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4g Cellular WAN

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KD2HKB
4g Cellular WAN
Hello all,
I have an idea for a portable WAN node, but wanted to ask what the general opinion would be regarding a WAN connection on AREDN.

What my idea was is using a 4G modem, whether USB (connected to a GL-inet node?) or a 4g/ethernet modem (particularly thinking of the Netgear LB1120/1121) & putting the modem in bridge mode (thereby giving the AREDN node the "Public IP"). My question/concern about this is whether the firewall on the WAN side is secure/strong enough for a publicly addressable/accessible connection? This would be the equivalent in putting the mesh node in a DMZ or whatever.

The main reason I was thinking of this was to prevent having to forward any ports or deal with an extra (unneeded?) firewall/DHCP server/NAT that the modem would provide normally.

My use case was for a WAN go kit which could be used to offload data to the internet (if available). The same kit could also be used to provide internet at remote repeater sites.

I guess this would also beg the question... would a node, say a GL-Inet AR750, support a USB 4G modem and use it as it's WAN? Or is there a device that has 4g that AREDN will run on?

And yes, I know I'll get a lot of replies related to "AREDN is not for distributing the internet"... "it's meant to be it's own network not dependent on the internet" and others. I get that. BELIEVE ME... I get that. I just also see it as a good option to have an internet connection, for instance, the repeater site for a club I'm a member of. That site is an RF island right now, but we would still like to utilize AREDN. So, we need to tunnel back to our hub/datacenter.
KD2HKB
Clarification
For a bit of clarification... I guess I'm most interested in the advisability of having the wan interface directly connected to a modem. Without another firewall between the node and the modem.
KD2HKB
My mind works too fast sometimes...
To further confuse things... I'm not really convinced how I want to design my go box. Another idea I had would include a firewall (pfsense) which could allow for multiple wan [read wan failover]. If I did it this way... I envision I could use one wan interface for an ethernet connection, maybe one connected to a wifi client radio and then cellular being a third wan. With such a failover setup, ethernet would be the preferred connection method and cellular being the wan of last resort.
w8erw
w8erw's picture
Cellular Hot Spot MESH Go Box
Some time ago I put together something that may be the same or similar to your concept.  My design started with an orange plastic ammo box and included one of those likely Chinese 4G modem/router units from Amazon, a Mikrotik hAP AC Lite AREDN Node, a Ubiquity AirRouter HP AREDN Node and a CISCO SPA112/Analong telephone for Hamshack Hotline.  I was rather amazed at how well this all plays together.  I have internet where ever I want it, portable and mobile. This connectes well to the AREDN MESH locally and remotely via a tunnel VTUN when necessary.  And the Hamshack Hotline works very well behind the AREDN MESH.  I also have a DMR Hotspot that can be added easily and it functions as it should.  Everything fits well inside the ammo box with the antennas extended outside the box.  The one issue I have not attended to is power.  There are 24V, 12V and 5V devices.  Right now I use wall warts that came with the devices and an outlet USB charger combination that distributes the AC power and drives the USB powered devices.  I have what I need to do that all on standard 12V, just have not gotten to it yet.

Jim W8ERW  w8erw@arrl.bet
 

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