Github user uce commented on the pull request:
https://github.com/apache/flink/pull/1781#issuecomment-195009701
Looks good, the man page actually says:
```
-p source_port
Specifies the source port nc should use, subject to privilege
restrictions and availability.
It is an error to use this option in conjunction with the -l option.
```
I wrote that doc, but now I'm wondering how I came to use the `-p` option.
I think we can just go with `-l`.
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