Question regarding manager and proxy defined in node.cfg

Hi,

I’ve seen documentation where node.cfg files are defined as:

[manager]
type=manager
host=127.0.0.1
interface=eth0

[proxy]

type=manager
host=127.0.0.1
interface=eth0

And I’ve also seen other documentation defined that excludes the interface:

[manager]
type=manager
host=127.0.0.1

[proxy]

type=manager
host=127.0.0.1

If I’m running Bro on a local machine, no cluster configuration, etc, what effect does defining the interface type for the proxy and manager have over not defining it at all?

Thanks!