Draytek Vigor2830 Series - Appendix I: VLAN Applications on Vigor Router; Port-based VLAN Configuration; Tag-based VLAN Configuration

Vigor2830 Series User’s Guide
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And
6. Upon completing the above configuration, you have specified the outgoing IP address(es)
for some specific computers.
7. Now, you bind some specific computers to some WAN IP alias for outgoing traffic.