Brocade Communications Systems 6650 IPv6 over IPv4 tunnels, Configuring a manual IPv6 tunnel

IPv6 over IPv4 tunnels 5

IPv6 over IPv4 tunnels

NOTE

This feature is supported only with the IPv6 Layer 3 PROM and the full Layer 3 image.

To enable communication between isolated IPv6 domains using the IPv4 infrastructure, you can manually configure IPv6 over IPv4 tunnels that provide static point-point connectivity.

As shown in Figure 10, these tunnels encapsulate an IPv6 packet within an IPv4 packet.

FIGURE 10 IPv6 over an IPv4 tunnel

IPv6 Traffic Over IPv4 Tunnel

IPv6

Network

IPv4

Network

IPv6

Network

IPv6 Host Dual-Stack L3 Switch Dual-Stack L3 Switch IPv6 Host

IPv6 Header IPv6 Data

IPv4 Header

IPv6 Header

IPv6 Data

IPv6 Header IPv6 Data

In general, a manually configured tunnel establishes a permanent link between switches in IPv6 domains. A manually configured tunnel has explicitly configured IPv4 addresses for the tunnel source and destination.

This tunneling mechanism requires that the Layer 3 switch at each end of the tunnel run both IPv4 and IPv6 protocol stacks. The Layer 3 switches running both protocol stacks, or dual-stack routers, can interoperate directly with both IPv4 and IPv6 end systems and routers. Refer to “Configuring IPv4 and IPv6 protocol stacks” on page 111.

IPv6 over IPv4 tunnel configuration notes

•The local tunnel configuration must include both source and destination addresses.

•The remote side of the tunnel must have the opposite source/destination pair.

•A tunnel interface supports static and dynamic IPv6 configuration settings and routing protocols.

•Duplicate Address Detection (DAD) is not currently supported with IPv6 tunnels. Make sure tunnel endpoints do not have duplicate IP addresses.

•Neighbor Discovery (ND) is not supported with IPv6 tunnels.

•If a tunnel source port is a multi-homed IPv4 source, the tunnel will use the first IPv4 address only. For proper tunnel operation, use the ip address option.

Configuring a manual IPv6 tunnel

You can use a manually configured tunnel to connect two isolated IPv6 domains. You should deploy this point-to-point tunnelling mechanism if you need a permanent and stable connection.

To configure a manual IPv6 tunnel, enter commands such as the following on a Layer 3 Switch running both IPv4 and IPv6 protocol stacks on each end of the tunnel.

Brocade ICX 6650 Administration Guide	121
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