ZyXEL Communications ZyWALL 110 Handbook page 59

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The GRE tunnel runs between the IPsec public interface on the Branch unit and
the HQ 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.
CONFIGURATION > Network > Interface > Tunnel > Add
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