My battles with the LTE R11e-LTE modem
I would like to extend my previous post and describe how the LTE devices in remote locations were implemented.
1) View of installed equipment
In remote locations, the following network layout has been damaged in part due to historical reasons, and also to be able to take advantage of LTE multiAPN functionality.
The general diagram of network connections
(LTE Service Provider) <-> (LTE Modem in MultiAPN Mode) <-> (Remote Router) <-> (Devices)
In remote locations, the built-in system is as follows:
1) Installation of LTE modems
A view of built-in routers at remote locations that provide connectivity with devices installed in a given location.
2) Description of communication
The router with the LTE modem communicates using vlanes. For the two APN LTE configured in the modem, two vlans have been assigned to which the lte passthrough mode has been configured. On the router, the dhcp client runs on these two vlanes, which reads the addresses and configures the necessary routes using the script.
3) Problem with the modem.
On some devices it happens that communication is interrupted. This is manifested in the fact that the connection made by the LTE modem indicates that packets are sent but there are no returnable packets.
Below I presented such a situation (server is pinged with a package size of 1024)
And on the router the situation looks like this:
Disabling the LTE interface
Enabling the LTE interface - the interface disappears from the list
- interface appearance
- restoring communication on the router after restarting the modem
- modem version
This problem occurs for the software version 2.160.000_V008 and 2.160.000_v010.
For software version 2.160.000_v011, the LTE passthrough mode is bordering on a miracle.
As for me, this problem lies in the modem firmware. No return packets from the interface, disappearing interface during the restart indicate a problem in the modem. I suspect that some part of the software hangs.
Dear Mikrotik! Please, repair the LTE modem. I plan to implement new sets and breaking up communication is very troublesome.
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