ZyXEL Communications ZyWALL 110 Handbook & Instructions page 24

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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.
Figure 28 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.
Figure 29 CONFIGURATION > VPN > IPSec VPN > VPN Connection > Show
Advanced Settings > Policy
The GRE tunnel runs between the IPsec public interface on the HQ unit and the
Branch unit. Go to CONFIGURATION > Network > Interface > Tunnel > Add. Enter
the Interface Name (The format is tunnelx, where x is 0 - 3.). Enter the IP Address
and Subnet Mask for this interface. Specify My Address to be the interface or IP
address to use as the source address for the packets this interface tunnels to the
remote gateway. Enter Remote Gateway Address to be the IP address or
domain name of the remote gateway to this tunnel traffic.
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