Bridge Mode broken on my XFI 7

Well, in bridge mode, if your gateway isn't connected to to Xfinity with the channels bonded, you aren't going to be able to pass DHCP or DHCPv6 renew/rebind requests from your google WiFi. 

Ideally, on a cold power up, you'd sequence that with a power controller.  You send power to the bridge mode gateway first.  Wait for it to come up and join.  Then power on the Google WiFi after a long enough delay.  You have to mess with the timing on that a bit to get it right.

You will also run into problems if your gateway is spontaneously rebooting on you all the time.  It's less likely and IPV4 address will change on a short power fail, but an IPV6 address will change frequently.  *I'd add:  It gets to be important with gateways and routing for internal clients and perhaps other devices when leases and gateways change, and how that propagates to your internal clients, and what else you have setup.

Then it depends on if the LAN bounces when that happens on Xfinity gear (I don't know), and how your Google WiFi handles the "if-down/if-up" event when it does (I don't know that either).   I also don't know what google has for logging for that, but if that's all you got, it's not very helpful. 

On a netgear in bridge mode, if you power both the gateway and another device at the same time, the LAN comes up first.  An internal LAN management interface will be active at 192.168.100.1.  If another device is present, a dhcp server on the management network will assign that device a lease at 192.168.100.2.  Obviously, that isn't what you were looking for in bridge mode, but that's the way it works.  That temporary lease will expire (I think the lease is 15-30 minutes), and then you'll make a request that will be a pass-through to the ISP, it's just that it takes a while.  Power sequence is a better way to handle it.

Eventually, it should sort itself out, if your gateway stays connected long enough. 

If your internet is dropping frequently or your gateway is rebooting, take a look at troubleshooting your connection first:  https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0 

Hey There -

I've tried that multiple times actually. Never successful. Breaks after 5 minutes. Multipel online posts says to change ARP refresh rate but I don't see that as an option on my modem. But not sure if Comcast can just stop asking for handshakes every 5 minutes.