ZyXEL Communications VPN Series Handbook page 619

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What Could Go Wrong?
If there is no traffic passing through either WAN1 or WAN2 interfaces, check that
the Mode of both WAN1 & WAN2 should be Active. If a trunk is in Passive mode,
the ZyWALL/USG will use this connection only when all of the connections set to
Active mode are down.
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