Apoc, I have complete respect for you so I will gladly educated you.
MAC Address is a layer 2 protocol, on the OSI model (think Switches)
IP Address is a layer 3 (TCP is layer layer 4). (think Routers)
Your LAN PC talks layer two (ethernet frames (think packets) (MAC addressed)) with the switch and router on your network. Your switch/router knows what MAC = What local IP (ARP table).
When your PC requests an IP address from, say a DNS lookup of GGG servers, it asks the LAN if it knows the MAC address of that IP. The switch/router will reply that it does not and tell you to send your request to the default gateway (DG). (We now starting talking solely in IP Address from your PCs point of view and GGGs server) The DG has an outward facing MAC and IP address, and the router does the same thing, questions its DG if it knows the location of the router that can get the request to the GGG servers. This continues, no more ARP (form our point of view) since we are IP only now and the eventual outcome is a IP packet reaching the external router (Boarder Gateway router) of the GGG servers, and the router there knows that the IP address being requested, and port, belong to a MAC address within the Network (not so true, there can be more routers inside GGG but you get the idea). Yes, the GGG router sees a MAC address but it is the MAC address of the router last in the chain to talk to the GGG router. Yes the GGG router sees your routers IP address (in the IP Packet) so it knows where to send the reply
If you like something deeper, a youtube with a cisco exam simulation of the above.
Understanding ARP (Address Resolution Protocol) - YouTube
If you really wanta go the deep end, read this.
How network works. MAC-address and IP-address relationship.
So.. unless, which it well could be, the PoE client is sending the local LAN MAC address, and a bunch of other identifying data, of the PoE clients host to the GGG servers via
an in game channel, such as on first logon, then changing your MAC address is.. pointless. Changing your routers MAC address is pointless. Changing your IP is not pointless and the above explains why.
tl;dr MAC address is not routable.. it does not go beyond the LAN, it stops at your router.
WIMM
edit: herp derp