[SGVLUG] Windows DNS question

[Matthew Campbell]

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


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*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
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*kp.org/thrive <http://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?
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> Mic
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> On 01/26/2014 10:50 PM, Matthew Campbell wrote:
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>  Ok, I'm more than a little frustrated.
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>  I installed a new DHCP/DNS server Friday.  I washed all my Windows and
> can't do a thing with them:
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> *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
> <http://senge.campbell.littlelionstudios.com> Address:  172.28.1.2 Name:
> aslan.campbell.littlelionstudios.com
> <http://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 <http://172.28.2.111>: bytes=32 time<1ms
> TTL=64 Reply from 172.28.2.111 <http://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?
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> Matt
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> P.S.  Here's another example:
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> *matt at Nala:204% nslookup kiara Server:
> senge.campbell.littlelionstudios.com
> <http://senge.campbell.littlelionstudios.com> Address:  172.28.1.2 Name:
> kiara.campbell.littlelionstudios.com
> <http://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:
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> *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
> <http://campbell.littlelionstudios.com> littlelionstudios.com
> <http://littlelionstudios.com> Ethernet adapter Ethernet:
> Connection-specific DNS Suffix  . : campbell.littlelionstudios.com
> <http://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
> <http://isatap.campbell.littlelionstudios.com>:    Media State . . . . . .
> . . . . . : Media disconnected    Connection-specific DNS Suffix  . :
> campbell.littlelionstudios.com <http://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.
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>  Matt
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