I have had a look through this thread and must confess I'm a little confused as to why it's proving so trouble some. I'm pretty sure this is something stupid that's being missed, but...
You shouldn't need to worry about NOTRAILERS unless you are needing to route packets. I assume that your NFS node containing the ufsdump that you want to restore is on the same subnet??
Firstly, I appreciate why you are trying to connect an external HDD but do you realize just how slow it might be? If your (Sun) hardware is USB1 then it will be hopeless!! If it's USB2 it will be...