I posted a few weeks back about how there is no good reason to disable IPv6 on SBS 2008 and how I was pretty sure that you should not do the same on SBS 2011 either. Well Microsoft’s SBS support team have posted that indeed you should not do it. Their blog post here lists some of the problems that can be had if you disable IPv6 on SBS 2011. They also show how to disable it correctly if you have to do it.
I’m yet to have anyone give me a reason as to why you should disable it on either SBS 2008 or SBS 2011.
What we have found is that when receiving (from sbs2011 host behind firewall) spam filters and SMTP gateway appliances review the message headers they find that the “received from” host IP is IPV6 and that is a problem. The hostname could be correct and IF their system does a reverse lookup confirmation they can find the IPV4 information but if they don’t, the SMTP connection may be refused. This is what we are looking at and subject to specific confirmation. Also, of less concern is the way the header also shows the originating host IP, generally a private IP (NAT’ed to public on the outside w/RDNS object defined). The RDNS item does not confirm the IPV6 address.
One reason to diaable IPv6 is if you are installing the Blackberry Enterprise Server. It won’t install otherwise.
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