ZyXEL Communications ZyWall ATP series - Set up the Ipsec VPN Tunnel on the Watchguard

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your ZyWALL/USG’s WAN IP Address (in the example, 172.101.30.73). Then,
configure Authentication > Remote ID Type as IPv4 and set the Content as your
WatchGuard’s External IP Address (in the example, 172.100.30.63). Click OK.
CONFIGURATION > VPN > IPSec VPN > VPN Gateway > Show Advanced Settings >
Authentication > Peer ID Type
Set Up the IPSec VPN Tunnel on the WatchGuard
Go to Dashboard > Network Interfaces to check your External IP Address (the
Internet-facing interface) and Trusted IP Address (the Local IP address).
Dashboard > Network Interfaces