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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...
There is no fix. I spent wasted a considerable amount of time any money purchasing a Verizon plan going over all the forums and help. I ended up returning the unit and canceling my hotspot plan.
I just bought the LM1200 for use as a hotspot with Visible, which runs on Verizon. It connected successfully with a single computer using ethernet in router mode. Bridge mode won't connect at all, with or without anything connected to the modem. While not ideal, I'd be satisfied with router mode which, I understand, adds yet another NAT layer.
I read the first page of this topic, then jumped to the last. Without reading all intervening pages, is it possible to use this modem with a GL-iNet GL-AR750S-Ext (Slate) travel router using the TTL mangle workaround? I do that successfully tethering the travel router to a phone by USB, so I know the workaround works, in general. Does it not work with this device?
Edit to my above comment. I have now read through the entire thread. If I understand correctly, the LM1200 will remain connected in router mode with IPv6 disabled and TTL set to 64 on a router connected to it. I'll try to connect my travel router which I've used successfully tethered to a phone by USB.
- Does your router support disabling IPv6 and setting TTL to 64 @ the CLI or menu for the WAN link? Not many consumer grade routers do unless you find one with a custom firmware. Please let us know the outcome after you have tested. I’m not sure if more than one person had success with this or not.
The LM1200 is connected to VSBLINTERNET APN in router mode. APN setup was IPV4/6 and worked, but I changed it to IPV4 based on comments read here. After reboot, it reconnected. Since it was working on IPV4/6, is there any reason to not to enable 6?
I connected the WAN port of the GL-AR750S-Ext (GL-iNet Slate travel router) to the LAN port of the LM1200 and connected my laptop to the Slate by WiFi. Speedtest on the laptop shows ping and DL results similar to what I get from a phone connected directly to Visible.
The Slate router runs on DD-WRT, uses Luci as a user interface and supports custom firewall rules. I thought I had mangled TTL to 64 but there is no custom rule to that effect. I guess I had factory reset the modem sometime in the past and not restored it. That said, it seems to work but I haven't been connected long and have no means of monitoring the connection (that I know of).
My career was in hospital software so I'm generally tech proficient but have no Linux and not much network experience beyond configuring gateways, ip addresses and DNS. I've run DD-WRT on home routers for years but had little need to use custom rules. I can follow instructions, though, if doing so can provide useful information.
Is there a way I can monitor the connection to determine if it's dropping? Since the Slate router runs DD-WRT, perhaps there are some logs I can use to track connectivity, if that's of any value. If so, I'll need instructions.
Also: Duh, having only skimmed the specs I didn't realize the LM1200 didn't have WiFi, so I can't omit the travel router, anyway. For me, the LM1200 isn't a failover device - it's my primary hotspot while camping in remote locations. I plan to connect a Waveform MIMO panel antenna to optimize reception. I know it won't work where there is none.
Addendum: This probably isn't new information to others but, after successfully connecting the Slate travel router to the LM1200 in router mode, I switched to bridged mode. The LM1200 then failed to connect to Visible. I had to connect the laptop directly to the LM1200 to access the admin panel. Switching back to router mode restored connectivity. I'm connected through it as I type this.
"... Since the Slate router runs DD-WRT, ..."
Error correction: The GL-iNet travel router runs OpenWRT, not DD-WRT.
It's not an important point but my past experience is with DD-WRT, not OpenWRT.
JohnPeng Can the LM1200 firmware be revised to permit bridged connection when the WAN port is connected, but switch to router mode when the WAN fails? That will allow use as a failover device where the WAN source allows bridging but the LTE source (Verizon) does not. I'd rather be bridged but, barring other options, router mode is acceptable.
- Hello! So I just got the LM1200 today. I got it set plugged in and it is doing the exact same thing mentioned in the thread. If the WAN connection is connected to my Netgear cable modem, things work fine. If I disconnect the modem to test the cell connection, it starts the endless cycle of up and down. I have the newest Netgear cable modem, and a RAX80 router. I am using Cox cable for hardwired and Verizon for cell. Anyone been able to fix this issue? Any help would be greatly appreciated.
- Just save yourself the trouble and return it now.
- Verizon does not permit connection in bridged mode.
The modem cannot connect in bridged mode while the WAN power is active, then switch to router mode when it falls back to the mobile network. Apparently, if you need Verizon (or Visible) the only choice is to use the modem in router mode.
While not ideal, that's acceptable to me. My primary use of the modem is for Internet access while traveling. My brief experience is that it stays connected at a decent speed when in router mode. - I’m going to see if this unit works any differently.
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