ZyXEL Communications ZyWALL 110 Handbook page 58

Quick Setup > VPN Setup Wizard > Welcome > Wizard Type > VPN Settings >
Wizard Completed
Go to CONFIGURATION > VPN > IPSec VPN > VPN Gateway > Show Advanced
Settings. Configure Authentication > Peer ID Type as Any to let the ZyWALL/USG
does not require to check the identity content of the remote IPSec router.
CONFIGURATION > VPN > IPSec VPN > VPN Gateway > Show Advanced Settings
> Authentication > Peer ID Type
Go to CONFIGURATION > VPN > IPSec VPN > VPN Connection > Show Advanced
Settings > Policy. Select Enable GRE over IPSec.
CONFIGURATION > VPN > IPSec VPN > VPN Connection > Show Advanced
Settings > Policy
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