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Forum Discussion
LM1200 repeatedly dropping link
I recently purchased an LM1200-100NAS to serve as an LTE failover connection for my homelab and noticed a strange issue while setting up my pfSense-based router to use the LM1200 as a secondary WAN c...
Verizon
I put the LM1200LTE into router mode for the past week or so and it seems to have resolved itself (few short term instances vs. near constant and continuous cycling of the network / cell connector). However, I don't know if the underlying issue is the mode setting firmware (bridge vs. router) or the fact that "router" mode seems to force the parties to use IPv4... I suspect that IPv6 isn't playing nice between Verizon, the modem, and various downstream devices.
There are manual settings for IPv4 and IPv6 within the "Mobile" tab, but I was not able to solve or replicate the issues with those settings, nor was I confident that they were actually being applied correctly given what I was seeing elsewhere (IPv6 addresses were still being referenced and issued).
Others have commented on LTE dropout or LTE / WCDMA tower switching as a potential cause; I tested this in areas with clear LTE dropout issues and switching did not appear to correlate to the network cycling issues. However, these tests did not rule out an IPv6 issue with specific towers or connection types.
I'm also experiencing this issue on Verizon when using bridge mode, directly connected to a laptop through USB-C to ethernet converter. The issue goes way when I put the LM1200 in router mode.