip/io-net will fail.
On the console that started io-net is a single message ‘m_copym’
and io-net/tcpip are no longer running. 10 times out of 10 I just
did this 
The size has varied and part of it may be due to how fast stuff gets
updated before it dies (I was fflush()ing).
What are the chances of getting a quick-fix since this just forced me
to stop working on UPnP code on Nto and pull out my Linux HD
so I can proceed…
Sample program attached - make sure you save anything you need
over the network before you run it
Jay
begin 666 kill-tcpip.c
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`
end