Hello!

I have two CAS/MB servers in my test lab - Exch1 and Exch2 (20.1.1.11 and 20.1.1.12 respectively) - and I was very surprised to see them "talking" to each other using their 6TO4 virtual adapters:

Q1: Is this behaviour normal for Exchange 2013SP1?

Q2: What if I disable 6TO4 adapter?

Thank you in advance,

Michael

• Edited by MF47 21 hours 27 minutes ago typo

Hi Michael,

Exchange 2013 servers fully support IPv6 networks. Therefore, even if you aren't using IPv6, you don't need to disable IPv6 on your Exchange servers.

Microsoft recommendation is to leave there even if you are not using IPv6.

Disabling it should not break anything as such, keeping it on doesn't hurt as well (similar to keep the UM service running on CAS, MBX)

"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 7, Windows Vista, Windows Server 2008 R2, or Windows Server 2008, or later versions, some components will not function. Moreover, applications that you might not think are using IPv6such as Remote Assistance, HomeGroup, DirectAccess, and Windows Mailcould be."

Some useful information:

Disabling IPv6 And Exchange Going All The Way

http://blogs.technet.com/b/rmilne/archive/2014/10/29/disabling-ipv6-and-exchange-_1320_-going-all-the-way.aspx

IPv6 support in Exchange 2013

https://technet.microsoft.com/en-us/library/gg144561(v=exchg.150).aspx

Q. What are Microsoft's recommendations about disabling IPv6?

https://technet.microsoft.com/en-us/network/cc987595.aspx

Hi Satyajit321,

Thank you for the reply!

...but it didn't answer my questions...Perhaps my first question was formulated bad - I meant should Exchange servers use 6TO4 virtual adapters for the mailflow?

And Q2: What if I disable 6TO4 adapter? (not IPv6!)

Regards,

Michael