Recent simh versions no longer need any external program to work with tap devices. Mark - I was just looking at this. Looks like in simh you now say attach xq tap:tap0 What does that do that attach xq tap0 does not? Does the first one make simh create the tap device? That doesn't really help in this case - the problem is that I need to run Johnny's bridge on tap0 too, so it needs to already exist before I start simh. tunctl is still the only answer. Thanks, Bob