R3721-F3210-F3171-HP High-End Firewalls VPN Configuration Guide-6PW101

Figure 13 Status information and statistics of interface Tunnel0

# From Device B, ping the IP address of GigabitEthernet 0/2 on Device A.

<DeviceB> ping 10.1.1.1

PING 10.1.1.1: 56 data bytes, press CTRL_C to break

Reply from 10.1.1.1: bytes=56 Sequence=1 ttl=255 time=2 ms

Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=255 time=2 ms

Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=255 time=2 ms

Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=255 time=2 ms

Reply from 10.1.1.1: bytes=56 Sequence=5 ttl=255 time=2 ms

--- 10.1.1.1 ping statistics ---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max = 1/1/2 ms

Configuring a GRE over IPv4 tunnel at the CLI

Configuration guidelines

• 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 interfaces using the same encapsulation protocol must have different source addresses and

destination addresses.

• If you configure a source interface for a tunnel interface, the tunnel interface takes the primary IP

address of the source interface as its source address.