I currently use CSS11500's at two of my sites and I'm able to use source-groups to achieve site load-balancing behind a single VIP. So basically I have a VIP that has servers in both the local site and remote site. Is something like this possible with the CSM? I suppose there's the nat server or nat client commands, but I'd like to be able to maintain original client IP address if possible, or at least maintain the original client IP for connections that stay local to the site.
With this config, the CSM checks global access list 2, anything that matches a source of 5.5.x.x subnet would go to the serverfarm with the remote servers. Anything that does not match 5.5.x.x would use the default serverfarm under the vip (No_Nat serverfarm). This is not optimal, but there is no parity between CSM and CSS when it comes to per-server NAT.
Yes, with the ACE modules or appliance, you can nat more selectively than CSS or CSM. With HTTP flows, the ACE can also insert the origonal source ip of the client into the http header so that you can maintain the client's IP for logging reasons.
Inserting the source IP is for HTTP only. To be clear - ACE can actually insert, remove, or modify any HTTP header. ACE does have the ability to loadbalance based on almost any L4-L7 data fully, but the engine that does the HTTP modification is specific to that protocol.
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