After learning about CG-NAT and DHCP, in hindsight I’m wondering why it worked. I got a few ideas why but could someone explain?
Was it because it was all within LAN, and not remotely from outside LAN? So anything within LAN will work even under CG-NAT?
Was it because it was just the PC and the router, and doing something like sshing into PC from phone would’ve not worked? I.e, device-to-device wouldn’t work but device-to-router does?
Was it because I have both ipv4 and ipv6 (according to wifi settings on my phone), and ipv6 isn’t affected by CG-NAT?
I can’t remember exactly what the issue DHCP brings for port forwarding, remote access, ssh, etc. is but I feel like there was something and the solution was static IP or DDNS. Might’ve been a selfhosting thing? idk
CGNAT affects accessing your LAN from outside your network, i.e. over the Internet. Traffic within your own LAN is not affected whatsoever.
Try access it using mobile data.
Local will work because it is your network. Outside of that depends on ISP.
A LAN works without the Internet at all. CG-NAT is the internet for you. So anything LAN related is free of cg-nat restrictions.
DHCP could change your internal IP, so it’s nice to have static IPs sometimes.
It is possible your router supports hair-pinning or (NAT loopback).
When it detects you are trying to access the external IP address (even if it is cg-nat) it is smart enough to router the data basin internally and some are smart enough to apply firewall rules as well…