Carrier-grade NAT means the mobile carrier shares a public IP among many customers. The router receives a private address, so unsolicited inbound connections from the internet cannot be forwarded directly to it. Ordinary port forwarding or hosting a traditional inbound VPN server may therefore fail even when the router is configured correctly.
Options include an outbound VPN to a server with a reachable address, a managed remote-access platform, ZeroTier-style overlay networking, or a carrier private/public APN service. The best choice depends on security, scale, latency and who manages the infrastructure. Comset’s Network Management System and supported VPN functions may provide suitable paths for particular models, but the SIM plan and carrier configuration must also be checked.
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How does carrier-grade NAT affect inbound VPN and remote-access options on a cellular service?
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