I have a need to split the traffic going to and coming from my Exchange server based on service. Currently I have both SMTP and 443 traffic coming into and going out of the same ISP (we'll call it A). ISP A is also the default for all incoming and outgoing traffic. I want to split this to have SMTP traffic coming and going through ISP B and leave the 443 traffic on ISP A.
I think I can do this with PBF rules but I'm not totally sure how to go about it. If so here are some questions that I have.
Do I need to create 1 PBF or 2? Incoming and outgoing or just outgoing?
Do I need to create NAT rules for the PBF traffic? I already have NAT for the stuff on ISP A.
Do I need to create regular policies in addition to the PBF. eg. allowing incoming port 25 etc.
Or, am I barking up the wrong tree. I looked at the document for branch office with two ISP's and there are similarities here, but I only want to do this for the one service and not use it for failover at this time.
Thanks in advance,
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