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Forum Discussion

Steele6599_8766's avatar
Steele6599_8766
Icon for Nimbostratus rankNimbostratus
Mar 25, 2014

SMTP load balancing with Exchange 2010

So I setup the load balancing on our F5 but now have an issue with the receive connectors.. in the past we had different receive connectors on our Hub Transport for different external users. Depend...
application delivery
design
LTM
microsoft
Dayne_Miller_19's avatar
Dayne_Miller_19
Historic F5 Account
Mar 25, 2014

Hi Markus-

 

BIG-IP will replace the original source IP of incoming connections with one of its own when you have Source Address Translation (otherwise know as SNAT) enabled on the virtual server.

 

Since your BIG-IP system is replacing the address with its own self IP address, it's likely that you have this value set to 'Auto Map'. Setting it to 'None' should change the behavior to preserve the original source IP address.

 

However, you must make sure that your Hub Transport servers have a route back to the source network(s) through the BIG-IP--in other words, using the self IP address that's on the same local subnet as the Hub Servers as the gateway. SNAT removes the need for this route, but if you disable SNAT, you'll need to have it in place.