Hello,
I looked at this article Configuring ISP Load Balancing about setting up an ISP load balance configuration but it’s a little vague and I’d like to clarify a few things to understand the architecture.
In a simple example, I have a virtual server that directs inbound traffic to a load-balanced internal pool, say a couple of web servers.
When I add a 2nd ISP, I would create a 2nd self-ip, add it to the “external” vlan, create a 2nd virtual server with a new IP from the new ISP subnet, direct it to the same internal load-balanced pool.
What I’m a little confused by is: how is the response traffic going back to the client? In the manual above it mentions creating a SNAT list as automap. Or is this for something different? Does the default gateway of the BIG-IP get utilized here?
The manual also specifies creating an outbound VS directing traffic to the 2 ISP routers, but I’m guessing this is for use cases where the originating traffic is outbound from the internal network. Correct?
I appreciate any advice.