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Date: Tue, 15 Mar 2016 10:16:51 +0900 (JST)
Message-Id: <20160315.101651.626351874531260985.kato@vanilla.ocn.ne.jp>
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin unable to resolve hostnames
From: Jun-ya Kato <kato AT win6 DOT jp>
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> Is anybody here affected by this problem willing to give this a test?
> I can create another Cygwin 2.5.0 test release pretty soon...

I think it's useful workaround for cygwin user under VMware NAT.
I'd like to test it.






From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Subject: Re: Cygwin unable to resolve hostnames
Date: Mon, 14 Mar 2016 10:54:59 +0100

> On Mar 14 09:34, Jun-ya Kato wrote:
>> It also depends on AAAA query againt VMware's DNS proxy server.
>> 
>> For more analysis, see vmware community site,
>> https://communities.vmware.com/thread/518949?start=15&tstart=0
>> 
>> 
>> I think it is not cygwin's bug at all. but any workaround may be
>> implemented againt weak behavior of GetAddrInfoW() API.
> 
> As mentioned in the above posting, Cygwin always sets AI_ALL if
> ai_family is PF_UNSPEC and the hints don't specify AI_ADDRCONFIG.
> 
> Apparently Winsock's GetAddrInfoW chokes on AI_ALL in certain
> circumstances.  On GLibc, AI_ALL is ignored if AI_V4MAPPED is not given,
> but that's not as I observed it on Windows when I added this code
> (back in Vista times, but hey).
> 
> There's an easy workaround possible:  If GetAddrInfoW returns the
> error code WSANO_RECOVERY (per the above posting), we can retry
> without the AI_ALL flag.
> 
> Is anybody here affected by this problem willing to give this a test?
> I can create another Cygwin 2.5.0 test release pretty soon...
> 
> 
> Thanks,
> Corinna
> 
> -- 
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Maintainer                 cygwin AT cygwin DOT com
> Red Hat

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