I followed the guide at this URL to setup the Dual ISP for outbound access.
I have set the http/https services to use ISP 2 and other traffic to use ISP 1. It is working find and the redundancy also working fine.
However, I have 2 web services that hosting using ISP 1. I have setup the destination NAT and required policy but it is not working when the 2 ISP link is up. If i disconnect the ISP 2, the destination NAT is working fine.
I also tried to setup the PBF rule for Symmetric Return using ISP 1 using the following guide.
The log details when the Dual ISP + Symmetric PBF is define. It just showed incomplete and aged-out. From Client wireshark, it keep resending the TCP transmission.
The result when disable the PBF for Symmetric returna and disconnect ISP 2.
Is there any other thing I need to do in order to allow dual ISP and destination NAT to work? Appreciate if someone can give me a hint on this.
I think you will need to modify your PBF filter rule for the web server to work. What might be happening is the http/https traffic from the server in reply to the inbound dNAT is being picked up and sent to ISP 2.
Add to that filter a negate ip address source for the internal address of your web server so that it is not covered by the forwarding filter.
I figure out the problem.
When i added the PBR for this destination NAT, i did not specific the next hope. The Interface and Server VLAN are different. That why.
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