Re:AWS Network Load Balancer
by bogomipz on Friday September 08, 2017 @03:21AM
(#15198434)
Direct Server Return works at layer 3 not layer 2, its routing and encapsulation - IP in IP, GRE etc.
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You can do it at layer 2 as well, but it requires that the load balancer have an interface on the same broadcast domains as the hosts.