twping: Add zero-addresses option to twping manpage
@@ -100,6 +100,16 @@ SO_BINDTODEVICE.
Unspecified (sockets not bound to a particular interface).
.RE
.TP
+\fB\-Z\fR
+.br
+Do not specify sender and receiver IP addresses for tests packets when
+creating a TWAMP session. This allows the UDP test packets to pass through
+some types of NAT. This option is not available for OWAMP.
+.RS
+.IP Default:
+Unspecified (addresses for test packets are defined by the client).
+.RE
+.TP
\fB\-u\fR \fIusername\fR
.br
Specify the username that identifies the shared secret (pass-phrase)
