HP VPN Firewall Appliances VPN Configuration Guide

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Figure 9 Adding a GRE over IPv4 tunnel interface
3. Configure the GRE over IPv4 tunnel interface as described in Table 1.
4. Click Apply.
Table 1 Configuration items
Item Descri
p
tion
Tunnel Interface Specify the number of the tunnel interface.
IP/Mask
Specify the IP address and subnet mask of the tunnel interface.
IMPORTANT:
When configuring a static route on the tunnel interface, make sure the destination IP
address of the static route is not in the subnet of the tunnel interface.
Zone Specify the security zone to which the tunnel interface belongs.
Tunnel Source
IP/Interface
Specify the source IP address and destination IP address for the tunnel interface.
For the tunnel source address, you can input an IP address or select an interface. In
the latter case, the primary IP address of the interface will be used as the tunnel
source address.
The source address and destination address of a tunnel uniquely identify a path.
They must be configured at both ends of the tunnel and the source address at one
end must be the destination address at the other end and vice versa.
Tunnel Destination IP
GRE Key
Specify the key for the GRE tunnel interface. This configuration is to prevent the
tunnel ends from servicing or receiving packets from other places.
The two ends of a tunnel must have the same key or have no key at the same time.
GRE Packet Checksum Enable or disable the GRE packet checksum function.