Re: Cygwin unable to resolve hostnames

[Carl-Erik Kopseng <carlerik@gmail.com>]

> > I'm not sure when this started, but recently Cygwin has been unable to
> > resolve (certain) hostnames.
> >
> > Example:
> >  wget github.com
> > --2015-07-22 15:17:04--  http://github.com/
> > Resolving github.com (github.com)... failed: Non-recoverable failure
> > in name resolution.
[snip]

I have the same problem and I have just made a clean Cygwin64 install
on a computer that has never had Cygwin installed before. I have not
messed with any settings, yet I also cannot use curl or git to access
almost any site. Only the built-in Windows CLI  tools, such as `ping`,
works.

> > Any ideas?
>
> Cygwin by default uses the same resolution as Windows, that means that
> you have something in Cygwin's configuration that affects resolution.
> First and most obvious is /etc/resolv.conf; by default I don't think
> there is one, but you can create it and Cygwin will use it.

Pointers on what to actually put in that file?

> Next would be if you have more than one DNS resolver in your (Windows)
> network configuration, this means that any one of them can be used at
> any time (literally it should be random)... and by coincidence Cygwin is
> using one that doesn't work, the Web browser is using another, and
> things change with different tests. Run 'ipconfig -all' and see under
> the network adapter what's listed for "DNS Servers".
>
> Also if there is more than one network adapter something similar to the
> last paragraph will happen. I would think that Cygwin uses the DNS
> servers on the "default" adapter.

I am guessing my problems have something to do with this part, as I am
running Windows 8.1 in VMWare. VMWare adds lots of weird network stuff,
all of which I am not too familiar with ...

The below output is from `ipconfig /all`. Could any of the info be put
in the aforementioned resolv.conf file?


Windows IP Configuration

   Host Name . . . . . . . . . . . . : macbookpro
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : localdomain

Ethernet adapter Bluetooth Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Bluetooth Device (Personal Area
Network) #2
   Physical Address. . . . . . . . . : 00-50-56-E2-FB-E9
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Ethernet0:

   Connection-specific DNS Suffix  . : localdomain
   Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network
Connection
   Physical Address. . . . . . . . . : 00-0C-29-6A-39-52
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::20b9:f45e:9310:3f4a%9(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.244.145(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, December 11, 2015 10:59:56
   Lease Expires . . . . . . . . . . : Friday, December 11, 2015 11:29:56
   Default Gateway . . . . . . . . . : 192.168.244.2
   DHCP Server . . . . . . . . . . . : 192.168.244.254
   DHCPv6 IAID . . . . . . . . . . . : 167775273
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-89-39-FB-14-10-9F-E1-7B-95
   DNS Servers . . . . . . . . . . . : 192.168.244.2
   Primary WINS Server . . . . . . . : 192.168.244.2
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . :
2001:0:5ef5:79fb:867:2876:3f57:b6e(Preferred)
   Link-local IPv6 Address . . . . . : fe80::867:2876:3f57:b6e%7(Preferred)
   Default Gateway . . . . . . . . . : ::
   DHCPv6 IAID . . . . . . . . . . . : 218103808
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-89-39-FB-14-10-9F-E1-7B-95
   NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.localdomain:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : localdomain
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes


Regards
Carl-Erik Kopseng

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