Here is a diff that improves the CAVEATS section which describes using the options -uz together.
Any objections? -lum Index: nc.1 =================================================================== RCS file: /cvs/src/usr.bin/nc/nc.1,v retrieving revision 1.59 diff -u -p -r1.59 nc.1 --- nc.1 4 Oct 2011 08:34:34 -0000 1.59 +++ nc.1 7 Feb 2012 04:29:07 -0000 @@ -449,8 +449,15 @@ Original implementation by *Hobbit* Rewritten with IPv6 support by .An Eric Jackson Aq [email protected] . .Sh CAVEATS -UDP port scans will always succeed -(i.e. report the port as open), -rendering the +UDP port scans using the .Fl uz -combination of flags relatively useless. +combination of flags will always report success irrespective of +the target machine's state. +However, +in conjunction with a traffic sniffer either on the target machine +or an intermediary device, +the +.Fl uz +combination could be useful for communications diagnostics. +Note that the amount of UDP traffic generated may be limited either +due to hardware resources and/or configuration settings.
