Draytek Vigor3900 User Manual page 169

7. In the following page, check the box of Enable. Choose Object as the Source Type
and choose IP range object profile from the drop down list of IP Object. Click Apply to
save the settings.
And,
8. Upon completing the above configuration, you have specified the outgoing IP
address(es) for some specific computers.
Now, you bind some specific computers to some WAN IP alias for outgoing traffic.
Vigor3900 Series User's Guide
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