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

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

Post by jmatthew » Sat Jun 20, 2020 4:25 pm

(UPDATE 8/4/2020: Scroll to the end of this post for my workaround.)

Hi all,

First a huge thank you to everyone who participates in these forums. You've all been incredibly helpful as I've figured out how to get a good LTE router setup up and running out in the sticks. But now I've got a problem that is not-so-slowly driving me insane.

About 2.5 months ago (at the beginning of quarantine), I started using a Mofi 4500 (SIM4 COMBO) with AT&T service. Out of the box, performance was excellent -- I was consistently getting 40-70 down, and 15-30 up. That certainly exceeded my expectations given the lack of other options where we are in upstate New York. For about two months, everything was rock solid. No difficulty delivering what we need for two people working from home, plus a handful of smart devices and some occasional HD TV streaming. I was thrilled.

Then about three weeks ago, we started losing Internet access out of the blue throughout the day, requiring a reset of the Mofi router. We'd unplug the Mofi and plug it back it, it would initialize, and everything would work great. Until it inevitably dies again, usually anywhere from 45 mins to a couple hours later. So we have been constantly resetting the router throughout the day, and the randomness of it is wreaking havoc on our work lives.

Some unusual (to me anyway!) notes about the behavior when service goes down:
  • The indicator light for an internet connection on the Mofi stays green even when we lose service.
  • While all of our web browsing dies at the same time on various connected devices, if either of us is in a video call (usually using Google Meet or Zoom), somehow that person can generally continue on with the call for a considerable amount of time, sometimes another 30 mins, even as we can't do anything else. (And even the person successfully still on the video call can't do anything else on their device.)
  • When I log in to the Mofi control panel once things have gone down, and try to do the "Internet connection test" from the main screen it does indeed fail. However, when I go to System>>Diagnostics, and do things like run a ping test to openwrt.org or do a traceroute, they work and return live results.
My setup and what I've tried so far:
  • The router is a MOFI4500 4GXeLTE SIM4COMBO, using AT&T service. Signal strength is usually 4 or 5 bars.
  • Current Mofi firmware is 4.1.8-std, which was just released a week or two ago I believe. I was having the same problems with the prior firmware; I did the Remote Update through the control panel to update to this latest firmware a few days ago hoping it would improve things. No change, same problems all around.
  • Bandlock is on Band 12, on advice of Mofi (see below). Or at least I think it is, there is a quirk in the control panel I can't explain. When I go to the Mofi "Modem Status" page, it says
    Current Band: B2
    Module has NO Bandlock filter in place
    Bandlock set to the following: LTE_B12
    Advanced Bandlock: No Advanced Bandlock

    I did indeed follow the instructions to lock to Band 12, but I can't tell if it's really locked or not. Or if this has anything to do with my issue or not.
  • Internal modem module is Sierra MC7455
  • Our normal setup is to connect all devices to a Netgear Orbi mesh system, which is then physically plugged into the Mofi router. However, even taking the Orbi completely out of the equation and connecting all devices wirelessly to the Mofi, we have the exact same issue.
  • I replaced the AT&T SIM card, and also had the data provider completely delete my account and assign me a new one, just to see if it would help anything at all. No change, still have the same problems.

Mofi support was great when I was asking questions before I bought the router, but it has been rather frustrating as I try to troubleshoot this. They've been very slow to respond, and don't have much to say. The only piece of advice they gave me so far was to do a bandlock, which I did (band 12 had the best signal so that's what I chose) and it didn't help.

Does anyone have any ideas on other things I can try? I'm getting rather desperate here, and it is seriously impacting our ability to work and also just generally driving me crazy. Based on the behavior, I'm convinced the issue is within the Mofi somewhere rather than the AT&T service, but I'm certainly open to trying anything and everything.

Help! I will happily wing a nice bottle of booze your way. Or one of my organs. It has come to that.

Thanks everyone,

J

UPDATE 8/4/2020 -- HOW I "FIXED" IT

Since I started this thread, I figured I should post in one tidy spot how I fixed (or rather "fixed") this problem.

I tried many things, including:
-- Three different AT&T network providers and plans, using multiple APNs
-- Tried Verizon and T-Mobile network plans, and had no problems, confirming the issue was AT&T (but signal strength wasn't strong enough on those to stick with them)
-- Another Mofi router, and another non-Mofi router. Many threads on Reddit, LTEHacks.com and the LTE Hacks facebook group make clear this issue has nothing to do with Mofi, and people are having it with AT&T on many devices.
-- A half dozen different configurations/firmware installs on the Mofi

In the end, going through a VPN saved us. Once we installed VPN software on our primary devices (we used NordVPN, more on them in a moment), everything just worked. No more lost Internet connections, ever. And even though the VPN software was only installed on our connected computers, phones and tablets, the many other devices on the network that weren't going through the VPN -- Apple TV, a zillion smart home devices, more -- continued to hum along just fine, without ever triggering the need to reset the Mofi router.

My best guess is that at some point, some sort of traffic/device limit was being triggered with AT&T and it was disabling HTTP traffic. But I really don't know, and for now, I really don't care. Everything finally works great.

NordVPN (www.nordvpn.com) was incredibly easy to set up, and they seem to offer great deals (in the end, paid about $80 for three years). That allows for six simultaneous connected devices. Though again, we only put the VPN on our heavy-use devices, like our laptops and iPads. Technically, you can install NordVPN (or other VPNs) at the router level, and the Mofi 4500 makes this incredibly easy to do with built-in setup for NordVPN. But there was a huge performance hit doing it that way, as the Mofi just isn't strong enough to process the VPN encryption. Enabling the VPN on Mofi dropped our speeds by about 80%. Enabling it on the device level we see truly NO drop in speed.

I did briefly buy a souped up ASUS router from FlashRouters (www.flashrouters.com), with a massive processor and built-in custom firmware for various VPNs, including Nord. It worked great, and speeds were much faster, but in the end I found the router unwieldy and couldn't get it to play as nicely with our Orbi wifi. I ended up returning it. The people at FlashRouters were fantastic and I would highly recommend them. If you install the VPN at the router level, obviously everything is much simpler in terms of connected devices -- and that only counts as one device.

We've only run into two quirks with using the VPN: Some web sites (including Google every once in awhile) will occasionally force you to do one of those I-am-not-a-robot captchas, as the VPN traffic triggers something or other on their end. And, more frustrating, Bank of America's website and mobile app cannot be accessed through NordVPN. This is a known issue, apparently BofA blocks a lot of VPN traffic. So when we log into banking we do have to temporarily disable the VPN on the device we're using, which again the Nord software makes super easy.

The final point I'd mention is that if you go down the Reddit rabbit hole on NordVPN you'll see that they had some sort of compromising issue in the not-too-distant-past, and some people who are using VPNs for hyper anonymity don't like them for that reason. But (a) Nord claims they've fixed all that and (b) I'm just using it to get my Internet to work, not launder drug cartel money.

So, there you go. Not so much a fix as a workaround, but it really does work, and now we're back humming along with fast speeds and no router resets at all. Good luck.

J

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by Didneywhorl » Sat Jun 20, 2020 11:08 pm

Hey there. Quick question. What plan are you using for the ATT? Can you put the SIM into another device, like a phone or ipad and see if it works ok like that?

Also, I'm guessing not, but, do you know how to run AT commands on the mofi user interface?
It'd be super nice if I could get the output from a command called
AT!GSTATUS?
from your modem.

The output looks like:
at
OK
at!gstatus?
!GSTATUS:
Current Time: 483762 Temperature: 45
Reset Counter: 2 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B12 LTE bw: 5 MHz
LTE Rx chan: 5035 LTE Tx chan: 23035
LTE CA state: ACTIVE LTE Scell band:B2
LTE Scell bw:15 MHz LTE Scell chan:1125
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC RxM RSSI: -82 RSRP (dBm): -110
PCC RxD RSSI: -80 RSRP (dBm): -107
SCC RxM RSSI: -94 RSRP (dBm): -129
SCC RxD RSSI: -94 RSRP (dBm): -128
Tx Power: 23 TAC: A6FF (42751)
RSRQ (dB): -12.9 Cell ID: 006F9F15 (7315221)
SINR (dB): 6.8
The best way I know of is to SSH in with a free program called putty.

Let me know if you want more directions. Check here for a posting that has some help for how to get that output:viewtopic.php?t=263

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by Didneywhorl » Sat Jun 20, 2020 11:09 pm

The reason I'd like to see that output, is it may show your issue, it may not.

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by jmatthew » Sun Jun 21, 2020 8:52 am

Thanks for taking a look!

I'm on an AT&T unlimited hotspot plan through one of the ebay resellers. It's someone who has a ton of active positive feedback, so I don't think I'm on a dodgy plan that isn't delivering as advertised. That said, switching data providers is one thing I haven't tried yet.

And yes, can run AT commands from the Mofi interface. Mofi also has a one-click report that runs GSTATUS plus some others, so I'm dumping the whole thing here in case useful:


0:[AT!GSTATUS?]
1:[!GSTATUS:]
2:[Current Time: 58646 Temperature: 52]
3:[Reset Counter: 3 Mode: ONLINE]
4:[System mode: LTE PS state: Attached]
5:[LTE band: B12 LTE bw: 10 MHz]
6:[LTE Rx chan: 5110 LTE Tx chan: 23110]
7:[LTE CA state: NOT ASSIGNED]
8:[EMM state: Registered Normal Service]
9:[RRC state: RRC Connected]
10:[IMS reg state: No Srv]
11:[PCC RxM RSSI: -63 RSRP (dBm): -86]
12:[PCC RxD RSSI: -62 RSRP (dBm): -85]
13:[Tx Power: 12 TAC: 0954 (2388)]
14:[RSRQ (dB): -7.8 Cell ID: 0C5E6B11 (207514385)]
15:[SINR (dB): 14.6]
16:[OK]


0:[ATi3]
1:[Manufacturer: Sierra Wireless, Incorporated]
2:[Model: MC7455]
3:[Revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52]
4:[MEID: xxxx]
5:[IMEI: xxxx]
6:[IMEI SV: 16]
7:[FSN: xxxx]
8:[+GCAP: +CGSM]
9:[OK]


#--------- CARRIER ID START ------------

Carrier ID: 310410

#--------- CARRIERID END ------------

0:[AT+CGDCONT?]
1:[+CGDCONT: 1,"IP","broadband","0.0.0.0",0,0,0,0]
2:[+CGDCONT: 2,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0]
3:[OK]


0:[AT+CSQ]
1:[+CSQ: 27,99]
2:[OK]


0:[AT+rscp?]
1:[+RSCP:]
2:[OK]


0:[AT+ecio?]
1:[+ECIO: NOT IMPLEMENTED]
2:[OK]


0:[AT!GETRAT?]
1:[!GETRAT: NOT IMPLEMENTED]
2:[OK]


0:[AT!getband?]
1:[!GETBAND: B12]
2:[OK]


0:[AT*cnti=1]
1:[*CNTI: 1,LTE]
2:[OK]


0:[AT+COPS=3,0;+COPS?]
1:[+COPS: 0,0,"AT&T",7]
2:[OK]


0:[AT+COPS=3,2; +COPS?]
1:[+COPS: 0,2,"310410",7]
2:[OK]


0:[AT+CREG=2; +CREG?]
1:[+CREG: 2,1,"FFFE","C5E6B11",7]
2:[OK]


LAC:FFFE CELL ID:C5E6B11


0:[AT+CGREG=2; +CGREG?]
1:[+CGREG: 2,1,"FFFE","C5E6B11",7]
2:[OK]


0:[AT+CGATT?]
1:[+CGATT: 1]
2:[OK]


#--------- ROAMING INFO ------------

0:[AT^SYSCONFIG?]
1:[^SYSCONFIG: 2,0,1,2]
2:[OK]


0:[AT^SYSINFO]
1:[^SYSINFO: 2,3,0,9,1]
2:[OK]


#--------- END ROAMING INFO ------------

Pin Lock
0:[AT+CMEE=1;+CPIN?]
1:[+CPIN: READY]
2:[OK]


Network Lock
0:[AT+CLCK="PN",2]
1:[+CLCK: 0]
2:[OK]


#--------- START SIERRA DIAG ------------

0:[ATi3]
1:[Manufacturer: Sierra Wireless, Incorporated]
2:[Model: MC7455]
3:[Revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52]
4:[MEID: xxx]
5:[IMEI: xxxx]
6:[IMEI SV: 16]
7:[FSN: xxx]
8:[+GCAP: +CGSM]
9:[OK]
#---------------------- i3 ---------------
0:[AT!image?]
1:[TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID]
2:[FW 1 GOOD 2 0 0 ?_? 02.30.01.01_?]
3:[FW 2 GOOD 1 0 0 ?_? 02.24.05.06_?]
4:[FW 3 GOOD 1 0 0 ?_? 02.24.03.00_?]
5:[FW 4 EMPTY 0 0 0]
6:[Max FW images: 4]
7:[Active FW image is at slot 1]
8:[TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID]
9:[PRI FF GOOD 0 0 0 002.049_004 02.30.01.01_ATT]
10:[PRI FF GOOD 0 0 0 001.005_000 02.24.05.06_BELL]
11:[PRI FF GOOD 0 0 0 002.045_001 02.30.01.01_GENERIC]
12:[PRI FF GOOD 0 0 0 001.023_000 02.30.01.01_ROGERS]
13:[PRI FF GOOD 0 0 0 001.003_000 02.30.01.01_SIERRA]
14:[PRI FF GOOD 0 0 0 002.045_000 02.30.01.01_SPRINT]
15:[PRI FF GOOD 0 0 0 001.023_000 02.30.01.01_TELUS]
16:[PRI FF GOOD 0 0 0 000.020_000 02.30.01.01_US-Cellular]
17:[PRI FF GOOD 0 0 0 002.052_002 02.30.01.01_VERIZON]
18:[PRI FF GOOD 0 0 0 001.001_000 02.24.03.00_VODAFONE]
19:[Max PRI images: 50]
20:[OK]
#---------------------- !image? ---------------
0:[AT!impref?]
1:[!IMPREF:]
2:[preferred fw version: 02.30.01.01]
3:[preferred carrier name: GENERIC]
4:[preferred config name: GENERIC_002.045_001]
5:[current fw version: 02.30.01.01]
6:[current carrier name: GENERIC]
7:[current config name: GENERIC_002.045_001]
8:[OK]
#---------------------- !impref? ---------------
0:[AT+cgdcont?]
1:[+CGDCONT: 1,"IP","broadband","0.0.0.0",0,0,0,0]
2:[+CGDCONT: 2,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0]
3:[OK]
#---------------------- +cgdcont? ---------------
0:[AT!selrat?]
1:[!SELRAT: 00, Automatic]
2:[OK]
#---------------------- !selrat? ---------------
0:[AT!band?]
1:[Index, Name, GW Band Mask L Band Mask TDS Band Mask]
2:[10, LTE_B12, 0000000000000000 0000000000000800 0000000000000000]
3:[OK]
#---------------------- !band? ---------------
0:[AT+cpin?]
1:[+CPIN: READY]
2:[OK]
#---------------------- +cpin? ---------------
#--------- END SIERRA DIAG ------------

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by jmatthew » Sun Jun 21, 2020 10:30 am

A couple more data points that might be clues:

-- Our connection just died again. However, while we lost the ability to visit any websites, our Sonos system continued to stream a live radio station via TuneIn (and it wasn't cached -- was playing live, and we let the stream go for about 40 mins before we reset the router). Also during this time, my iMac continued to receive iMessages. And that computer is connected only to Wifi. So weird. Http web queries aren't going through, other things are?

And in case it's at all useful, I re-ran the above report on the router while the Internet was down. Here are the results:

0:[AT!GSTATUS?]
1:[!GSTATUS:]
2:[Current Time: 64596 Temperature: 50]
3:[Reset Counter: 3 Mode: ONLINE]
4:[System mode: LTE PS state: Attached]
5:[LTE band: B12 LTE bw: 10 MHz]
6:[LTE Rx chan: 5110 LTE Tx chan: 23110]
7:[LTE CA state: NOT ASSIGNED]
8:[EMM state: Registered Normal Service]
9:[RRC state: RRC Connected]
10:[IMS reg state: No Srv]
11:[PCC RxM RSSI: -67 RSRP (dBm): -86]
12:[PCC RxD RSSI: -67 RSRP (dBm): -85]
13:[Tx Power: 4294967283 TAC: 0954 (2388)]
14:[RSRQ (dB): -7.3 Cell ID: 0C5E6B11 (207514385)]
15:[SINR (dB): 21.2]
16:[OK]


0:[ATi3]
1:[Manufacturer: Sierra Wireless, Incorporated]
2:[Model: MC7455]
3:[Revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52]
4:[MEID: xxx]
5:[IMEI: xxxx]
6:[IMEI SV: 16]
7:[FSN: xxx]
8:[+GCAP: +CGSM]
9:[OK]


#--------- CARRIER ID START ------------

Carrier ID: 310410

#--------- CARRIERID END ------------

0:[AT+CGDCONT?]
1:[+CGDCONT: 1,"IP","broadband","0.0.0.0",0,0,0,0]
2:[+CGDCONT: 2,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0]
3:[OK]


0:[AT+CSQ]
1:[+CSQ: 26,99]
2:[OK]


0:[AT+rscp?]
1:[+RSCP:]
2:[OK]


0:[AT+ecio?]
1:[+ECIO: NOT IMPLEMENTED]
2:[OK]


0:[AT!GETRAT?]
1:[!GETRAT: NOT IMPLEMENTED]
2:[OK]


0:[AT!getband?]
1:[!GETBAND: B12]
2:[OK]


0:[AT*cnti=1]
1:[*CNTI: 1,LTE]
2:[OK]


0:[AT+COPS=3,0;+COPS?]
1:[+COPS: 0,0,"AT&T",7]
2:[OK]


0:[AT+COPS=3,2; +COPS?]
1:[+COPS: 0,2,"310410",7]
2:[OK]


0:[AT+CREG=2; +CREG?]
1:[+CREG: 2,1,"FFFE","C5E6B11",7]
2:[OK]


LAC:FFFE CELL ID:C5E6B11


0:[AT+CGREG=2; +CGREG?]
1:[+CGREG: 2,1,"FFFE","C5E6B11",7]
2:[OK]


0:[AT+CGATT?]
1:[+CGATT: 1]
2:[OK]


#--------- ROAMING INFO ------------

0:[AT^SYSCONFIG?]
1:[^SYSCONFIG: 2,0,1,2]
2:[OK]


0:[AT^SYSINFO]
1:[^SYSINFO: 2,3,0,9,1]
2:[OK]


#--------- END ROAMING INFO ------------

Pin Lock
0:[AT+CMEE=1;+CPIN?]
1:[+CPIN: READY]
2:[OK]


Network Lock
0:[AT+CLCK="PN",2]
1:[+CLCK: 0]
2:[OK]


#--------- START SIERRA DIAG ------------

0:[ATi3]
1:[Manufacturer: Sierra Wireless, Incorporated]
2:[Model: MC7455]
3:[Revision: SWI9X30C_02.30.01.01 r7792 CARMD-EV-FRMWR2 2018/07/13 02:24:52]
4:[MEID: xxx]
5:[IMEI: xxxx]
6:[IMEI SV: 16]
7:[FSN: xxx]
8:[+GCAP: +CGSM]
9:[OK]
#---------------------- i3 ---------------
0:[AT!image?]
1:[TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID]
2:[FW 1 GOOD 2 0 0 ?_? 02.30.01.01_?]
3:[FW 2 GOOD 1 0 0 ?_? 02.24.05.06_?]
4:[FW 3 GOOD 1 0 0 ?_? 02.24.03.00_?]
5:[FW 4 EMPTY 0 0 0]
6:[Max FW images: 4]
7:[Active FW image is at slot 1]
8:[TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID]
9:[PRI FF GOOD 0 0 0 002.049_004 02.30.01.01_ATT]
10:[PRI FF GOOD 0 0 0 001.005_000 02.24.05.06_BELL]
11:[PRI FF GOOD 0 0 0 002.045_001 02.30.01.01_GENERIC]
12:[PRI FF GOOD 0 0 0 001.023_000 02.30.01.01_ROGERS]
13:[PRI FF GOOD 0 0 0 001.003_000 02.30.01.01_SIERRA]
14:[PRI FF GOOD 0 0 0 002.045_000 02.30.01.01_SPRINT]
15:[PRI FF GOOD 0 0 0 001.023_000 02.30.01.01_TELUS]
16:[PRI FF GOOD 0 0 0 000.020_000 02.30.01.01_US-Cellular]
17:[PRI FF GOOD 0 0 0 002.052_002 02.30.01.01_VERIZON]
18:[PRI FF GOOD 0 0 0 001.001_000 02.24.03.00_VODAFONE]
19:[Max PRI images: 50]
20:[OK]
#---------------------- !image? ---------------
0:[AT!impref?]
1:[!IMPREF:]
2:[preferred fw version: 02.30.01.01]
3:[preferred carrier name: GENERIC]
4:[preferred config name: GENERIC_002.045_001]
5:[current fw version: 02.30.01.01]
6:[current carrier name: GENERIC]
7:[current config name: GENERIC_002.045_001]
8:[OK]
#---------------------- !impref? ---------------
0:[AT+cgdcont?]
1:[+CGDCONT: 1,"IP","broadband","0.0.0.0",0,0,0,0]
2:[+CGDCONT: 2,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0]
3:[OK]
#---------------------- +cgdcont? ---------------
0:[AT!selrat?]
1:[!SELRAT: 00, Automatic]
2:[OK]
#---------------------- !selrat? ---------------
0:[AT!band?]
1:[Index, Name, GW Band Mask L Band Mask TDS Band Mask]
2:[10, LTE_B12, 0000000000000000 0000000000000800 0000000000000000]
3:[OK]
#---------------------- !band? ---------------
0:[AT+cpin?]
1:[+CPIN: READY]
2:[OK]
#---------------------- +cpin? ---------------
#--------- END SIERRA DIAG ------------

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by Didneywhorl » Sun Jun 21, 2020 11:09 am

You posted EXACTLY what is needed. A log before problems AND during the problem. Bravo dude! If everyone did this, we could help more people much quicker.

General network info says your still good on the network.

Do you HAVE to band lock to B12? I would unlock it to see what happens. Your signal strength could improve, maybe some better positioning or bigger antennas. No boosters.

Maybe get a car inverter and drive your unit closer to the tower and see if the problem persists.

If you can, try the SIM in another device.

Your account status seems fine based on your stats.

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by 56387f » Sun Jun 21, 2020 1:56 pm

Hi,

Another owner of MOFI4500 4GXeLTE SIM4COMBO is here.

The fact that you cannot get access to a webserver using HTTP _but at the same time you can use previously initialized TCP/IP connection tells us that most likely there is a problem with DNS (domain name resolution). This is when you can ping a website by its IP address for example "ping 8.8.8.8" but at the same time "ping google.com" does not work because the router cannot resolve the name i.e. to get to know the IP address of the server "google.com" by sending a request to the external DNS server or find the result on the previous DNS query in the local cache.

Anyway, I would suggest the following:
a) if you have a chance try to connect your MOFI to the Internet using WAN port and a different internet provider. By default MOFI comes with failover service enabled and WAN /wired connection has priority over WWAN (the modem), so it will kick in automatically.

1) If everything works just fine then some funky stuff is happening to DNS requests on the tower / mobile provider network;
2) If everything works as before i.e. the problem still exists then the problem is in MOFI software which is the heavily modified version of OpenWrt 14.7;

b) Try to use a different power adapter - a little bit mode powerful one. I noticed that the stock power adapter in certain situations let the voltage lever go quite low (I have somewhere on the forum this situation documented). I mean we want to make sure that MOFI does not suffer from power spikes when it uses the WWAN modem.

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by 56387f » Sun Jun 21, 2020 5:31 pm

jmatthew wrote:
Sat Jun 20, 2020 4:25 pm
  • When I log in to the Mofi control panel once things have gone down, and try to do the "Internet connection test" from the main screen it does indeed fail. However, when I go to System>>Diagnostics, and do things like run a ping test to openwrt.org or do a traceroute, they work and return live results.
Some more ideas:

when the Internet connectivity is lost (your words quoted above confirm the fact that MOFI itself can reach the internet)

please do the following:
a) assuming that we are talking about Windows, open command prompt windows (run cmd.exe command) and execute in that newly opened console window the following command:
ping -n 10000 google.com

It will obviously fail, don't close the window let it stay open you will need it later;

b) I don't know how much you know about SSH/ putty but if it does not ring the bell for you then merely go to MOFI /Basic/System/Webshell - another window should be open and you can get access to MOFI OpenWrt command prompt.
Login to MOFI using you name password like root / your password.
Try to run the following commands (you are restarting the services without rebooting the device):

/etc/init.d/dnsmasq restart
/etc/init.d/odhcpd restart
/etc/init.d/firewall restart

Do it one by one and every time when you executed the command look at the console window where you run ping - at some point I hope it should start working - then you found the service that causes the grief.

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by Didneywhorl » Mon Jun 22, 2020 7:35 am

Pure gold there, thank you for posting this info. Hopefully it helps the OP and many others!

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Re: Losing constant Internet connection on Mofi 4500 (and my mind)

Post by jmatthew » Mon Jun 22, 2020 10:06 am

Thank you SO MUCH for the guidance! I was able to do most of this, but I'm not sure it offered a lot of insight. You'll see below all of my activities after SSHing into the Mofi. It didn't seem to do anything with the odhcpd restart.

And: Even though Internet appeared to drop on all of our devices, I was able to successfully ping google.com from the command line, without any issues. (I didn't capture that below, but trust me, I did it before running the resets.)

So: I did a ping for google.com and it worked, I logged into the router and ran the restarts below, and pinged google.com again and it still worked. Yet all connected devices otherwise had no http connections. So frustrating!

Log dump below. Let me know if you spot any clues here, and thank you again so much for helping out!


-----------------------------------------------------

MOFI Version: 4.1.8-std

built on: #1 Fri Jun 12 16:20:35 EDT 2020

Commit: e112020a114efe821247d626336425369ec07ca1

-----------------------------------------------------

root@MOFI4500:~# /etc/init.d/dnsmasq restart

udhcpc: started, v1.25.1

udhcpc: sending discover

udhcpc: no lease, failing

root@MOFI4500:~# /etc/init.d/odhcpd restart

Command failed: Not found

root@MOFI4500:~# /etc/init.d/odhcpd restart

root@MOFI4500:~# /etc/init.d/firewall restart

Warning: Section @zone[1] (wan) cannot resolve device of network 'wan2'

Warning: Section @zone[1] (wan) cannot resolve device of network 'wan3'

Warning: Section @zone[1] (wan) cannot resolve device of network 'wan6'

Warning: Section @zone[1] (wan) cannot resolve device of network 'module_dhcpv6'

Warning: Section @zone[1] (wan) cannot resolve device of network 'apcli0'

* Flushing IPv4 filter table

* Flushing IPv4 nat table

* Flushing IPv4 mangle table

* Flushing IPv4 raw table

* Flushing IPv6 filter table

* Flushing IPv6 mangle table

* Flushing IPv6 raw table

* Populating IPv4 filter table

* Zone 'lan'

* Zone 'wan'

* Zone 'vpn'

* Rule 'Allow-DHCP-Renew'

* Rule 'Allow-Ping'

* Rule #10

* Rule 'WEB'

* Rule 'WEBSSL'

* Rule 'WEB8080'

* Rule 'SSH'

* Rule #15

* Rule #16

* Rule #17

* Rule #18

* Forward 'lan' -> 'vpn'

* Forward 'vpn' -> 'lan'

* Forward 'lan' -> 'wan'

* Populating IPv4 nat table

* Zone 'lan'

* Zone 'wan'

* Zone 'vpn'

* Populating IPv4 mangle table

* Zone 'lan'

* Zone 'wan'

* Zone 'vpn'

* Populating IPv4 raw table

* Zone 'lan'

* Zone 'wan'

* Zone 'vpn'

* Set tcp_ecn to off

* Set tcp_syncookies to on

! Unable to write value: No such file or directory

* Set tcp_window_scaling to on

* Running script '/etc/firewall.voip'

* Running script '/etc/firewall.pptpd'

* Running script '/etc/firewall.dmz'

* Running script '/etc/firewall-cloudlink.dmz'

* Running script '/etc/firewall.pfilter'

* Running script '/etc/firewall.user'

* Running script '/usr/lib/nodogsplash/restart.sh'

* Running script '/usr/share/miniupnpd/firewall.include'

ip6tables: No chain/target/match by that name.

* Running script '/tmp/firewall.mssfix'

root@MOFI4500:~# /etc/init.d/odhcpd restart

root@MOFI4500:~# ping google.com

PING google.com (172.217.7.14): 56 data bytes

64 bytes from 172.217.7.14: seq=0 ttl=117 time=39.835 ms

64 bytes from 172.217.7.14: seq=1 ttl=117 time=38.474 ms

64 bytes from 172.217.7.14: seq=2 ttl=117 time=38.486 ms

64 bytes from 172.217.7.14: seq=3 ttl=117 time=37.811 ms

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