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iRules Recipe 3: Pool and SNAT Selection by Host Header Value

The Problem You manage a number of web sites, and they are spread across servers in several different pools. You want to use a single public IP for all of these, so you need to make a pool selecti...
Updated Jun 05, 2023
Version 2.0
application delivery
BIG-IP
iRules
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I am an F5 Solutions Architect for Service Providers in the Americas, focusing on Virtualization, SP protocols (Diameter, GTP, DNS) and programmability. Prior to joining F5, I worked as a Wi-Fi Network Engineer for a large U.S. public University, as an Operations Engineer, a network management Software Engineer, and as a Technical Trainer.
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VernonWells
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Oct 25, 2018

For a given incoming request, you can either redirect or perform pool selection, but not both. That's because a redirect is a direct response from the BIG-IP platform to the client, and there is only a client flow, whereas pool selection specifies the destination for the server-side flow.