What function does the STUN server provided by the vBond orchestrator perform?

The STUN (Session Traversal Utilities for NAT) server, when provided by the vBond orchestrator, helps SD-WAN Edge routers and controllers behind a NAT device discover their public IP address and port number. This is crucial for establishing secure tunnels and communication across the internet, as devices behind NAT only know their private IP addresses. Without STUN, these devices wouldn't be able to inform other SD-WAN components of their reachable public addresses. The other options are incorrect: STUN does not prevent sessions between different service providers, nor does it specifically manage unNAT-ed controller addresses while Edge routers are behind NAT. It also doesn't exclusively enable sessions between MPLS TLOCs using only public IP addresses; its primary role is NAT traversal for any transport.