USB modem diagnostics

maestromaestro
edited March 6 in Firebox - Networking, Multi-Wan, VLAN, NAT, SD-WAN

Hello,

I setup a Pantech UML295 USB modem on WatchGuard Firebox T15 for Internet redundancy many years ago, and I am trying to troubleshoot it now remotely, because the users were not able to connect to Internet when the main Internet connection went down.

So, I use Network tab of Diagnostics page in WebUI to

ping -I eth0 8.8.8.8
and I get
PING 8.8.8.8 (8.8.8.8) from "IP address" eth0: 56(84) bytes of data...

and when I do
ping -I modem0 8.8.8.8
I get
PING 8.8.8.8 (8.8.8.8) from "IP address" modem0: 56(84) bytes of data...

and I get replies both times, but I am confused seeing the same "from IP address" of the main Internet connection of interface eth0, when I am actually trying to ping using modem0 interface.

I suppose this is probably normal behavior, just want to confirm.

Aslo, the USB modem has Red light on it. Can someone remind me if this is because it is just a backup connection and does not pass the traffic when the main connection is up?

Thanks.

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