On which VPN is NAT configured on the outgoing interface for direct Internet access?

VPN 0 is the transport VPN, also known as the public-facing VPN. It's where the WAN interfaces reside and is typically used for direct internet access. When a device in a service VPN (like VPN 10) needs to reach the internet, its traffic is often routed through VPN 0, where NAT is configured on the outgoing interface to translate private IP addresses to public ones. VPN 512 is the management VPN, used for out-of-band management traffic, not direct internet access. VPN 1 and VPN 10 are service VPNs, used for internal network segmentation and user traffic, and while they can access the internet, they typically do so by routing through VPN 0, where the actual NAT occurs.