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When specified, the value of the TTL field from the IPv6 header is used in the

IPv4 header.

Default : 64 seconds

Example 183 Configuring a TTL for the Packet

HP Switch(tunnel-3)# tunnel ttl 100

Example: Manual 6in4 Tunneling

This example creates an IPv6 6in4 tunnel, which allows IPv6 hosts in one network to exchange

IPv6 data with hosts in another IPv6 network by using the IPv4 tunneling infrastructure. In this

example:

• All IPv6 traffic between hosts in the 3000::/64 and the 4000::/64 networks is tunneled

through Switch B and Switch C, respectively.

• Switch B and Switch C are the manually configured endpoints.

• IPv6 traffic entering the tunnel endpoints is encapsulated with an IPv4 header based on the

6in4 configuration, and then routed through the IPv4 network using Switch A as the first hop.

• Static IPv6 routes are used to route into the tunnel interfaces.

Figure 28 Example of Manual 6in4 Tunneling

Configure Switch B

1. Configure the Tunnel Endpoint for Switch B

The tunnel endpoint for Switch B is configured with:

• Mode—6in4

• Source—encapsulation information for the IPv4 header indicating the source IPv4 address

• Destination—encapsulation information for the IPv4 header indicating the destination

IPv4 address

• IPv6 Address—IPv6 network assigned to the interface (much like VLAN assignments).

Enables IPv6 on the interface. It is required in order to route over the interface.

266 IPv6 Tunneling Over IPv4 Using Manually Configured Tunnels