Sam Rafter writes ---
If the crossover interface doesn't have a route to the WINS server (which seems rather likely), add the -wins option to your ifconfig line, and it will stop trying to register that interface with WINS. More detail is available in the SAG, conveniently located on line at now.netapp.com
Thank you. I had never noticed the -wins option to ifconfig before. (I had never needed it before)
Problem solved.