Today my port sim port stopped working simply by changing SIM card.

I have a LtAP LTE kit and I can't believe that the SIM port deads. Now with coronavirus is impossible to buy another device or repair with the reseller. Modems are with the last firmware. I have as LTE1 a R11e-LTE and as LTE2 a R11e-LTE-US. Both modems tested on a RBM33G and works all perfect, but with LtAP the main sim is not detected. Very bad quality of SIM ports on this expensive unit. The SIM card was inserted carefully and seeing the right position.

I not know what can I do. I'm very very disappointed.



Regards.

Update:

I found this command: /system routerboard modem set sim-slot=2

I changed sim-slot=2 to sim-slot=3 and now the third SIM port RECOGNIZES a SIM inserted.

Source: https://help.mikrotik.com/docs/display/ ... t+inserted

Thanks for this tip. Probably this can works for me. Tomorrow I will to test it.

Regards.

Update:

I re installed LtAP and both SIM are recognized, but only one is running (The main SIM).







Edit: After a reboot. LTE2 keeps running but LTE1 no, with same effect on IP addresses. Then, I disabled LTE2, reboot, LTE1 again runs, then enable LTE2 and finally keeps running also. It's too weird this for me. Someone knowns what happens?



The actual MTU changes between 1499 and 1500. With 1500 it runs, but I not know how to force MTU to 1500. If I set it to interface anyway it keeps on 1499 the mayor of the time.

Regards.

That INVALID IP should be REMOVE by you and by ROS himself of course too.

Edit: After a reboot. LTE2 keeps running but LTE1 no, with same effect on IP addresses. Then, I disabled LTE2, reboot, LTE1 again runs, then enable LTE2 and finally keeps running also. It's too weird this for me. Someone knowns what happens?

The same behavior I have in old days with two USB Stick modems via PPP-OUT interface and I must disable-enable that bad until he start correctly, after 10x I do reboot who fix situation.
I think that behaviour should be and can be check but we should enable lte logging with change the lte logger ( I have got it but he not be works 100% with lte-us version).
I speak about: Watch LTE parameters: viewtopic.php?f=7&t=153622&hilit=watchdog#p768105

The actual MTU changes between 1499 and 1500. With 1500 it runs, but I not know how to force MTU to 1500. If I set it to interface anyway it keeps on 1499 the mayor of the time.

You could send ping with dont-fragment flag to discover outgoing MTU.
You could check the IP Sniffer at incomming package at lte1 to determine what package income to you.
I do that way and like to setup the outgoing package to receive the same in both dirrections.

PS. Maybe you write to my Telegram ??

Hello SiB:

I can write to you on Telegram, but I send the device to RMA and I changed it for a new unit. I'm waiting to get it. For now I'm surviving with my old RBM33G. I can see that the problem with the invalid IP also occurs with it on same ROS version. I suppose that it is another problem and I need to create a new that be specify for this topic.

If I see the same problem with the new unit (That I believe that yes) I'm going to write you.

As observation: I can see that anytime that a LTE interface is connected to the cell tower, but it not runs is because an invalid dynamic IP is generated. Is my case I see that anytime that the "Actual MTU" is 1499 and not 1500 this occurs.

Thanks and regards.

If I see the same problem with the new unit (That I believe that yes) I'm going to write you.

Enable lte logs:
system logging add topics=lte

Enable lte Logger logs:
Watch LTE parameters: viewtopic.php?f=7&t=153622&hilit=watchdog#p768105

As observation: I can see that anytime that a LTE interface is connected to the cell tower, but it not runs is because an invalid dynamic IP is generated.

You can add a scheduler who will be check if any invalid exist and remove them as workaround but you should grab supout.rif and send it to support@mikrotik.com

Is my case I see that anytime that the "Actual MTU" is 1499 and not 1500 this occurs.

I not use that parameter who is always 1480 at r11e-lte6, I regulate a MTU outgoing via Mangle rules base at outgoing testing and real incomming package size from ipsniffer..

Ok, today I'm going to get the new unit. Some questions:

1. The ping with non-fragment option I do it on the Mikrotik's console to any public IP?

2. The packet sniffer that you say is the Torch of LTE interface?

3. On second post you say that check some LTE parameters. Which?

4. I not know how to gerenate support.rif file to send to Mikrotik, but I'm going to find it.

5. How to control MTU using mangle?

Thanks and regards.

1. The ping with non-fragment option I do it on the Mikrotik's console to any public IP?

Long article I must create.... all that stuff are many times at forum of course.
viewtopic.php?t=130501#p640872
.

2. The packet sniffer that you say is the Torch of LTE interface?

The online tool http://www.letmecheck.it/mtu-test.php show me my mtu is 1500 what is fake becasue I see all package incomming to lte1 are fragmented to smaller.
I use remotely pc and ping's to my PublicIP with differ size to discover that all >1361 are fragments.
Greate help is a WinBox > New Terminal > do it bigger or maximalize and type and watch Size column
tool sniffer quick interface=lte1 direction=rx ip-protocol=1
Remember that 20 is tcp size + 8 icmp=ping => 28B difference
.

5. How to control MTU using mangle?

viewtopic.php?t=130501#p640896
or with your size for all bigger>=1361 change to 1360.
/ip firewall mangle add action=change-mss chain=forward new-mss=1360 out-interface=ether1-SXTR passthrough=yes protocol=tcp tcp-flags=syn tcp-mss=1361-65535
.

3. On second post you say that check some LTE parameters. Which?

In this post at end of it you see the code of script to monitor changes of lte: viewtopic.php?f=7&t=153622&hilit=watchdog#p768105
.

4. I not know how to gerenate support.rif file to send to Mikrotik, but I'm going to find it.

In WinBox, left site you have buttons, 4th from below is "Make supout.rif"
In WinBox, left site you have buttons, Files and you can see that file, button Copy and in your PC do paste or ctrl-v, or drag-and-drop file.
or use google
.
I hope this helps

Thanks for response. I'm going to try it.

About SIM slots, now ALL are working. Changing the unit solved the problem.

About the running of LTE-US interface, keeps without running (As I thought).

Edit:

I connected to a remote computer on other network. I put MY public address on the page and this is the result:



Sniffer of MikroTik:



Interfaces:



Regards.

Maybe you should first access the icmp in filter\input chain ?
PS. You can write me to Telegram

WorkARound:

Set mtu=1480 for lte1 and lte2.

Create a scheduler who runs every 2m with that code:

I optimize a bit the code.

Advantages:

*Code runs only when is necessary. Now it not runs everytime.
*Fix more faster.
*Only writes 82 sectors since reboot. Before every 2 minutes 2 sectors are written.

Log:



Sectors:



Code:



Thanks a lot for all SiB.

Regards.