Via internet settings I know my router IP, the IP ISP Gives me, and the server feeding me.
Seeing that access to modem diagnostics cannot happen (192.168.100.1) unless modem is locked to ISP… I can’t use the IP ISP assigned to modem.
I ping two IP’s: my router (to prove it works) and ISP Server feeding modem.
The device I purchased off eBay does this, logging success & failures of pings to both IP’s.
If router pings successfully, but have packet loss on IP of server feeding modem, THAT, and event logs in modem should alert ISP of an issue, an a plan of attack to fix it.
This unit NP-02B, was originally to power cycle a modem that lost lock, but I’m using it to double check ISP Server feeding me. It can ping two different IP’s.
Not clear if device has secure software, so I isolate it from internet, and use an ICMP ‘Allow’ rule in firewall for the ping to isp server from IP of the NP-02B. No hits on device seen in couple years I’ve had it, so it isn’t trying to ‘phone home’.
P.S. the free PingPlotter program/App is an easy, free way to test for pings, and packet loss calculation.