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Dick Summers

Exchange 2016 second IP address?

I have a client who hosts their own Exchange 2016 server.

They have redundant ISPs (ISP1, ISP2) with static IP address, and DNS MX records for each ISP mail server ISP

(mail.domain.com, mail2.domain.com).

A test of the ISP redundancy shows browser traffic works fine, but email does not flow when ISP1 is disconnected.

The client’s firewall is set up to receive email on ISP1 with the published mail.domain.com IP address.

I think I need to add a second server object to the firewall to accommodate the mail2.domain.com, which is no problem, but the firewall wants a separate internal IP address.

Would the Exchange server and/or Active Directory be unhappy if I added another IP address to the Exchange server’s NIC properties?

If this would work, it seems I would also need to add another DNS zone in active directory (mail2.domain.com),

Thoughts?  Am I missing anything?

asked09/23/2019 19:49
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Mariette Knap

If you add another IP to the Nic in that server you must also make sure all of your Connectors are configured to include that IP address depending on the way they are configured. I sometimes see Connectors that are bound to a complete subnet like /24 but also to individual IP addresses. If for some reason that new IP address is not included nothing will work.

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Last Activity 09/26/2019 08:14

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