If those ethernet ports are part of a managed switch (looks like the 815 uses the WIC-4ESW module), then the command would be
Router(config)#monitor session 1 source interface (interface you want to monitor) both
Router(config)#monitor session 1 destination interface (port you are mirroring the data to)
If the router does not accept those commands, then you'll out of luck and need to either purchase a managed switch to attach to the 815, or use a hub on the port you want to monitor.
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