LCP terminated by peer, X750V2, Visible LTE

Routers
1

I've got an X750v2, using a Visible SIM card. The SIM works great when in a 4G phone, hotspot works fine 24/7. I have cloned the IMEI into my x750. It works, but I get fairly frequent "LCP terminated by peer" in my logs, and the cellular connection drops and gets reconnected after a minute or so. The cellular settings that I've managed to get working (other than these disconnects) are:

cellular protocol: 3g
port: /dev/ttyUSB3
APN: VZWINTERNET
TTL: 88
TTL IPv6: 88
Authentication: PAP/CHAP (no username or password entered, also works without this auth method)

I'm using the latest firmware (as of 5/6/2025) - v4.0 - 0325release1.

Any suggestions regarding how to avoid the "LCP terminated by peer" disconnects? Best I can tell that's the ISP disconnecting from their end. Is it something that might be resolved by getting an X3000 instead of the older X750V2?

Thanks for any help.

2

I used a Visible sim in my X3000 during the summer of 2024 and did not notice any disconnects. I used the same APN as you but did not specify the cellular protocol and as such saw a mix of 4G LTE and 5G NSA connections. I was using a TTL of 65.

3

re: doczenith1 - Thanks. That's at least one piece of evidence that maybe an X3000 would solve this problem.

4

I think I have somewhat resolved this issue. I updated the modem firmware for the EC25 cellular modem. It had a very old version, and that apparently doesn't update when updating the router firmware. It had version 01.001.01.001. I upgraded to version 01.003.01.003. The LCP disconnects seem to be almost completely gone. Maybe this will help someone in the future that has a similar problem.