Comcast SMC and Airport Extreme

So, recently I switched to Comcast Business Class internet due to my work causing me to go over those ridiculous 250gb caps. But ever since they put in that SMC modem I have been hating the fact that now the modem was acting as a DHCP server and not my Airport Extreme, this was causing some issues with “BackToMac” amongst other things..

Here’s what i did to solve this:

I unchecked everything under Lan and Firewall and made sure that the Comcast SMC box is really acting just as a modem. I kept the default 10.1.10.1 IP and the subnet mask. Since I don’t subscribe to the Comcast static IP i will be still stuck with the IP the modem passes on ( 10.1.10….) but at least modem isn’t the one handing over the IP’s so i have more options..

Then on the airport utility i manually told it to use router address 10.1.10.1 and assigned it address on the same subnet (even though SMC box is not handing anything out anymore)

Then i told the Airport to distribute range of IP’s (if you use option of sharing public ip you will get some NAT translation conflicts) and that’s it. So now my SMC is just handling internet traffic and the airport handing out IPs and NAT stuff.