hello folks.  Under cisco IOS, there is a command you can use, when
configuring gre tunnels, for allowing the mtu size of the tunnel itself to
be 1500 bytes.  this causes encapsulated packets to be fragmented and
reassembled at each end of the tunnel, but allows brain-damaged Windows
machines to use the tunnels without user intervention.
	Can the gre(4) or ipip(4) drivers perform this 
trick and thus provide a 1500 byte mtu through the tunnel?
If so, how do I configure it?
-thanks
-Brian