"Sampsa" == Sampsa Laine <sampsa at mac.com> writes: Sampsa> The main disadvantage I can see is that SSH runs over TCP so Sampsa> any dropped packets might cause more delays than using Sampsa> straight UDP. That isn't actually a disadvantage when you travel all the way to the top of the stack. Yes, the DECnet network layer (just like IP) uses, and provides, a datagram service. But it also uses retransmit internally for stuff that has to get through, and of course the transport layer (NSP) makes a reliable service through timeout and retry. So a tunnel over TCP is just fine. It means you have a lossless network (ignoring congestion in the DECnet nodes). So instead of having delays due to timeout and retransmit in NSP, you have the same delay (or, quite possibly, a shorter delay) due to timeout and retransmit in TCP. The overall application performance should come out essentially the same. paul