I recently purchased an Apple Extreme 802.11ac router, as my trusty, old WRT54G running dd-wrt has finally died. I’m not too happy that this router doesn’t support stateful packet inspection — I need to know what my kids are viewing. Other than that, it’s been super easy to setup.
Anyway, my AT&T 3600HGV modem is running on (somewhat) bridge mode (see here), so I needed to allow my AirPort Extreme to accept DHCP renewal packets, so it didn’t keep trying to renew it’s public IP from AT&T. All you need to do is:
Save the settings, update, and that’s it.