ZyXEL Communications ZYWALL USG 20W - Page 11

ZyXEL – ZyWALL USG Support Notes
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Step 13. Configure the trunk name and add the two interfaces: PPPoE for
Active and 3G for Passive mode.
Step 14. Select the User Configured Trunk rule as the default WAN trunk.
Then it will work using PPPoE as primary and 3G as a backup connection.