> If your modem is doing NAT there's literally no reason for this setup. Unless you wanted more options than your crappy router/modem gives you. > And it woul

> If your modem is doing NAT there's literally no reason for this setup. Unless you wanted more options than your crappy router/modem gives you. > And it would cause even more issues because you'd have two DHCP servers on the same subnet offering up more than one IP. No, I specifically said the modem would have to not act as a DHCP server at all, just turn it off. > Even if you set the LAN side of the modem to disable DHCP and only offer a static address, you've still got both the "public" NAT address and "private" in the arp table of all of your hosts. Incorrect on two counts. 1) ARP tables only store address translations for your subnet precisely because all addresses not on your subnet must be reached through a gateway. 2) there are only two addresses in the modem<->pi subnet because the pi is performing NAT/PAT for your "LAN" subnet. > You will absolutely run into issues. Maybe, it has been a while since I've done anything this silly, but as I recall from doing stuff like this in a lab I had no issues shoving as many subnets as I wanted to on the same network without VLANs. > If you have the modem spitting out DHCP addresses and the PI spitting out DHCP addresses [...] You don't. You disable DHCP on the modem.