SMTP intern

Eprs_Admin
Eprs_Admin used Ask the Experts™
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Hi Experts,

I have EXCHANGE 2007 running with 2 HUB CAS server.
So I have 2 SMTP Servers.
Is it possible to have one IP which point to both SMTP servers intern ?

For example when I receive emails from extern, they are going to one IP and then load balanced to both SMTP servers.

I want the same for internal network.
Is it possible ?
On my fortigate I can setup LNB but cannot configure it for internal traffic.
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What is the internal IP your current NLB is using that your external access is pointing too?  

Or is the load balancing configured at a firewall level and it just round robins SMTP requests to the IP of's of both SMTP servers?....

You basically need an NLB setup, which as part of the process you would create a VIP and associated DNS A record which would server internal requests.

You can configure a CAS array which takes it one step further...
Eprs_AdminSystem Architect

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Commented:
do you have a step by step guide for an CAS array ?
Eprs_AdminSystem Architect

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Commented:
As I mentioned I have EXCH2007 with 2 HUB-Transport servers.
The CAS Array is not available in EXCH 2007.
How can I go on ?
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Very true, no CAS array in 2010.

It depends on what you are trying to load balance.  

The below will allow you to set up the load balancing internally for CAS services (OWA, OAB etc).  However SMTP traffic is natively load balanced by the hub transport servers.  So any SMTP requests that fail on one hub server will fail over to the other...

The link below give you the NLB details for load balancing

http://www.msexchange.org/articles-tutorials/exchange-server-2007/high-availability-recovery/load-balancing-exchange-2007-client-access-servers-windows-network-technology-part1.html
Eprs_AdminSystem Architect

Author

Commented:
Now I found out why I have NLB and Loadbalancer on my FORTIGATE.

Fortigate Loadbalancer is just from extern -> internal traffic.
NLB is configured to have one access point for my smtp traffic -> internal.
Eprs_AdminSystem Architect

Author

Commented:
CAS is available first in EXCH2010.

In EXCH2007 no CAS is available, here you can setup NLB.
Eprs_AdminSystem Architect

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Commented:
Thanks a lot my friend.

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