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mihaelj
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Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 3:27 pm

Just recently I bought the R11e-LTE6 kit. Before that I used Tplink Archer router but I wanted better bandwidth in my house.
In short, the device establishes LTE connection and I use winbox to open the device's terminal and can ping internet address such as 8.8.8.8. Few successful replies and then the ping command says timeout and I can't reach Internet anymore.
If I reboot the router same thing repeats again: lte connection gets established, ping is working and few seconds later transitions to timeout, while the whole LTE interfaces says Full functionality, has ISP provided IP address and no session drop is registered.
I am using default configuration, the device itself is plugged into local, dumb switch and all testing is done with valid SIM card with sufficient resources. I also called my ISP to confirm that the router is connected so that I can be sure that their side is cooperating as expected.

Few days later I upgraded to latest Rotuer OS and LTE modem firmware versions.

I need help in troubleshooting to come to the source of the problem. Shouldn't the rotuer be able to work just out of the box like most other consumer products? Am I missing something obvious as I am not accustom to the Mikrotik products? Help, please!


Some info (some masked):
[admin@MikroTik LHG] > /interface lte info lte1 once
pin-status: ok
registration-status: registered
functionality: full
manufacturer: "MikroTik"
model: "R11e-LTE6"
revision: R11e-LTE6_V025
current-operator: HT HR
lac: 1200
current-cellid: 64028686
enb-id: 250112
sector-id: 14
phy-cellid: 364
access-technology: LTE (CA2)
session-uptime: 6m24s
imei: --------
imsi: --------------
uicc: ----------
subscriber-number: "----","----",145
primary-band: B20@15Mhz earfcn: 6375 phy-cellid: 364
ca-band: B3@20Mhz earfcn: 1501 phy-cellid: 364
rsrp: -63dBm
rsrq: -8dB
sinr: 12dB
 
mihaelj
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 6:16 pm

It came to my attention that there could be a problem with a LAN cable. 10m of LAN cable was used to connect POE with the device which could be a problem for the device when it is power hungry. I used ubiquity Noanostations devices on 50m+ UTP cables and all were PoE powered and there was no issue with that so I didn't think that this could be a problem.
I brought the router down from the roof and connected it on shorter cable. It works stable for now and I will update how it goes. If it works ok then it could be that the stock provided power adapter/PoE is just too weak for the task. Will see...
 
Cablenut9
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 6:21 pm

V025 is not one but two versions out of date, so upgrade it before you do anything else by doing
/interface lte firmware-upgrade lte1 upgrade=yes
 
mihaelj
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 6:43 pm

Nope, it is still behaving the same it just took it a bit longer to fail.

Latest info:
pin-status: ok
registration-status: registered
functionality: full
manufacturer: "MikroTik"
model: "R11e-LTE6"
revision: R11e-LTE6_V027
current-operator: 21901
lac: 1200
current-cellid: 64028686
enb-id: 250112
sector-id: 14
phy-cellid: 364
access-technology: Evolved 3G (LTE)
session-uptime: 33m25s
...

[admin@MikroTik] > ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 ADS 0.0.0.0/0 lte1 2
1 ADC 10.135.0.96/32 10.135.0.96 lte1 0
2 ADC 192.168.2.0/24 192.168.2.188 ether1 0


It shows that the session is up (session-uptime: 33m25s), but still no ping getting out on the internet:
[admin@MikroTik] > ping 8.8.8.8
SEQ HOST SIZE TTL TIME STATUS
0 8.8.8.8 timeout
1 8.8.8.8 timeout
...
 
mihaelj
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 6:44 pm

V025 is not one but two versions out of date, so upgrade it before you do anything else by doing
/interface lte firmware-upgrade lte1 upgrade=yes
Sorry, I pasted outdated info. It is @ v27.
 
mihaelj
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 6:49 pm

If I disable and enable LTE interface to get it to reconnect freshly, ping starts working ok but fails within a minutes.
The following commands were executed in sequence just to demonstrate how it fails suddenly without touching any other options on the router. Just working in its terminal window:

112 8.8.8.8 56 114 46ms
113 8.8.8.8 56 114 46ms
114 8.8.8.8 56 114 55ms
115 8.8.8.8 56 114 47ms
116 8.8.8.8 56 114 55ms
117 8.8.8.8 56 114 55ms
sent=118 received=81 packet-loss=31% min-rtt=33ms avg-rtt=45ms max-rtt=63ms

[admin@MikroTik] > ping 8.8.8.8
SEQ HOST SIZE TTL TIME STATUS
0 8.8.8.8 56 114 60ms
1 8.8.8.8 56 114 55ms
2 8.8.8.8 56 114 56ms
3 8.8.8.8 56 114 48ms
4 8.8.8.8 56 114 46ms
5 8.8.8.8 56 114 48ms
6 8.8.8.8 56 114 46ms
7 8.8.8.8 56 114 46ms
8 8.8.8.8 56 114 45ms
9 8.8.8.8 56 114 47ms
sent=10 received=10 packet-loss=0% min-rtt=45ms avg-rtt=49ms max-rtt=60ms

[admin@MikroTik] > /tool traceroute 8.8.8.8
# ADDRESS LOSS SENT LAST AVG BEST WORST STD-DEV STATUS
1 100% 1 timeout
2 100% 1 timeout
3 0% 1 0ms

[admin@MikroTik] > ping 8.8.8.8
SEQ HOST SIZE TTL TIME STATUS
0 8.8.8.8 timeout
1 8.8.8.8 timeout
2 8.8.8.8 timeout
sent=3 received=0 packet-loss=100%


If I ruin torch on lte1 interface while running ping it appears as if something is flowing to lte1 but not coming back? (I don't understand the tool yet):
[admin@MikroTik] > /tool torch
interface: lte1
TX RX TX-PACKETS RX-PACKETS
560bps 0bps 1 0
560bps 0bps 1 0
 
Cablenut9
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Re: Need help troubleshooting R11e-LTE6_V025

Tue Apr 20, 2021 7:09 pm

Also try enabling or disabling "allow roaming" as messing with this has gotten me out of similar "can't connect" situations.
 
mihaelj
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Re: Need help troubleshooting R11e-LTE6_V025

Wed Apr 21, 2021 9:38 am

I applied lte modem commands from the post below:
viewtopic.php?t=154865#p765629

and it works much better now. No connection dropping so far.

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