nc port scan, aka udp noise maker.

[Brynet]

I think this was a feature, right? :-)

Index: netcat.c
===================================================================
RCS file: /cvs/src/usr.bin/nc/netcat.c,v
retrieving revision 1.101
diff -u -p -u -r1.101 netcat.c
--- netcat.c    21 Jun 2011 17:31:07 -0000      1.101
+++ netcat.c    9 Sep 2011 07:01:05 -0000
@@ -264,6 +264,8 @@ main(int argc, char *argv[])
                errx(1, "cannot use -p and -l");
        if (lflag && zflag)
                errx(1, "cannot use -z and -l");
+       if (uflag && zflag)
+               errx(1, "cannot use -u and -z");
        if (!lflag && kflag)
                errx(1, "must use -l with -k");