When CDRouter starts, each new IP protocol stack will select an initial port number that will be used for the initial source port. From that point on, port numbers are assigned sequentially. The initial port is selected randomly between the range of 10,000 to 15,000.
In some testing situations, it may be desirable to have CDRouter start with the same source port each time. This can be done by configuring the testvar tcpUdpPortStart with the initial starting port.
Example using port as 8000 as the initial source port:
testvar tcpUdpPortStart 8000
The actual port used in the first test will not be the defined port since other ports may be used during the startup phase, but it should be deterministic.