kirk1233 That makes sense. Your gateway is going to request an address from the DHCP pool. The MAC is the unique identifier. Most gateways have a way to forge the WAN MAC, so you can “copy” it over to a replacement device and retain that functionality.
CG-NAT on modern big iron hardware really shouldn’t have any meaningful impact on performance as long as they’ve built/scaled it to meet demand. All those translations are offloaded to ASICs now. Even just 1ms added latency is surprising to me.