occur if a normal duplex link was created first. The reason is coz the
creation of an rlink would also internally create an IPTap agent and when
this agent was being attached to the node, classifier entries were being
added to the port demultiplexer for all the IP addresses of the simnode.
Unfortunately, if an rlink was created first before anything else, the
IP address would be set only in the next Tcl statement causing nse to
exit prematurely.