First, each Oracle GoldenGate manager process has to have a unique port. This port is used to communicate between the manager process and other Oracle GoldenGate processes. This is configured in the manager parameter file (mgr.prm) using the PORT parameter.
Second, for Oracle GoldenGate local processes to bind with remote communications, there is a need for a range of ports. This range can start starting at port 7840 or a customized range of up to 5000 other ports (as of GoldenGate 12.2). This is configured with the DYNAMICPORTLIST parameter. The followings are the processes needs ports allocated by DYNAMICPORTLIST:
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port 7809 DynamicPortList 7820-7830, 7833, 7835