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Re: Resolving ipv6 address to rendezvous name
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Re: Resolving ipv6 address to rendezvous name


  • Subject: Re: Resolving ipv6 address to rendezvous name
  • From: Marc Krochmal <email@hidden>
  • Date: Mon, 3 Jan 2005 11:50:04 -0800


On Jan 3, 2005, at 10:49 AM, Joshua Graessley wrote:


The usual API for resolving an address to a host name should work. I think getnameinfo is what you're looking for. If the IPv6 address is link-local, mDNS will be used to perform a reverse lookup. If the IPv6 address is not link-local, normal unicast DNS will be used.


-josh

On Jan 3, 2005, at 2:15 AM, Fazekas, Miklós wrote:

I have an IPv6 address, and i'd like to get the randezvous name of the machine. I've tried the CFHost sample code, but it seems it cannot do this.
(I've got IPv6 address from AFPVolMountInfo, and i'd like to get the name of the server)

Actually, getnameinfo currently doesn't work with IPv6 link-local addresses, and it's going to be a while before it's fixed. <rdar://problem/3621096>.


You'll need to use DNSServiceQueryRecord in /usr/include/dns_sd.h and then query for a PTR record named something like...

2.3.1.C.2.F.E.F.F.F.5.6.0.3.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.E.F.ip6.arpa .

See DNSServiceMetaQuery for an example of DNSServiceQueryRecord.

<http://developer.apple.com/samplecode/DNSServiceMetaQuery/ DNSServiceMetaQuery.html>

Best Regards,

-Marc
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References: 
 >Resolving ipv6 address to rendezvous name (From: "Fazekas, Miklós" <email@hidden>)
 >Re: Resolving ipv6 address to rendezvous name (From: Joshua Graessley <email@hidden>)

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