Load balancing algorithms supported by Gateway Load Balancers

The load balancing algorithm is described in this blog post:

When GWLB receives a new TCP/UDP flow, it selects a healthy appliance from a target group using 5-tuple flow hash – Source IP, Destination IP, Transport Protocol, Source Port, Destination Port. Subsequently, GWLB routes all packets of that flow (both forward and reverse directions) to the same appliance (stickiness). For non-TCP/UDP flows, GWLB still uses 3-tuple (Source IP, Destination IP, Transport Protocol) to make forwarding decision.