GitHub user btzq added a comment to the discussion: Support for Autoscale, 
using VNF in L2 Networks.

@weizhouapache actually in my diagram above, im suggesting to not use VNF to 
provide Autoscaling Feature. Let the current logic work as is. 

The end result we are trying to achieve is to implement some sort of security 
implementation from the internet, just before it gets distributed to the VMs in 
the VPC. 

- Internet -> VNF -> Virtual Router -> Autoscale Grousp (Ideal Scenario)

But this is not possible because the default gateway must be the Virtual 
Router. 

So in my diagram, i was suggesting another way to achieve that is by having the 
Virtual Router, route traffic to the VNF. 
VNF will then return the traffic after processing. Then, the Router can 
continue to distribute the traffic to whichever services need it via the 
existing logic (Eg. Autoscaling)

The implementation would look like this.

- Internet -> Virtual Router -> VNF -> Virtual Router -> Autoscale Groups

GitHub link: 
https://github.com/apache/cloudstack/discussions/9158#discussioncomment-9615373

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