Exchange 2016 DAG in Hybrid setup

Hi, I currently have a single exchange 2016 server with a hybrid connection to office 365.

We only use O365 for exchange protection and archives. All mailboxes are stored internally.

I use a split DNS with a certificate

I am looking to add a second exchange server in a DAG so that maintenance can be performed on the primary server without any down time.

Looking for a bit of advice about how people would set up a DAG in a hybrid scenario.

I would presume I would set the DAG up internally with an IP Address, change to point to that IP address.

Make sure I have the cert installed on both exchange servers.

Run the hybrid installation again to add both exchange servers to 365? Or can I only have the one connecting for the hybrid?

Am I correct with how I think I need to set up? Would I need to make any other changes etc?

Any advice is appreciated :)
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MaheshConnect With a Mentor ArchitectCommented:
Do not point IP to DAG virtual IP

DAG cannot help you to connect clients to Exchange CAS component should remain pointed to Exchange server primary NIC

There is nothing changed for DAG setup in hybrid

U do need two network cards on each exch 2016 server and then form DAG and provide one VIP to DAG, infact you don't need any DAG VIP, you can create IP Less DAG

Hybrid will remain connected to both Exchange 2016 server as long as pointing to both exch servers.
No special action is required for that
CaptainGibletsAuthor Commented:
So I just create the DAG without an IP

Create a second A record that points to the second exchange server as well.

But if the primary server goes down, clients still wont be able to connect through ActiveSync?
MaheshConnect With a Mentor ArchitectCommented:
have you changed active sync virtual directory on 2nd server to point to

If yes, please wait sometime to replicate dns entry and then check
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CaptainGibletsAuthor Commented:
I haven't installed the second server yet. I am trying to make sure I know exactly what I am doing before doing any installation.

Would changing the AS VD to allow users to connect to the second server if the first was down?
MAS (MVE)Connect With a Mentor Technical Department HeadCommented:
Hi CaptainGiblets,
Make sure MSR proxy enabled on both servers.
Get-WebServicesVirtualDirectory | fl server,mrs*

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MaheshConnect With a Mentor ArchitectCommented:
I thought you have created 2nd server should point to both exchange servers
you do need two host records ( with internal and external dns pointing to both server Ips
also make sure all virtual directories on both servers and autodiscover SCP should point to
lastly as MAS pointed out, enable MRS proxy on both servers which is responsible for mailbox movement back and forth (OnPrem to cloud and vice versa)
MAS (MVE)Connect With a Mentor Technical Department HeadCommented:
As commented by Mahesh do not use DAG IP (for  Just create 2 A records with your common name ( points to two IPs which is DNS RoundRobin. i.e. Load balance the traffic between servers.
CaptainGibletsAuthor Commented:
Its now configured and working, thanks for all your help.
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