ZyXEL Communications VPN Series Handbook page 189

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In the WatchGuard VPN > Branch Office VPN > Gateway > General Settings
create a Site-to-site VPN Gateway Name and set a secure Pre-Shared Key.
VPN > Branch Office VPN > Gateway > General Settings > Credential Method
To add a Gateway Endpoint, click Add.
VPN > Branch Office VPN > Gateway > General Settings > Gateway Endpoints
The new Gateway Endpoint dialog box appears. Configure your Local Gateway
identity as WatchGuard's External IP Address (in the example, 172.100.30.63) and
Remote Gateway identity as your ZyWALL/USG's WAN IP Address (in the example,
172.101.30.73). Click OK.
VPN > Branch Office VPN > Gateway > General Settings > Gateway Endpoints
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