ZyXEL Communications VPN Series Handbook page 663

How to Configure Two Different WAN Interfaces with
Different IP Addresses in the Same VLAN
This is an example of using ZyWALL/USG to configure two different WAN
interfaces with different IP addresses in the same VLAN. After configuration, you
can have the same VLAN ID for two different WAN interfaces.
ZyWALL/USG with Two Different WAN Interfaces with Different IP Addresses in the
Same VLAN Example
Note: This example requires the ZyWALL/USG models which can apply port grouping.
All network IP addresses and subnet masks are used as examples in this article. Please
replace them with your actual network IP addresses and subnet masks. This example was
tested using ZyWALL USG300 (Firmware Version: ZLD 4.25).
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