That does sound like it’s exactly what I’m looking for.
Unticked that and rebooted, then tried to send an sms - success!
This might be a stupid question: How do I test if internet access is actually blocked now?
Try pinging 8.8.8.8.
Try opening www.google.com.
Try syncing time with a ntp server.
As a second thought, maybe it is better/safer to set "use-network-apn=no" AND manually providing a non-existing APN.
They are coming from your PC I guess, the router sees them, but ignores.
Regarding SMS, my modem has some problems with that (goes down after sending the message), so didn't try it. But if it doesn't affect internet, it won't affect SMS either I think. You need to try it yourself, it could be different for different modems.
Discourse has a very stupid notification system. VERY stupid. If we choose 'Watching', it will notify about every message in the topic, turning notifications into spambox. If we choose 'Tracking' (personally I have this setting by default), it notifies user if his name was mentioned, if his message was quoted, or if 'Reply' to his message was used, it doesn't notify about general replies in the topic.
How do I ping anything using a specific interface? I don’t use the kit to connect my PC to the internet, it’s only in the same network and I access it through the LAN bridge.
That is weird. I’m not using the kit to connect my PC to the internet, so it’s either something Router OS does on its own or it’s something that happens while Winbox/the web interface is open.
What does your device do when it “goes down”? I can send a single sms just fine but it won’t send two in a row.
Okay, going to use direct replies then, thanks.
I don't understand your question, can you post an example of what you would want to do (and cannot)?
You said that I can check if lte1 is still connected to the internet by pinging e.g. Google’s DNS server. My PC doesn’t use the kit to connect to the internet, including lte1, it’s only in the same network. When I ping anything with command prompt on my PC, then it uses its own, regular internet connection with the regular router, not the kit. I know that I can use the “ping” command in WinBox’ terminal but that’ll use the bridge (LAN interface). How do I use the LTE interface specifically to test if it’s still connected to the internet? Do I have to set up a new bridge for LTE (while keeping “use network APN” disabled, of course) and disable the LAN one?
On the router you can use this:
ping 8.8.8.8 interface=lte1
But your PC is connected to the router, right? I think, some link-local related IPv6 packets are going out from your PC, and the router just sees them.
It becomes unavailable immediately and you need to reboot the router or restart interface. But it's the issue with my modem firmware.
Thanks! Sadly this is working, so looks like unticking “network APN” isn’t sufficient.
I’m going to look into how I can set up a new fake APN and use the firewall for lte1 tomorrow.
Not directly. They’re both connected to the same LAN switch, which is connected to my regular router. IPv6 isn’t set up on my PC (it’s unticked in the settings of my PC’s LAN port) and there’s no PC in this network that is using it either. Very weird.
Okay, my kit isn’t doing that. It’s still available after sending the first one, it just doesn’t send the second for some reason (going to open its own thread for that). What FW are you on? My kit’s using 7.16.2.
This is a specific case, it will work even if there are no routes to this interface. In other cases it won't be used, if you don't have a route to it. But to be sure, just add 2 blocking firewall rules for output and forward, as was suggested.
You won't be able to ping through LTE with a "fake APN". And I'm not sure you'll be able to send SMS either, but not 100% on that. Agree with @teslasystems:
And if you're still having trouble, post your configuration. Since it confusing at what going on with your configuration.