Problem Running Snort 3 Inline

I have run Snort as an IPS for a number of years in the inline mode. 
When using Snort 2 I didn't seem to have any problem inserting it 
between the modem and the router. Not so with Snort 3. When I put Snort 
3 between the cable modem and the router, the router loses connection to 
the internet.

In addition to going to Snort 3 I also upgraded my router to a Netgear 
Nighthawk MR60 Mesh Router.

Ubuntu is a fresh install of Ubuntu Desktop 20.04.6.  I used Noah 
Dietrich's writeup "Snort 3.1.18.0 on Ubuntu 18 and 20" to install Snort 
3.  I'm attaching the Snort 3 systemd service file I'm using and the 
Snort version file.

Any suggestions would be very much appreciated.

Jim Campbell

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