Exchange 2013 - DAG

Hi there, setting up a new Exchange 2013 DAG (we currently have 2007 and will be moving over to 2013 shortly all being well), i'm setting up a DAG and just wondered do the DAG NIC's need to have a default gateway on them? I have 2 Mailbox servers which have 2 NIC's each (General and DAG). At present i'm just configuring the NIC's before I create the DAG, they can obviously see each other without the gateway as they are on same subnet.

Hope that makes sense!
TerellionAsked:
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MAS (MVE)EE Solution GuideCommented:
It is strongly recommended to have 2 NICs on each server one for replication and one for client communication.
Client communication network should have your gateway configured.
and replcation network does not need gateway and DNS  server addresses and untick the register DNS option in the NIC properties of replication network.
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TerellionAuthor Commented:
Superb thanks,

I have 2 CAS Servers, 1 NIC for general communication and 1 NIC for NLB
2 MBX Servers, 1 NIC for General comms and 1 NIC for DAG. Yep I unticked register DNS option already but great to know don't need a gateway thanks! :)
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Marwan OsmanCommented:
Each network adapter must be configured properly based on its intended use. A network adapter that's used for a MAPI network is configured differently from a network adapter that's used for a Replication network.

The MAPI network typically uses a default gateway, although one isn't required.

The Replication networks typically don't have default gateways, and if the MAPI network has a default gateway, no other networks should have default gateways. Routing of network traffic on a Replication network can be configured by using persistent, static routes to the corresponding network on other DAG members using gateway addresses that have the ability to route between the Replication networks. All other traffic not matching this route will be handled by the default gateway that's configured on the adapter for the MAPI network.


https://technet.microsoft.com/en-us/library/dd638104(v=exchg.150).aspx
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