Option
-I <address>
You are using at least SAProuter version 37. The section Installing SAProuter describes where you can find the latest SAProuter.
If a computer has several network interfaces, you can use this option to determine which interface is used to establish external connections. For example, this can be useful for firewalls between two networks. In this way you can specify that the connection is established in one specific network only.

The specified address must be a local interface.
