Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: IPv6 "infecting" windows networks when a specific PC joins them

22 Aug 2012   #1
360fish

windows 7 pro 32 and 64 bit
 
 
IPv6 "infecting" windows networks when a specific PC joins them

I have a set of PCs which if connected to a windows network will make all computers on that network default to ipv6 when resolving names. This happens even if IPv6 is unchecked, if the ipv4 binding is set above 6 in the advanced properties of the network card. If any of these PCs joins a network with a point of sale system (Aloha) that system develops problems since Aloha does not like IPv6. At all. All computers including the aloha terms are Win7, 32 or 64 bit.

Reproduced this with different routers and network topologies.

For example, I take one of these particular PCs to my home network. Prior to the terminal going onto the network
ping localhost --> 127.0.0.1
ping computername --> 192.x.x.x

After the PC has joined the network, just attached to the same router, not on the same workgroup, etc., now all computers on the network return

ping localhost --> ::1
ping computername --> 08fe:xxxx (IPv6 address)
ping computername -4 --> 192.x.x.x
ping localhost -4 --> 192.x.x.x

This behavior continues even without IPv6 enabled on any adapter on the network. When the PC is removed from the network, all other PCs continue with the new behavior.

I have tried netsh winsock reset, net stop dnscache, netsh int ip reset.log hit, unchecking IPv6 in multiple places, ensuring binding order has IPv4 above IPv6 on all network adapters (none hidden) etc. It's like this PC infects other windows PCs with IPv6 ...

I have not tried disabling IPv6 from the registry or by Policy in my lab but I believe I tried this on previous network with no affect. Any thoughts appreciated


My System SpecsSystem Spec
.

22 Aug 2012   #2
360fish

windows 7 pro 32 and 64 bit
 
 

Issue solved! See MS KB How to disable IP version 6 (IPv6) or its specific components in Windows 7, in Windows Vista, in Windows Server 2008 R2, and in Windows Server 2008

Specifically, if the HKLM\system\currentcontrolset\services\tcpv6\parameters\disabledcomponents is not set to DWORD 0xFFFFFFFF then this behavior can occur.

The above key is from memory, see the MS KB for detailed information.
My System SpecsSystem Spec
22 Aug 2012   #3
chev65

Windows 7 Ult, Windows 8.1 Pro,
 
 

Quote   Quote: Originally Posted by 360fish View Post
Issue solved! See MS KB How to disable IP version 6 (IPv6) or its specific components in Windows 7, in Windows Vista, in Windows Server 2008 R2, and in Windows Server 2008

Specifically, if the HKLM\system\currentcontrolset\services\tcpv6\parameters\disabledcomponents is not set to DWORD 0xFFFFFFFF then this behavior can occur.

The above key is from memory, see the MS KB for detailed information.

You should be aware that when you disable IPv6 certain components of Windows networking will not work correctly.

The Argument against Disabling IPv6:

It is unfortunate that some organizations disable IPv6 on their computers running Windows Vista or Windows Server 2008, where it is installed and enabled by default. Many disable IPv6-based on the assumption that they are not running any applications or services that use it. Others might disable it because of a misperception that having both IPv4 and IPv6 enabled effectively doubles their DNS and Web traffic. This is not true.

From Microsoft's perspective, IPv6 is a mandatory part of the Windows operating system and it is enabled and included in standard Windows service and application testing during the operating system development process. Because Windows was designed specifically with IPv6 present, Microsoft does not perform any testing to determine the effects of disabling IPv6. If IPv6 is disabled on Windows Vista, Windows Server 2008, or later versions, some components will not function. Moreover, applications that you might not think are using IPv6—such as Remote Assistance, HomeGroup, DirectAccess, and Windows Mail—could be.

Therefore, Microsoft recommends that you leave IPv6 enabled, even if you do not have an IPv6-enabled network, either native or tunneled. By leaving IPv6 enabled, you do not disable IPv6-only applications and services (for example, HomeGroup in Windows 7 and DirectAccess in Windows 7 and Windows Server 2008 R2 are IPv6-only) and your hosts can take advantage of IPv6-enhanced connectivity.

Read more. http://technet.microsoft.com/en-us/m....cableguy.aspx
My System SpecsSystem Spec
.


23 Aug 2012   #4
360fish

windows 7 pro 32 and 64 bit
 
 

Chev65 thank you for your thoughtful reply. I have two issues with IPv6 - #1 the vendor I use for Point of sale, NCR / Aloha recommends disabling IPv6 in its build documentation for both front of house touchscreens and back of house servers. More importantly, this behavior I saw where IPv6 takes over IPv4 as the primary ... transport? as described in my OP where things like pings return IPv6 information unless I force the ping with -4.

This behavior spreads from computer to computer if one mis-configured machine joins the network (just the workgroup) then all machines on the network start 'defaulting' to this behavior.

The point of sale system uses very simple networking, Netbios must be forced on for all clients, no DNS no domain all data runs from shared folders. In this situation any change to the default network behavior causes dramatic, or subtle, issues with the software
My System SpecsSystem Spec
Reply

 IPv6 "infecting" windows networks when a specific PC joins them




Thread Tools





Similar help and support threads
Thread Forum
Laptop wired connection starts with "multiple networks", no Internet
Need help to resolve this long-standing mystery. My Lenovo W530 laptop runs perfectly in both wired and wireless environments, at home as well as "on the road". But when it is connected wired when fresh booting to Windows it always comes up with "multiple networks" showing as connected, but...
Network & Sharing
Please help - ipv6 "no network access" (amature with computers)
Hey I can successfully connect to my home network but when I click on "status" it shows my ipv6 with no network access. I can access browsers and games but constantly disconnect every minute or so. Please help 😔
Network & Sharing
internet slow as dialup ipv6 "no network access"
I have three Windows 7 computers and one Windows XP computers. my most recent Windows 7 computer (HP Pavilion a1423w) which originally had Windows XP on it was given to me saying "if you can fix it, you keep it" sort of deal. the Windows XP was loaded with viruses. I opened it in safe mode because...
Network & Sharing
"Limited Access" issues with all networks I connect to
I am getting the "Limited Access" problem on my home network and on a friend's network, any ideas? I surfed forums for 4 hours, still no success.
Network & Sharing
WIN7: Can connect to networks via WiFI, but get "No Internet Access"
First, please forgive me if this is formatted oddly- I am typing this on my Blackberry. For the past few months, I have been accessing the internet with my laptop's wifi through my neighbor's password-protected network (with his permission). I also sometimes go online using another neighborhood...
Network & Sharing
IPv6 status is "no network access"
I cant see any of my computers on my LAN. I have tried to use dhcp and static ip's. also have tried unchecking the ipv6 box. no matter what i try still seeing the no network access. any ideas anyone?
Network & Sharing

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 17:11.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App