ZyXEL Communications ZyWALL 110 Handbook page 654

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In the Internet Access page, you can configure Internet connections from two
Internet service providers (ISPs). Connect your ISP devices to your ZyWALL/USG
WAN port, select I have two ISPs if you want to configure two Internet connections
or leave it cleared to configure just one.
Choose the Encapsulation option to be the PPTP, leave Zone as default setting
Internet connection belongs to the WAN zone. Leave the IP Address Assignment
section to be the Auto and click Next.
Installation Setup Wizard > Welcome > Internet Access
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