Download DNS and BIND on IPv6: DNS for the Next-Generation Internet by Cricket Liu PDF

By Cricket Liu

If you are getting ready to roll out IPv6 in your community, this concise e-book offers the necessities you want to help this protocol with DNS. you will learn the way DNS used to be prolonged to house IPv6 addresses, and the way you could configure a BIND identify server to run at the community. This ebook additionally good points tools for troubleshooting issues of IPv6 ahead- and reverse-mapping, and methods for supporting islands of IPv6 consumers converse with IPv4 assets.

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Extra info for DNS and BIND on IPv6: DNS for the Next-Generation Internet

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If it doesn’t find any such records, it tries looking up A records for the same domain name. If it finds one or more A records, it doesn’t return them to the client (which can’t use them, anyway, and wouldn’t accept them, since it asked specifically for AAAA records). It “synthesizes” an equal number of AAAA records from those A records, embedding the 32-bit IPv4 addresses in 128-bit IPv6 addresses. Now the client believes the server supports IPv6 and that it can communicate with it directly. The client, then, tries to connect to one of these fictional—er, synthesized—IPv6 addresses.

Edu. edu > 34 | Chapter 5: Troubleshooting has AAAA address 2001:db8:cafe:f9::d3 And here’s how you’d reverse-map the address. Note that you don’t need to specify the query type explicitly—nslookup is smart enough to recognize the IPv6 address. edu. edu. arpa. edu. edu. edu. and % nslookup 2001:db8:cafe:f9::d3 dig The chief difference between nslookup and dig is that dig has no interactive mode: you specify everything at the command line. And dig is smart enough—in most cases—to differentiate between domain names and record types, so you can specify those in whichever order you like.

And, of course, the particular syntax required would vary depending on the make of routers you ran. I write “would” because RFC 6106 is very new (published in November 2010), so not much gear supports it yet, though there’s somewhat more support for RFC 5006, a precursor to RFC 6106. ) On the server side, Linux and various BSD operating systems have at least some support in rtadvd, the Router Advertisement daemon. 7 (“Lion”) is rumored to support RFC 6106. conf, the Linux version of rtadvd’s configuration file*: interface eth0 { AdvSendAdvert on; prefix 2001:db8:cafe:1::/64 { AdvOnLink on; AdvAutonomous on; }; rdnss 2001:db8:cafe:1::1 { }; }; * Note that the BSD operating systems use a substantially different syntax.

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