DirecTV DVR not seeing internet via router TC

I installed a modem Arris SB6183 on Comcast xfinity network.  The modem is turned on and connected to the network, xfinity without problem.  All my other devices connected to the TC and could see the internet without problem.  (Though, as I write this I realize that they were all apple devices.)  However my Directv DVR (HR44-500) did not see the internet via the wireless or ethernet cable.  My TC is a 3 TB A1470.  The installer has been in DHCP + NAT.  I also tried to give Directv a (local) fixed IP which address found DVR, but still couldn't find the internet.  When I plugged the DVR directly to the SB6183, without going through the TC, he saw the internet seems to indicate a problem of TC.

After a few days of futile efforts, I have reconnected the router xfinity and replace the TC in Bridge mode.  Everything is working now and the DVR sees the internet, but I'm still pay Comcast 10 $par month to rent their modem.

Does anyone else have this problem?

You need to clarify a few things.

I would expect questions for Internet access to the DVR by the TC without doing manual port forwarding. The DVR itself must be connected to the internet as long as you have the correct values for IP etc. Although I suspect that ipv6 might complicate the situation.

If the DVR awaits UPNP router compatible... the TC is a failure. Apple is not compatible UPNP, adopting instead their own port open NAT - PMP protocol which is limited to most of the time the Apple products.

To get out, you need to return to the configuration without your xfinitiy router... and give us a stack of screenshot... To see the complete configuration of the RECORDER and the TC... screenshots are the best way to do it.

DNS, in particular, can be a problem... so make sure you use Google public DNS on the DVR and see if that helps.

Any other suggestions we really need to see all your settings...

Some screenshots of a working Mac or iPad would also show the configuration of a unit of work... rather than the DVR has failed.

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