LTE Link issues with new KNOT LTE Device

RouterOS General
1

HI I just bought a new KNOT Embedded LTE Device as a replacement of the existing hAP ax lite LTE6

the setup is the same and I am using the latest ROS and the modem firmware

However on the new KNOT Embedded LTE I get this error every several hours:

Messages

memory interface, info lte1 link down
memory lte, error lte1 qmi: dropped reply

lte1 forced reconfiguration due to difficulty setting link up

the setup is the same, the ROS ver is the same, the SIm is the same and location is the same:

these are the logs i got as well

image
image2064×610 171 KB

has anyone encountered the same error?

thank you

2

the issue has been resolved and was related to the Zero Tier service being enabled on the WAN2 interface of the primary router, the KNOT LTE is a LTE backup router and was connected to WAN2 port of the primary router (non mikrotik).

The primary router had zero tier service enabled on the WAN2 port and looked like zero tier was trying to establish connection to the “cg-nat“ range of the LTE internal isp subnet 10.45.32.120 which the ISP probably recognised as invalid or suspicion traffic and cut the connection off.

3

That makes sense. Although my first reading was it likely a bug, since KNOT LTE is new.

Verizon in US does drop the connection if it gets any packet that does not match the expected src-address – so this stuff happens. And, ZeroTier probing might try it's own address to get out, and ZL1 is somewhat indifferent to the firewall NAT, so it make it to LTE.

Good catch.

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