Hi,
Let me ask one more question regarding load balancer because this is 
interesting topic.
From what I’ve seen both instances have the same IP and MAC Adresses for both 
interfaces (Righ, Left).  Normally separate instances of haproxy could have 
different addresses on the side of the backend Network. They will do checks 
individually. and probably could scale >2 instances.
Is it possible even theoretically that we could do that by only  change IP and 
MAC on the Backend Network Side ? In my mind we need only ECMP only for VIP 
Address, In Backend each instance could have unique mac and IP address.
  
Do you see this as possible scenario at all ? 

Kind Regards
Piotr Pieprzycki


> This configuration can cause asymmetric routing. Response for request going 
> from LB1 to a backend server could come back to LB2. LB2 does not have any 
> state for this response and hence will drop the packet. Without syncing all 
> the 
> TCP state it can lead to unpredictable results. To sync all state clustering 
> support is needed.


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