+* ``--tx-ip=SRC,DST``
+
+ Set the source and destination IP address used when doing transmit only test.
+ The defaults address values are source 192.18.0.1 and
+ destination 192.18.0.2. These are special purpose addresses
+ reserved for benchmarking (RFC 2544).
+
+* ``--tx-udp=SRC[,DST]``
+
+ Set the source and destination UDP port number for transmit test only test.
+ The default port is the port 9 which is defined for the discard protocol
+ (RFC 863).
+