316 Understanding IPv6, Second Edition

References

The following references were cited in this chapter:

■RFC 3056 — “Connection of IPv6 Domains via IPv4 Clouds”

■RFC 3068 — “An Anycast Prefix for 6to4 Relay Routers”

You can obtain these RFCs from the \RFCs_and_Drafts folder on the companion CD-ROM or from http://www.ietf.org/rfc.html.

Testing for Understanding

To test your understanding of 6to4, answer the following questions. See Appendix D, “Testing for Understanding Answers,” to check your answers.

1.Describe the intended use of the 6to4 IPv6 transition technology.

2.How can you recognize a 6to4 address?

3.How are the source and destination addresses in the encapsulating IPv4 header determined for 6to4-tunneled traffic?

4.To reach a native IPv6 host on the IPv6 Internet, IPv6 packets from a 6to4 host must traverse 3 native IPv6 routers on an intranet, 13 IPv4 routers on the IPv4 Internet, and 6 native IPv6 routers on the IPv6 Internet. If the IPv6 packets were sent by the 6to4 host with a Hop Limit field of 128, what is the value of the Hop Limit field when the packets are received at the destination?

5.A network administrator needs to begin experimenting with IPv6-only Web sites on the IPv6 Internet. Describe how the network administrator can configure a computer running Windows Server 2008 as a 6to4 router to immediately obtain connectivity to the IPv6 Internet.