School me on Cell Modem Troubleshooting Please!
 

Have you checked the documentation (PDF)?

I'm gathering that this is a combination modem/router. Every router I've ever used has offered configuration options, including the option of configuring the default gateway address for the LAN behind it, but I have no experience with this type of device.

The user manual that frankbell linked to doesn't mention that cell tower connectivity is needed in order to access the internal http server, and it wouldn't make sense in any case. Assuming that you can connect to it ok, can you at least ping the device successfully?
If the device is alive and has an active web server, I'd expect to see that reflected in the output of nmap...
with something like
If you don't get the expected responses from ping, telnet, or nmap, I'd be thinking that the device may be faulty.

I have this device.

You should be able to enter the web configuration page with no sim, no isp.

You should be able to change default IP as I recall.

You can use it's mac address and make a static arp entry to some subnet in your host computer and try to access the device that way. Don't forget to remove static arp entries when done. Or use your host computer in a static IP in default subnet.

I'd remove sim and try to do hard reset as in manual. Careful, those reset buttons are subject to breaking.

If you can access the web gui and use the default login as noted on back then you can go to the tools and see a lot of cell information.

Hope mine lasts at least a year or more.

Here's the results from the suggested commands
 

Here's the results of nmap and ping.

[root@localhost kbs]# nmap 192.168.5.1

Starting Nmap 6.40 ( http://nmap.org ) at 2018-01-16 22:23 EST
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.19 seconds



[root@localhost kbs]# nmap -Pn 192.168.5.1

Starting Nmap 6.40 ( http://nmap.org ) at 2018-01-16 22:27 EST
Nmap scan report for mobileap.qualcomm.com (192.168.5.1)
Host is up.
All 1000 scanned ports on mobileap.qualcomm.com (192.168.5.1) are filtered

[root@localhost kbs]# ping 192.168.5.1
PING 192.168.5.1 (192.168.5.1) 56(84) bytes of data.
^[^C
--- 192.168.5.1 ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10008ms

Edit: I just added ifconfig:

[root@localhost kbs]# ifconfig
enp1s0 Link encap:Ethernet HWaddr 20:CF:30:AB:7B:45
inet addr:192.168.225.42 Bcast:192.168.225.255 Mask:255.255.255.0
inet6 addr: fe80::22cf:30ff:feab:7b45/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:31149 errors:0 dropped:0 overruns:0 frame:0
TX packets:39542 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2730192 (2.6 MiB) TX bytes:4187530 (3.9 MiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:99477 errors:0 dropped:0 overruns:0 frame:0
TX packets:99477 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11107137 (10.5 MiB) TX bytes:11107137 (10.5 MiB)

As an aside, I must say that this thread illustrates what I like about Linux Questions: the synergy.

I jumped in with a flailing general sort of response based on a web search and a bit of personal experience, then persons who actually knew what they were talking about stepped up to help OP.

At the risk of sounding soppy, I must say that LQ is a very special internet place.

I added ifconfig to the command outputs.Could I please get some analysis on what the commands returned so I can get a starting point on how to understand this issue better?



Is "mobileap.qualcomm.com" the name of the modem chip?
Thanks in advance!

The ifconfig output you posted shows that the wired ethernet interface enp1s0 is currently assigned with 192.168.225.42 (/24 subnet), which means it won't be able to reach your mobile broadband router at 192.168.5.1. Did you make some (perhaps unintended) changes?

Best not to edit existing posts if you make changes, as it could change the context of where things were at and confuse the situation.

About this question...
Answer: No it's the hostname configured in the router, and will resolve to it's configured IP address.

@frankbell: I agree with your sentiments. It's a great global online community. :)

So why wouldn't the Dashboard open if I put '192.168.225.42' in the browser address bar? Netgear Support had me try this.

What does my 'wired eithernet address' have to so with reaching a address?
It's a specific identifier for the Network Manager correct? I could actually have more than one interface on the same physical wire.

Could I get a little background on this or a specific topic to search?

The router is your default (internet) gateway, and should have an IP address within the same subnet address space as your LAN hosts.

For example: My LAN
<Public IP address>ROUTER(192.168.1.1/24)--------(192.168.1.10/24)MY_PC

The address shown by your ifconfig output pertains to your PC, not the router address
The assigned default route can be got using
That should be your router's address (eg 192.168.225.1)

Hopefully these will help with your understanding...
http://www.think-like-a-computer.com...orking-basics/
https://www.lifewire.com/what-is-a-d...gateway-817771
https://www.networkworld.com/article...-beginner.html

What automated system/daemon changes the machines IP address and what is the best way to change it?

I see the Network Manager configuration window allows the choice of Automatic IP BootP/DHCP or manually entering it. I did not fool with it. Could MSEC have changed it?

Here's the code for ip route

[root@localhost kbs]# ip route
default via 192.168.225.1 dev enp1s0 proto static
192.168.225.0/24 dev enp1s0 proto kernel scope link src 192.168.225.42 metric 1

It depends on what network management tool your distro is using, (but dhclient and dhcpd are two possibilities). Ordinarily the router contains a DHCP server, and so a default DHCP configuration on the client is all that is required.

Ok, the 'ip route' info confirms that the router address is 192.168.225.1, so try that address in a browser.

Sorry but what makes the the computers address have the same network as the router? Something has to make them the same right?

Yes, DHCP takes care of that. Very basically, when first connected, your PC will send out a 'dhcp request', and the listening server will respond accordingly with offer of a lease. Ultimately, that's how the PC get's the IP address and default route needed to get connectivity.

Is the computer and modem directly connected via patch or crossover cable?



Power down everything. Power back up with directly attached modem.
I'd make computer static ip in some subnet. 10.10 or 192. or whatever.
Make a class subnet.
Make static arp entry using the modem's mac in that subnet you created.
Use the static ip entry in browser to see if you can access the management page.

I'm trying to manually configure the NetWork Manager at this point.
192.168.225.1 does not work to open the Dash Board.