03-05-2015, 09:10 PM
Internet connection gone and now back.
Along the way, I rebooted everything, unplugged/replugged the cable connection, even, to get a new IP from Comcast. At one point only a computer connected directly to the modem could get online. Initially, the Apple router reported nothing amiss even though it wasn't online (AirPort Utility in all flavors is a bit stupid sometimes, as the front panel green/amber light can be in my experience.)
So I swap in my old, backup router. It never even saw the modem. Remember, I'm rebooting things in sequence still, waiting for diagnostics to finish etc. Comcast supposedly no longer locks in connected MAC addresses downstream but you never know for sure.
I swapped Ethernet cables with no luck. I was about to reconfirm with just a laptop again but swapped back in the Airport Extreme and initially the same issue, then disconnected the Ethernet and put it back in and suddenly BAM connected. I promise you it was connect well previously.
What I learned is that whether or not the modem *thinks* the Ethernet connection to the router is good isn't based on reality and this is shown both by its front panel status light and behavior. Maddening. I can't troubleshoot non-repeatable, intermittent failures.
Along the way, I rebooted everything, unplugged/replugged the cable connection, even, to get a new IP from Comcast. At one point only a computer connected directly to the modem could get online. Initially, the Apple router reported nothing amiss even though it wasn't online (AirPort Utility in all flavors is a bit stupid sometimes, as the front panel green/amber light can be in my experience.)
So I swap in my old, backup router. It never even saw the modem. Remember, I'm rebooting things in sequence still, waiting for diagnostics to finish etc. Comcast supposedly no longer locks in connected MAC addresses downstream but you never know for sure.
I swapped Ethernet cables with no luck. I was about to reconfirm with just a laptop again but swapped back in the Airport Extreme and initially the same issue, then disconnected the Ethernet and put it back in and suddenly BAM connected. I promise you it was connect well previously.
What I learned is that whether or not the modem *thinks* the Ethernet connection to the router is good isn't based on reality and this is shown both by its front panel status light and behavior. Maddening. I can't troubleshoot non-repeatable, intermittent failures.