Using PBF To Split Services Between ISP's

Showing results for 
Search instead for 
Did you mean: 

Using PBF To Split Services Between ISP's

Not applicable

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,



Kenton...I don't see a problem but you may want to research this.  Maybe your ISP-B can offer some insight on having the inbound & outbound split.

Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!