[SGVLUG] Windows DNS question

[Claude Felizardo]

Matthew, just to be sure, have you tried turning IPv6 back on to
confirm that the problem comes back?  Anything else change?  Reboot?

I generally turn off IPv6 for now as I know some of my older equipment
and applications do not support it.

I just checked my router, I have IPv6 enabled but looks like I only
have a four octet IP from my ISP so unless someone can give me a good
reason to try IPv6 I'll probably just leave things as is and let
others debug problems.

Claude



On Mon, Jan 27, 2014 at 1:32 AM, Matthew Campbell <dvdmatt at gmail.com> wrote:
> The DNS server is bind on RHEL 6.4 with CENTOS 6.5 updates.
>
> Turning off IPV6 suddenly made the bad times go away.
>
> I have been fighting a ghost all weekend and thought I had things fixed a
> number of times but they came back a couple of hours later.  I'll take this
> as a good sign but won't start celebrating yet.
>
> Why did that work and what was going on?  How did you know this was the
> problem?
>
> Was it intuition, prior experience or omniscience?
>
> Matt
>
>
> ---------
> Matthew Campbell
> Storage Solution Consultant
> Storage Design and Engineering
>
> Kaiser Permanente
> IMG-Systems Integration
> 99 S. Oakland
> Pasadena, CA 91101
>
> 626-564-7228 (office)
> 8-338-7228 (tie-line)
> 818-314-9897 (mobile phone)
> Green Center 3-North, 031W29
> ---------
> kp.org/thrive
>
>
> On Sun, Jan 26, 2014 at 11:34 PM, Mic Chow <zen at netten.net> wrote:
>>
>> Is your network running IPV6; if not then disable it in the Windows box.
>> What flavor is the DNS server; Microsoft?
>>
>> Mic
>>
>>
>> On 01/26/2014 10:50 PM, Matthew Campbell wrote:
>>
>> Ok, I'm more than a little frustrated.
>>
>> I installed a new DHCP/DNS server Friday.  I washed all my Windows and
>> can't do a thing with them:
>>
>> matt at Nala:201% ipconfig /flushdns
>> Windows IP Configuration
>> Successfully flushed the DNS Resolver Cache.
>>
>> matt at Nala:202% nslookup aslan
>> Server:  senge.campbell.littlelionstudios.com
>> Address:  172.28.1.2
>> Name:    aslan.campbell.littlelionstudios.com
>> Address:  172.28.2.100
>>
>> matt at Nala:203% ping aslan
>> Pinging aslan [172.28.2.111] with 32 bytes of data:
>> Reply from 172.28.2.111: bytes=32 time<1ms TTL=64
>> Reply from 172.28.2.111: bytes=32 time<1ms TTL=64
>>
>> matt at Nala:204%
>>
>>
>> WTF?!?  The IP address changed in the cache between the two calls or what?
>> Of course things are not working.  Any suggestions on how to diagnose?
>>
>>
>> Matt
>>
>> P.S.  Here's another example:
>>
>> matt at Nala:204% nslookup kiara
>> Server:  senge.campbell.littlelionstudios.com
>> Address:  172.28.1.2
>>
>> Name:    kiara.campbell.littlelionstudios.com
>> Address:  172.28.2.102
>>
>> matt at Nala:205% ssh kiara
>> ssh: Could not resolve hostname kiara: hostname nor servname provided, or
>> not known
>>
>> matt at Nala:206%
>>
>>
>> And here's the ipconfig:
>>
>> matt at Nala:206% ipconfig /all
>> Windows IP Configuration
>>    Host Name . . . . . . . . . . . . : Nala
>>    Primary Dns Suffix  . . . . . . . :
>>    Node Type . . . . . . . . . . . . : Hybrid
>>    IP Routing Enabled. . . . . . . . : No
>>    WINS Proxy Enabled. . . . . . . . : No
>>    DNS Suffix Search List. . . . . . : campbell.littlelionstudios.com
>> littlelionstudios.com
>>
>> Ethernet adapter Ethernet:
>>    Connection-specific DNS Suffix  . : campbell.littlelionstudios.com
>>    Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit
>> Ethernet
>>    Physical Address. . . . . . . . . : BC-5F-F4-4B-96-76
>>    DHCP Enabled. . . . . . . . . . . : Yes
>>    Autoconfiguration Enabled . . . . : Yes
>>    Link-local IPv6 Address . . . . . :
>> fe80::6c04:e86b:ac8e:4d78%12(Preferred)
>>    IPv4 Address. . . . . . . . . . . : 172.28.2.122(Preferred)
>>    Subnet Mask . . . . . . . . . . . : 255.255.0.0
>>    Lease Obtained. . . . . . . . . . : Sunday, January 26, 2014 10:43:04
>> PM
>>    Lease Expires . . . . . . . . . . : Monday, January 27, 2014 10:43:03
>> PM
>>    Default Gateway . . . . . . . . . : 172.28.0.1
>>    DHCP Server . . . . . . . . . . . : 172.28.1.2
>>    DHCPv6 IAID . . . . . . . . . . . : 264003572
>>    DHCPv6 Client DUID. . . . . . . . :
>> 00-01-00-01-18-96-BE-84-BC-5F-F4-4B-96-76
>>    DNS Servers . . . . . . . . . . . : 172.28.1.2
>>                                        172.25.0.1
>>                                        8.8.8.8
>>    Primary WINS Server . . . . . . . : 172.28.1.2
>>    NetBIOS over Tcpip. . . . . . . . : Enabled
>>
>> Tunnel adapter isatap.campbell.littlelionstudios.com:
>>    Media State . . . . . . . . . . . : Media disconnected
>>    Connection-specific DNS Suffix  . : campbell.littlelionstudios.com
>>    Description . . . . . . . . . . . : Microsoft ISATAP Adapter
>>    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
>>    DHCP Enabled. . . . . . . . . . . : No
>>    Autoconfiguration Enabled . . . . : Yes
>>
>> Tunnel adapter Local Area Connection* 11:
>>    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. . . . . . . . . . . :
>> 2001:0:9d38:6ab8:cb6:220c:53e3:fd85(Preferred)
>>    Link-local IPv6 Address . . . . . :
>> fe80::cb6:220c:53e3:fd85%14(Preferred)
>>    Default Gateway . . . . . . . . . : ::
>>    NetBIOS over Tcpip. . . . . . . . : Disabled
>>
>> matt at Nala:205%
>>
>> Thanks for any ideas on how to tackle this.  The Linux upgrade including
>> rebuilding 2 rack-mount servers from parts, OS installs, VM installs, App
>> installs and configuration took 4 hours.  I lost all day Saturday and all
>> day Sunday to this d*** windows quirk.
>>
>> Matt
>>
>>
>