pinging is returning ipv6

Just recently, whenever i ping my SBS it is returning a ipv6 address, why is that? i know simply adding -4 to the end will give me the ipv4 address, but why has it changed all of a sudden? also, some other server of mine are randomly changing from ipv4 to ipv6 as they please on different days when trying to ping them.
CiaranDeAsked:
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Glen KnightCommented:
Go in to the Network Connection screen and press the ALT button to display the hidden menu.

From the advanced menu change the binding order so that IPv4 is above IPv6.

When you can, reboot the server.  You should find the default will now be IPv4
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Sikhumbuzo NtsadaIT AdministrationCommented:
Or you can just disable IP virsion 6
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AustinComputerLabsCommented:
Just unchecking ipv6 is generally not a good idea. the following article explores that topic:

http://blogs.technet.com/b/sbs/archive/2008/10/24/issues-after-disabling-ipv6-on-your-nic-on-sbs-2008.aspx

If you uncheck the IPv6 protocol from your network interface card on your Windows SBS 2008 server you may see the following issues after a reboot:

•Microsoft Exchange services fail to start
•Server hangs at "Applying Computer Settings..."  (can eventually logon after 30 - 60 minutes)
•Network icons show as offline
•Some or all of the following events
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Glen KnightCommented:
Do not uncheck/disable IPv6 in an SBS environment, it will break SBS.  Anyone suggesting you do, is giving bad advice.
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Cliff GaliherCommented:
Pinging from vista/win7 defaults to ipv6 when it can. But when pinging by name, it is all about what ip (v4 VS v6) gets returned during name resolution, so you may get inconsistent results. It is usually nothing to worry about though.

 -Cliff
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bevhostCommented:
If you see IPv4, then your IPv6 stack is missing (eg XP) or broken.
When Pv6 stack is broken it can result in slower performance while IPv6 times out and falls back to IPv4
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CiaranDeAuthor Commented:
ok but why would it be doing this? e.g. sometimes showing v4, somethings showing v6 when doing pings.

as first post set with the binding, the order is set correctly v4 first, v6 second.

so why this? is there an issue with my SBS. Also, when pinging on the LAN within the domain is it the SBS that dictated v4/v6 results or the individual hosts themselves.
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OP_ZaharinCommented:
hi CiaranDe,
- i'm sharing a Microsoft article on disabling/enabling IPv6 components. as other experts have shared here, it is very dangerous to disable it. in this article, i found one part of the registry setting to set the server to use IPv4 instead of IPv6 however it is not stated by doing this, does it takes IPv4 as the first priority and at the same time did not disabling IPv6 or not:
"Type 0x20 to use IPv4 instead of IPv6 in prefix policy"
- if its not a major problem for your app/system in having IPv6, as other experts have adviced, do not try this.

- the article can be further read here:
http://support.microsoft.com/kb/929852
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bevhostCommented:
Is th eping program just using whatever address is returned by DNS?
Can you try pinging to the IPv4 and the IPv6 address to make sure both work at different times.

Are you sure you are getting differing results from the same machines each time.
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