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by cassianoleal 549 days ago
Check the IPv4 address on your WAN. If it's in the 100.64.0.0/10 range [0], you're on CG-NAT.

Furthermore, run

    curl ipv4.icanhazip.com
If the address you get back is different from the one on your WAN interface - assuming your Gateway is your ISP rather than, say, a VPN - you must be on CG-NAT.

[0] https://en.wikipedia.org/wiki/Carrier-grade_NAT#Shared_addre...