F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices VPN Configuration Guide-6PW100

4
Figure 6 Network diagram
327BOperating with IPsec
As shown in 670HFigure 7, GRE can be encapsulated into IPsec to improve transmission security for routing
protocol packets, voice data, and video data.
Figure 7 Network diagram
For more information about IPsec, see Security Configuration Guide.
96BProtocols and standards
• RFC 1701, Generic Routing Encapsulation (GRE)
• RFC 1702, Generic Routing Encapsulation over IPv4 networks
• RFC 2784, Generic Routing Encapsulation (GRE)
15B
Configuring a GRE over IPv4 tunnel in the Web
interface
97BConfiguration prerequisites
Before you configure a GRE over IPv4 tunnel, configure an IP address for the interface (such as a VLAN
interface, an Ethernet interface, or a Loopback interface) to be used as the source interface of the tunnel
interface.