Which protocol is used for communicating between VM-Series firewalls and a gateway load balancer in...

Geneve (Generic Network Virtualization Encapsulation) is the protocol used for communication between VM-Series firewalls and a Gateway Load Balancer (GWLB) in AWS. Geneve provides a flexible encapsulation method and is specifically supported for integrating with AWS GWLB to ensure seamless traffic flow and security inspection.

References:

AWS Gateway Load Balancer Documentation:AWS GWLB

Palo Alto Networks Integration Guide: Integrating VM-Series with AWS GWLB