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I wanted to know if Cox can see the Mac addresses in my network. I know they can see IP addresses, but are Mac addresses included? What if I use a VPN?
The modem has a MAC address and Cox keeps track of it but not for DHCP. Also, it's not what is plugged into the WAN port they track, but the WAN MAC of the router itself. You plug the modem into the WAN port.
Bruce said:What if I connect a Roku to the WAN port? Would my Roku be public?
The Roku would be offline. If you plug it direct into the modem then yes, it would be public and Cox would track the MAC address. Notice I say "modem" and not router or gateway(modem/router combo), for then it would not apply unless Cox has some network monitoring service running.
This is how I thunk it worked: the modem is both a DHCP client and a DHCP server.
If the modem boots...as a DHCP client...it sends a DHCP Request to the Provider, The Provider responds and assigns a public IP to the modem.
If the router boots and connects to the modem, the router sends a DHCP Request to the modem and the modem...as a DHCP server...assigns a sub-netted address to the router. This sub-netted address shouldn't be "seeable" and tracked due to IP exhaustion.
In regards to DHCP clients and servers, there is also a DHCP helper...which would be the modem....but would just forward the public IP to the router. Is this what Cox is doing: DHCP helping? My router isn't doing this.
Bruce said:the modem is both a DHCP client and a DHCP server.
The modem acts as a transparent bridge between the router and Cox's DHCP servers. It also acts as a client on a private 10.x.x.x subnet that is used for troubleshooting only. There is no server on the modem itself.
Not a "server" per se as a network service but running a dedicated service to what's connected to its WAN port.
Does Cox approve or update the firmware of my router?
Bruce said:Does Cox approve or update the firmware of my router?
Nope, the firmware is stored locally on the router's flash. The router manufacture updates the router support page with the latest firmware. Some router's have automated systems that check the firmware automatically. You may be confusing router firmware with modem firmware, which Cox does control.