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> the WAN IP on your router will match the "what is my ip" website, but the problem is that it will also match many other people's routers That's interesting.
by hunter2_ 3y ago
> the WAN IP on your router will match the "what is my ip" website, but the problem is that it will also match many other people's routers
That's interesting. So the ISP is directing packets at the various customer routers using some other identifier than the WAN IP the router sees? MAC address or something?
- dwattttt 3y agoI don't specifically know, but typical NAT can use stateful flow information, i.e. "a UDP packet originated from inside the NAT to external IP/port X, packets from that external IP/port should be routed to the originating NAT/customer" (see https://en.m.wikipedia.org/wiki/UDP_hole_punching https://en.m.wikipedia.org/wiki/UDP_hole_punching)
- LilBytes 3y agoSome ISPs use MAC address filtering. HFC (Hybrid Fiber Coaxial) and FttN (Fiber to the Node) are such examples. The rest of them if you don't have a static IP or an internet routable address, use NAT (Network Address Translation) and in some even more exotic environments they use Port Address Translating (PAT), but it's been many years since I've seen PAT in any way at commercial, residential or enterprise setups in ISP space. But PAT is quite common in the reverse and forward proxy space.