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GRE configuration examples
Configuring an IPv4 over IPv4 GRE tunnel
Network requirements
Group 1 and Group 2 are two private IPv4 networks. The two networks both use private network
addresses and belong to the same VPN. Establish a GRE tunnel between Router A and Router B to
interconnect the two private IPv4 networks Group 1 and Group 2.
Figure 137 Network diagram
Configuration procedure
Before performing the following configuration, configure an IP address for each interface, and make
sure Router A and Router B can reach each other.
1. Configure Router A:
# Create a tunnel interface Tunnel 0, and specify the tunnel mode as GRE/IPv4.
<RouterA> system-view
[RouterA] interface tunnel 0 mode gre
# Configure an IP address for the tunnel interface.
[RouterA-Tunnel0] ip address 10.1.2.1 255.255.255.0
# Configure the source address of the tunnel interface as the IP address of GigabitEthernet
2/0/2 on Router A.
[RouterA-Tunnel0] source 1.1.1.1
# Configure the destination address of the tunnel interface as the IP address of GigabitEthernet
2/0/2 on Router B.
[RouterA-Tunnel0] destination 2.2.2.2
[RouterA-Tunnel0] quit
# Configure a static route from Router A through the tunnel interface to Group 2.
[RouterA] ip route-static 10.1.3.0 255.255.255.0 tunnel 0
2. Configure Router B:
# Create tunnel interface Tunnel 0 and specify the tunnel mode as GRE/IPv4.
<RouterB> system-view
[RouterB] interface tunnel 0 mode gre
# Configure an IP address for the tunnel interface.
[RouterB-Tunnel0] ip address 10.1.2.2 255.255.255.0
# Configure the source address of the tunnel interface as the IP address of interface
GigabitEthernet 2/0/2 on Router B.
[RouterB-Tunnel0] source 2.2.2.2
# Configure the destination address of the tunnel interface as the IP address of the interface
GigabitEthernet 2/0/2 on Router A.
[RouterB-Tunnel0] destination 1.1.1.1
[RouterB-Tunnel0] quit
# Configure a static route from Router B through the tunnel interface to Group 1.
IPv4
Group 2
IPv4
Group 1
GE2/0/1
10.1.1.1/24
GE2/0/1
10.1.3.1/24
Tunnel0
10.1.2.1/24
GE2/0/2
1.1.1.1/24
GE2/0/2
2.2.2.2/24
Internet
GRE tunnel
Tunnel0
10.1.2.2/24
Router A Router B
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