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Re: [revisited] DHCPv6 support needed by others as well...
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Re: [revisited] DHCPv6 support needed by others as well...


On 25/10/2009, at 4:06 AM, Ron Broersma wrote:

Update on the MacOSX situation: In 10.6 (Snow Leopard) all DNS queries now go via mDNSResponder. mDNSResponder queries for both the "A" and "AAAA" record, but after the first response it cancels the queries and shuts down the socket so that all other responses are rejected (port unreachable). Generally, the response to the "A" query will be first, so you will connect with IPv4, but sometimes the "AAAA" response will win and you will connect with IPv6. The first response wins and all others are lost.

So, this does not appear to be a case where Apple changed the preference, but rather introduced a serious bug in mDNSResponder or related code. Unless they were in a dual stack environment, or were trying to reach dual-stack web sites, they would have never noticed. The net effect is that most IPv6 interactions now shift back to IPv4 transport, and in some other scenarios you lose connectivity altogether. 

Have you reported the bug to Apple?
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References: 


 >[revisited] DHCPv6 support needed by others as well... (From: Fredrik Pettai <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Chris Leishman <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Fredrik Pettai <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Tim Chown <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Ron Broersma <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Michael Newbery <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Randy Turner <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Ron Broersma <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Andre-John Mas <email@hidden>)


 >Re: [revisited] DHCPv6 support needed by others as well... (From: Ron Broersma <email@hidden>)























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