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ChapTEr 3
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Exchange Environmental Considerations
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The client and server software needs to support IPv6 to use it. The following Microsoft server operating systems support IPv6:
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Windows Server 2003 (IPv4 is installed and enabled; IPv6 is not installed by default.) Windows Server 2008 (IPv4 and IPv6 are installed and enabled by default.) Windows Server 2008 R2 (IPv4 and IPv6 are installed and enabled by default.)
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Microsoft also recommends that you do not turn off Ipv6 in a clustered
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environment because Windows Server 2008 r2 Clustering uses Ipv6 for internal communication.
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Not only does the server need to support IPv6, but also the client operating system. The following Microsoft client operating systems support IPv6:
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Windows XP Service Pack 1(SP1) or later (IPv4 is installed and enabled; IPv6 is not installed by default.) Windows Vista (IPv4 and IPv6 are installed and enabled by default.) Windows 7 (IPv4 and IPv6 are installed and enabled by default.) For more information about IPv6, see the IPv6 for Microsoft Windows FAQ at http://go.microsoft.com/fwlink/ LinkId=147465. Notes from the field
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Hardware Provider Recommended to Disable IPv6 for Windows Server 2008
or a recent project I consulted my server hardware provider, who recommended turning off Ipv6 because their network interface card (NIC) drivers caused
problems especially when using NIC Teaming. The operating system was Windows Server 2008; thus we used the following registry key to disable Ipv6 from all LaN interfaces, connections, and tunnel interfaces:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\ DisabledComponents set to 0xFFFFFFFF (DWORD type)
after a reboot, even IpCONFIG.exe no longer showed Ipv6 addresses. You can find more information on how to disable Ipv6 at http://support.microsoft.com/kb/929852/.
Evaluating Network Topology
ChapTEr 3
Windows Failover Clustering on Windows Server 2008 r2 requires Ipv6 and the Exchange 2010 Database availability Group uses some elements of Windows Failover Clustering. however, Exchange 2010 does not use Ipv6 within a DaG. This does not mean that you can disable Ipv6. Even though the DaG neither depends on nor uses Ipv6, disabling Ipv6 completely for Windows Server 2008 r2 is not a tested scenario and could therefore result in unpredictable consequences for a DaG.
Ipv6 for Exchange Server 2010
Because Exchange Server 2010 runs on Windows Server 2008 or R2, you might think that it automatically supports IPv6. However, you should consider a few things before planning for IPv6 and Exchange 2010. The following Exchange Server roles can cause issues when using IPv6 addresses:
Hub or Edge Transport Features such as IP Allow List Providers or Sender
reputation do not support IPv6 because they require static IP addresses.
Unified Messaging All features do not support IPv6 but need IPv4 to work
correctly.
Client Access Server Autodiscover and EWS Web services endpoints because you
cannot configure an IIS binding for an IPv6 address WCF throws a Watson exception if you try to configure it.
Database Availability Group (DAG) Even though you cannot define an IPv6 DAG
IP address, IPv6 is supported. When static IPv4 addresses are specified for a DAG, it only uses IPv4. When no static IPv4 address is specified, Exchange use DHCP for the IPv4 addresses and also creates IPv6 address resources.
Exchange Server uses the Windows network stack to process any request. Each request depends upon two things:
Name resolution (when initiating the request) Packet type (when receiving a request)
First, the name resolution will determine how to initiate the request to another computer based on which address (IPv4 or IPv6) is resolved first. When the name resolution comes back with an IPv6 address, this address is used to initiate the request. Second, packet types do not mix IP versions midstream. If the request comes in as IPv4, the response will also use IPv4, and the same is true for IPv6. As for unfulfilled requests, they should be handled before name resolution is completed and would otherwise fail after name resolution in the same way other transient network failures occur. For features that don t support IPv6, Exchange causes the request to fail so that the client initiates another request using IPv4. Thus an IPv6 request, even to the Unified Messaging role, does not cause a problem but is just ignored.
82 ChapTEr 3 Exchange Environmental Considerations
Note
The official Microsoft support statement for Ipv6 is that Exchange Server 2010
running on Windows Server 2008 or r2 requires an Ipv4 address. Exchange Server 2010 is not supported in a pure Ipv6 environment where you disable the Ipv4 protocol.
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