[SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

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undertowzen
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by undertowzen » Sat Oct 17, 2020 1:39 am

chuckkemp wrote:
Fri Oct 16, 2020 4:02 pm
Click on "Status" under the General Tab. You'll then get a report and under IPV4, will tell you how long you've been receiving internet and if you look above under "System" you can find out how long since your router restarted. From what I've seen the last two firmware updates just stopped the router from letting the internet freeze and once it detects that it restarts the IPV4 service precluding the need to either log in and perform a reboot or just powering down/up to restart the router. Their new method is faster than a reboot and will suffice for me until they can get a real fix, but from what I'm reading this issue isn't jut with MoFi and seems to be ATT centered.
By enabling SQM with the settings mentioned against eth1 (this is the modem module) this is just allowing the fastest speed to be transferred out of the mofi, it’s not required for the disconnect fix but you likely won’t achieve the fastest speed without it.

On other routers I only enable SQM when I’m connected to a gateway or another router through the wan port. When this occurs I enable SQM against the wan port, cake, set the up/down rate to 95-100% theoretical speed, link overhead to Ethernet with a byte rate of 22.

When cascading routers through lan I’ve not yet tried using sqm but I know it’s possible by isolating the lan port used as the wan port into its own vlan and the targeting that for the adapter.

undertowzen
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by undertowzen » Sat Oct 17, 2020 1:45 am

patchesj wrote:
Fri Oct 16, 2020 12:16 pm
Thanks for the info.. I'm not exceptionally familiar with cake. Does it take into account clients on the LAN side behind NAT? In my case I have pfsense running between my mofi and my clients, so typical L3 based qos mechanisms assume everything is coming from one client. There are options for next hop, etc. but I really haven't found a good qos plan for implementing at the mofi level in this design. I just stick with what I have available on pfsense (wish it actually did cake vs codel..)
Sorry I quoted the wrong message I’m on mobile right now oops, see above.

DWRIGHTKM
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by DWRIGHTKM » Sat Oct 17, 2020 8:06 am

chuckkemp wrote:
Fri Oct 16, 2020 4:02 pm
Click on "Status" under the General Tab. You'll then get a report and under IPV4, will tell you how long you've been receiving internet and if you look above under "System" you can find out how long since your router restarted. From what I've seen the last two firmware updates just stopped the router from letting the internet freeze and once it detects that it restarts the IPV4 service precluding the need to either log in and perform a reboot or just powering down/up to restart the router. Their new method is faster than a reboot and will suffice for me until they can get a real fix, but from what I'm reading this issue isn't jut with MoFi and seems to be ATT centered.
Thanks Chuck!

I just checked mine and it says "Connected: 3d 14h 23m 32s". Could just be luck, but this all stopped for me the same day i switched bands..


With this new "reboot method fix" they use. Will it show on the Connected time if and went the connection drops?

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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by afroken3130 » Sun Oct 18, 2020 8:34 pm

DWRIGHTKM wrote:
Sat Oct 17, 2020 8:06 am
Thanks Chuck!

I just checked mine and it says "Connected: 3d 14h 23m 32s". Could just be luck, but this all stopped for me the same day i switched bands..


With this new "reboot method fix" they use. Will it show on the Connected time if and went the connection drops?
Yes. Mine just went out and the connection time reset.

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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by chuckkemp » Wed Oct 21, 2020 4:43 pm

undertowzen wrote:
Fri Oct 16, 2020 12:11 am
Hey all - I just came across this message board and this post today researching something and figured I'd register and reply.

I solved this issue on my router finally a few month ago and it was an issue of buffer bloat and overload due to MTU settings. By default the MTU setting on the router is set to 1500 and this is incorrect for the router and modem. I also set enable SQM with no speed Up/Down link shaping and this helps to increase my upload and download speed.

Update: Just after sending the message below I see that there is a new firmware release 4.3 on the MoFi website.... I will load that and report the results...

I checked and my MTU was already set at 1430 and the "Auto Find Best MTU" checkbox was checked. Apparently MoFi enabled this in one of the two last firmware updates. I haven't made the SQM changes as of yet as speed wasn't an issue though I noticed it isn't as fast as it was prior to this issue starting a few months ago. Having the MTU setting hasn't fixed the issue of the IPV4 needing resetting every 2.0 to 2.5 hours. At least MoFi now detects this and does an auto reset which is better than having to do a manual reboot or unplug/replug reset. While workable its still a PITA as the internet goes down usually right in the middle of something as simple as this reply...

I missed the MTU update on the General setting it was at 1400 and I changed using the custom setting to 1430, did this along with uploading the 4.3 firmware. Will see where this gets me.
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baldwine
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by baldwine » Sat Oct 24, 2020 10:24 pm

Hey, I have been following this thread for a few days because I have been running into the same issue of unplanned disconnections at odds times. With the help of my pi-hole setup on the network, I was able to identify when the network resets occur, but the only constant I could identify was the time frame, specifically on the hour. My connection usually uses Band 2 most of the time with Band 5 as the carrier aggregation. I have replaced antennas and cables along with using various firmware downgrades down to 4.1.5.

I have done all the recommendations offered in this thread with no changes to the outcome. I decided to use the advanced bandlock and removed band 2 from use. I am currently using bands 4 and 5 with firmware 4.3.0 and I have not had a connection issue in 2 days.

I hope this helps someone.

undertowzen
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by undertowzen » Sat Oct 24, 2020 10:27 pm

Make sure to uncheck autofind best mtu as this may vary depending on network congestion moment to moment and change on its own but good to know they are trying to do something to help. I still need to reboot my modem once a day to keep things healthy else within 24-36 hours things can slow down or start breaking but setting the mtu correctly has solved my issues with connections dropping randomly throughout the day, this drop by the way always coincided with someone downloading a file or momentarily taking up 100% of the bandwidth. I guess this may not solve it for everyone. I’m replacing the mofi this week with an enclosure for the pcie modem to convert to usb 3 and just gonna connect to a router running Merlin WRT or Golden Orb firmware, this will solve reliability issue I’m hoping and also will allow for the full 300mbit speed from the modem since the mofi is limited to 100mbit Ethernet.

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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by serverside » Sun Oct 25, 2020 10:25 am

jcrm2 wrote:
Fri Aug 07, 2020 3:53 am
I've had my data connection timed out on my M1 after a few hours but using a VPN does solves the problem. I'm using ExpressVPN through a L2TP connection instead of OpenVPN. OpenVPN kills my data speeds by half when using on a router. L2TP maintains my original speeds. AT&T seems to be killing connections on port 443 and 80. This may be there way of trying too discourage ppl off the iPad and Car Connect post paid plans that are using them in hotspots. I also went the extra mile by changing the imei # on the M1 to the iPad they have on file on my account. Setting the TTL to 65 on your devices/router doesn't do anything so don't waste your time going that route. Just use a VPN that doesn't directly connect to port 443 and 80. Problem solved!
Did you set this up on mofi or rooter? Looking to try the l2tp on rooter, since I'm in the same boat, openvpn murders my connection via PIA

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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by ylrkdr » Mon Oct 26, 2020 11:39 am

If I replace the port 80 and 443 values with other working ports(if there are any), will that stop the interrupts? Or am I barking up the wrong tree?
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Re: [SOLVED!] Losing constant Internet connection on Mofi 4500 (and my mind)

Post by acnebs » Mon Oct 26, 2020 2:58 pm

I've been having the same problem with **MOFI4500-4GXELTE-V2-SIM4** running on Ubifi (AT&T). Can confirm that the primary issue seems to step from AT&T either outright blocking or someone messing up connections on certain protocols/ports. e.g. Mostly it seems to be blocking TCP on port 443 (not port 80, as I am usually still able to go to guaranteed HTTP places like http://captive.apple.com or http://neverssl.com). Also interesting is that I can usually still access Google. Not sure if this is because they're using some newer protocol or what but its true. At first I thought the issue was just a DNS one, as the Mofi seems to default to using Google's DNS servers (`8.8.8.8` and `8.8.4.4`), but I tried switching to Cloudflare's (`1.1.1.1` and `1.0.0.1`) and though that seemed to help in the beginning, in the end I'm not sure it actually worked.

As with others, rebooting almost always fixes the primary issue, as does connecting via VPN (presumably because that happens over UDP).

My issue has been compounded by the fact that I have a weird issue with my MOFI and an Access Point I have (Netgear), where if my Netgear is plugged in via ethernet to my Mofi when the Mofi is trying to boot up (after I reboot to fix), the Mofi is unable to boot properly and the wifi from the Mofi has issues (devices that try to connect to the Mofi's wifi network don't get assigned an IP via DHCP and using a static IP to connect doesn't work either). What's really weird is that the wifi on the Netgear will work just fine. i.e. I reboot the Mofi with the AP plugged in, wifi on AP works to connect to internet after Mofi's reboot, wifi from Mofi does not. In order to get Mofi wifi working again, I need to turn off AP, reboot Mofi, plug AP back in once reboot has completed. Note that this whole time the AP is getting DHCP addresses for the devices that connect to it from the Mofi (e.g. its a bridge).

Back to the apparent AT&T issue, something else I've noticed is that when this throttling/port blocing/whatever thing starts to happen, the ping times from my *devices to the router* get crazy high. Like 500-2000ms (and even timeouts) just to `ping 192.168.10.1` on my LAN from one of my devices. But this is (again, and probably not a concidence!) **only when I'm on the Mofi's wifi network**. If the device is on the Netgear AP's network, ping times to the Mofi (via the AP) remain stable throughout the disruption (1-10ms). On both networks, however, the port blocking or whatever happens the same. Not sure why the AT&T thing would trigger high ping between device and router, but that is what seems to be happening, so *shrug*.

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