HP VPN Firewall Appliances VPN Configuration Guide

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Figure 31 Adding a GRE over IPv4 tunnel interface (Tunnel 1)
3. Create a P2MP GRE tunnel interface, with the tunnel interface number being 0:
a. Select VPN > GRE > P2MP from the navigation tree.
b. Click Add.
c. Enter 0 in the Tunnel Interface field, and enter IP address/mask 172.168.1.1/24.
d. Select Management from the Zone list. (Select a security zone according to your network
configuration.)
e. Enter 11.1.1.1 as the tunnel source address, 24 as the branch network address mask, and 10
as the tunnel entry aging time.
f. Select the box before Enable Interface Backup, and select backup interface Tunnel1.
g. Click Apply.
Figure 32 Adding a P2MP GRE tunnel interface (Tunnel0)