For some reason I’m thinking there was a way to make it prefer IPv4 without
disabling IPv6. As I said however, it has been a long time so I could be
virtualizing that reality. J
--
There are 10 kinds of people in the world...
those who understand binary and those who don't.
From: [email protected] [mailto:[email protected]] On
Behalf Of Michael B. Smith
Sent: Friday, February 3, 2017 10:37 AM
To: [email protected]
Subject: RE: [NTSysADM] Exchange sending via IPv6
It does apply to Exchange, but the same “not supported” comment comes into play.
From a bit of PowerShell I have for server core…
### Hive = HKLM
[string]$ipv6_keyName = "SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters"
[string]$ipv6_valueName = "DisabledComponents"
[int]$disableAll = 0xffffffff
[int]$enableAll = 0
[int]$tunnelBit = 0x01
[int]$nonTunnelBit = 0x10
[int]$IPv4PrefBit = 0x20
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Melvin Backus
Sent: Friday, February 3, 2017 9:48 AM
To: [email protected]<mailto:[email protected]>
Subject: RE: [NTSysADM] Exchange sending via IPv6
I seem to recall there being reg hack for Windows that would make IPv4 the
preferred choice. I don’t know if applies to Exchange or not, and it’s been a
few years since I looked at it.
--
There are 10 kinds of people in the world...
those who understand binary and those who don't.
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Michael B. Smith
Sent: Friday, February 3, 2017 9:21 AM
To: [email protected]<mailto:[email protected]>
Subject: RE: [NTSysADM] Exchange sending via IPv6
This is 2017 and it doesn’t speak IPv6?
Yes, Exchange starting with 2013 will definitely prefer IPv6 over IPv4.
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Kelsey, John
Sent: Friday, February 3, 2017 8:15 AM
To: '[email protected]'
Subject: RE: [NTSysADM] Exchange sending via IPv6
Yes, the Sophos appliance is set as a smart host. I’m currently using the FQDN
of the appliance. I’ll try using its IPv4 address.
Thanks!
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]] On Behalf Of Kurt Buff
Sent: Thursday, February 02, 2017 11:57 PM
To: ntsysadm
Subject: Re: [NTSysADM] Exchange sending via IPv6
Are you using the Sophos appliance as a smarthost? Are you using the FQDN of
the appliance, or its IPv4 address? If the former, try the latter.
I'd verify the vendor's claim, BTW - "netsh trace" is your friend:
https://msdn.microsoft.com/en-us/library/windows/desktop/dd569142(v=vs.85).aspx
and
https://blogs.msdn.microsoft.com/canberrapfe/2012/03/30/capture-a-network-trace-without-installing-anything-capture-a-network-trace-of-a-reboot/
Kurt
On Thu, Feb 2, 2017 at 8:13 PM, Kelsey, John
<[email protected]<mailto:[email protected]>> wrote:
Working on a new Exchange 2013 install. Outbound emails are failing and our
front-end email appliance vendor (Sophos) says its failing because Exchange is
sending the outbound emails using its ipv6 address instead of its ipv4 address
and the Sophos appliance doesn’t understand ipv6 ( I know, right?)
I don’t see any obvious place to configure this in Exchange, and I know that
disabling ipv6 in Exchange is baaaaaad.
So can I force Exchange to send only using its ipv4 address somehow?
Thanks all.
***************************************
John C. Kelsey, MCSE, CCNA
Network Architect
Penn Highlands Healthcare
•: 814.375.3073<tel:(814)%20375-3073>
• : 814.375.4005<tel:(814)%20375-4005>
•: [email protected]<mailto:[email protected]>
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for the intended recipient(s). If you are not the named recipient you should
not read, distribute, copy or alter this email. Any views or opinions expressed
in this email are those of the author and do not represent those of Penn
Highlands Healthcare or its affiliates.. Warning: Although precautions have
been taken to make sure no viruses are present in this email, the company
cannot accept responsibility for any loss or damage that arise from the use of
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