Configuring an IPv6 over IPv4 Manual Tunnel
In an IPv6 over IPv4 manual tunnel, the source address and destination address are statically specified. Therefore, this tunnel is a simple P2P one.
Prerequisites
- IPv6 packet forwarding is enabled globally.
- The IPv4 address of the interface connecting to the IPv4 network is specified, the interface is Up, and the IPv4 address is routable.
Context
Application ScenarioThe IPv6 over IPv4 manual tunnel is configured between two border devices.
As shown in Figure 1, FW_A and FW_B support the dual stack, and are connected to an IPv6 network and the IPv4 network respectively. The IPv6 over IPv4 manual tunnel connects to two different IPv6 networks, enabling the PCs or devices on different IPv6 networks to communicate.
Tunnel Route
After the tunnel is established, the source and destination are routable to each other to ensure normal packet forwarding. Either static routes or dynamic routes can be configured.
To configure a static route, set the destination address to the IPv6 address of the interface on the peer IPv6 network and the outbound interface to the local tunnel interface.
To configure a dynamic route, enable dynamic routing protocols on the tunnel interface and interfaces connected to the IPv4 network and IPv6 network. The IPv6 over IPv4 manual tunnel supports RIPng, OSPFv3, and BGP4+.
For details on route configurations, see "IP Routing".
Procedure
- Access the system view.
- Create a tunnel interface and access the tunnel interface
view.
interface tunnel interface-number
- Set the tunnel encapsulation mode to manual tunnel.
tunnel-protocol ipv6-ipv4
- Specify the source IP address or source interface of the
manual tunnel.
source { ipv4-address | interface-type interface-number }
You can set the source address of a manual tunnel to the IPv4 address of the interface connecting to the IPv4 network or configure this interface as the source interface.
Moreover, you can specify a physical interface or a logical interface such as the loopback interface as the source interface.
- Specify the destination address of the manual tunnel.
destination ipv4-address
The destination address is the source address of the peer device. As shown in Figure 1, the source IP address of FW_A is 1.1.2.1/24 and that of FW_B is 1.1.1.1/24.
- Enable the IPv6 function on the tunnel interface.
- Specify an IPv6 address for the tunnel interface.
ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length }
Example
FW_A and FW_B are border devices between IPv6 and IPv4 networks. The IPv4 address of the GigabitEthernet 0/0/1 interface on FW_A that connects to the IPv4 network is 1.1.1.1/24, and the IPv6 address of the interface that connects to the IPv6 network is 2011::1/64. The IPv4 address of the GigabitEthernet 0/0/1 interface on FW_B that connects to the IPv4 network is 1.1.2.1/24, and the IPv6 address of the interface that connects to the IPv6 network is 3011::1/64. The IPv6 over IPv4 manual tunnel is established between FW_A and FW_B.
# Set the encapsulation type, source address, and destination address of the tunnel, and the IPv6 address of the tunnel interface for FW_A.
<FW> system-view [FW] sysname FW_A [FW_A] ipv6 [FW_A] interface tunnel 1 [FW_A-Tunnel1] tunnel-protocol ipv6-ipv4 [FW_A-Tunnel1] ipv6 enable [FW_A-Tunnel1] source 1.1.1.1 [FW_A-Tunnel1] destination 1.1.2.1 [FW_A-Tunnel1] ipv6 address 3001::1 64
# Configure a route from FW_B to the IPv6 network.
[FW_A] ipv6 route-static 3011:: 64 tunnel 1
# Set the encapsulation type, source address, and destination address of the tunnel, and the IPv6 address of the tunnel interface for FW_B.
<FW> system-view [FW] sysname FW_B [FW_B] ipv6 [FW_B] interface tunnel 1 [FW_B-Tunnel1] tunnel-protocol ipv6-ipv4 [FW_B-Tunnel1] ipv6 enable [FW_B-Tunnel1] source 1.1.2.1 [FW_B-Tunnel1] destination 1.1.1.1 [FW_B-Tunnel1] ipv6 address 3001::2 64
# Configure a route from FW_A to the IPv6 network.
[FW_B] ipv6 route-static 2011:: 64 tunnel 1