Lots of changes and bug fixes since last packaged version,
see installed $PREFIX/share/doc/html/ns/CHANGES.html.
Provided in PR pkg/22633 by Min Sik Kim <minskim at bawi dot org>.
Minor tuning by myself.
Based on package submitted by Jan Schaumann <jschauma@cs.stevens-tech.edu>
in PR pkg/16301.
NS is a discrete event simulator targeted at networking research.
Ns provides substantial support for simulation of TCP, routing, and multicast
protocols.