fragmentation of a datagram

[Peter Crawford <creature.58@hotmail.com>]

I have a Debian router where MTU = 576 to the ISP and MTU = 1500 
to a non-Linux client.  The client receives data but is unable 
to send out anything but small messages and files.  A Linux client 
and the router itself have no problem sending anything. 
http://carnot.yi.org/Network.jpg
 
Is there a kernel configuration which would prevent the router 
from fragmenting outgoing datagrams from the client larger than 
576 bytes?
 
Thanks,             ... p. crawford
 
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