DNS and BIND on IPv6

DNS and BIND on IPv6

Cricket Liu

Language: English

Pages: 54

ISBN: 1449305199

Format: PDF / Kindle (mobi) / ePub

If you're preparing to roll out IPv6 on your network, this concise book provides the essentials you need to support this protocol with DNS. You'll learn how DNS was extended to accommodate IPv6 addresses, and how you can configure a BIND name server to run on the network. This book also features methods for troubleshooting problems with IPv6 forward- and reverse-mapping, and techniques for helping islands of IPv6 clients communicate with IPv4 resources.

Topics include:

  • DNS and IPv6—Learn the structure and representation of IPv6 addresses, and the syntaxes of AAAA and PTR records in the ip6.arpa IPv6 reverse-mapping zone
  • BIND on IPv6—Use IPv6 addresses and networks in ACLs, and register and delegate to IPv6-speaking name servers
  • Resolver Configuration—Configure popular stub resolvers (Linux/Unix, MacOS X, and Windows) to query IPv6-speaking name servers
  • DNS64—Learn about the transition technology that allows clients with IPv6-only network stacks to communicate with IPv4 servers
  • Troubleshooting—Use the nslookup and dig troubleshooting tools to look up the IPv6 addresses of a domain name, or reverse-map an IPv6 address to a domain name

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@terminator.movie.edu. soa movie.edu. has the same effect as % dig @2001:db8:cafe:1::1 soa movie.edu. To look up a AAAA record, just specify aaaa on the command line: % dig aaaa suckerpunch.movie.edu. or % dig suckerpunch.movie.edu. aaaa Either way, the output will look something like this: ; <<>> DiG 9.8.0 <<>> suckerpunch.movie.edu. aaaa ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21059 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY:

http://twitter.com/oreillymedia Watch us on YouTube: http://www.youtube.com/oreillymedia Acknowledgments Many thanks to my long-time editor, Mike Loukides, for suggesting this book in the first place. (Though now he’s going to start pressuring me to get going on the sixth edition of DNS and BIND.) Thanks also to my boss at Infoblox, Steve Nye, who supported the project, and to my old friend and co-conspirator in the Ask Mr. DNS podcast, Matt Larson, who helps keep my DNS skills from

IPv6 network and how to troubleshoot problems with IPv6 forward- and reverse-mapping. It even covers DNS64, a DNS-based transition technology that, together with a companion technology called NAT64, can help islands of IPv6-only speaking hosts communicate with IPv4 resources. Audience I wrote this book for DNS administrators who are rolling out IPv6 on their networks and who need to understand how to support IPv6 on those networks with DNS. This ebook covers the underlying theory,

would correspond to the reverse-mapping zone 9.f.0.0.e.f.a.c.8.b.d. Remember that DNS is case-insensitive, so we could also have called the zone 9.F.0.0.E.F.A.C.8.B.D. or even 9.F.0.0.e.F.a.C.8.b.D., if we’d been feeling punchy. They all would have handled reverse mapping of IPv6 addresses just as well. As with IPv4 reverse-mapping zones, IPv6 reverse-mapping zones mostly contain PTR records. And as with any zone, they must contain one SOA

Mac OS X, to configure the name servers your resolver queries when using a different network interface, simply choose that interface instead of Local Area Connection. After reconfiguring your resolver to use IPv6, it’s a good idea to verify that DNS resolution still works with a tool such as dig or nslookup. See the chapter on troubleshooting later in this book for details. Dynamic Resolver Configuration IPv6 supports several methods for dynamically configuring a host’s IP address and

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