I'm having issues using Firewalla with the Technicolor C2100T router. When I originally set up our Firewalla about 2 weeks ago, we were using the ZyXEL C1100Z router and Firewalla worked very well. However, on Dec 29 we upgraded our CenturyLink internet service from 100mbps to 1000mbps and were forced to upgrade the router to the Technicolor C2100T.
I reset Firewalla to factory settings and deregistered the device from my iPhone and got Firewalla working with the new router. However, it does not work reliably. Firewalla seems very sluggish when responding to any change--approving a new device takes 30-60 seconds. And in some cases, Firewalla has blocked some of my family's devices when they 1st join the network. In one case (a Windows 10 laptop), I couldn't get Firewalla to allow internet access at all, even though the device was approved with status = Monitoring according to the iOS app. For now, I've disabled Firewalla by setting Monitoring Mode = Off.
As I said above, Firewalla worked well with our original router so I'm hoping that these compatibility issues with the new router can get resolved eventually. I noticed 2 other Technicolor models were on your list of routers that do not support DHCP mode.
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