Connection Disconnect - ZBT-WG1608 issues

[ςЯaʒyн0ʁ§ëto]

Hi everyone!

I'm running a ZBT-WG1608 (16M) / MediaTek MT7621 /GoldenOrb_2022-08-25 (OpenWrt 21.02 SNAPSHOT

I have been doing some searching on this forum and could find nothing that might be comparable to my issue. I love to tinker when it comes to technology, however I am no technology specialist. I'd consider myself a borderline newbie still. So please go easy on me.
The issue I am having is my wan0 drops connection, which forces the external IP to drop. This forces a reboot of the modem. Also I have a box connected that overrides other device's assigned IP addresses...



Attached is a system log file.


Thank you in advance for any help!

[Didneywhorl]

There may be a hardware watchdog present that is not seeing the connection, causing the wan0 to ifdown/ifup.

Does your wg1608 have the watchdog enabled?

[ςЯaʒyн0ʁ§ëto]

There may be a hardware watchdog present that is not seeing the connection, causing the wan0 to ifdown/ifup.

Does your wg1608 have the watchdog enabled?

Hi,

Thank you for the reply, may I know where I need to go to locate this "watchdog"?

Thank you

[Didneywhorl]

WG1608-Watchdog-Jumper.png

If this 0 Ohm resistor isn't there as a jumper, then you have the hardware watchdog turned ON. If the resistor is there, you're good.

[ςЯaʒyн0ʁ§ëto]

Hi,

Thank you for the update, is there a way to check through the router settings to see instead of having to open the unit?

Thank you

[Didneywhorl]

Nope.

[ςЯaʒyн0ʁ§ëto]

Attached is an updated system/kernal log... recently disconnected... Seems to be condensed and easier, perhaps to find issue.

Thank you

[ςЯaʒyн0ʁ§ëto]

WG1608-Watchdog-Jumper.png

If this 0 Ohm resistor isn't there as a jumper, then you have the hardware watchdog turned ON. If the resistor is there, you're good.

Just confirming I have the 0 Ohm resistor.

[ςЯaʒyн0ʁ§ëto]

Nope.

Any suggestions, since I determined that the jumper is installed?

[Didneywhorl]

Give us more details if you would. Not everyone will read the kernel log file unfortunately, though I do.

What I see is a ton of dhcp server errors and a software watchdog (ping tests) resetting the modem.

I would remove all the extra features (base factory defaults) and setup one new thing at a time until you find the breakdown.

You have too much going on to simply ask why your having disconnects.

The reboots are from the ping tests/watchdog failing. It cant send out icmp checks to 1.1.1.1 and so its resetting the interface.

[mtl26637]

If you sort through the 2nd log you will find :

Code: Select all

Sun Sep  4 12:33:46 2022 user.info mwan3track[12895]: Check (ping) failed for target "1.1.1.1" on interface wan1 (wwan0). Current score: 10\
Sun Sep  4 12:33:50 2022 user.info mwan3track[12895]: Check (ping) failed for target "1.0.0.1" on interface wan1 (wwan0). Current score: 10\
Sun Sep  4 12:33:50 2022 user.notice mwan3track[12895]: Interface wan1 (wwan0) is disconnecting\
Sun Sep  4 12:33:50 2022 user.notice URL-DEBUG: hotplug (iface): action='disconnecting' interface='wan1'\
Sun Sep  4 12:33:56 2022 daemon.info dnsmasq-dhcp[7796]: DHCPREQUEST(br-lan) 192.168.1.208 00:1a:79:74:62:1a\
Sun Sep  4 12:33:56 2022 daemon.info dnsmasq-dhcp[7796]: DHCPNAK(br-lan) 192.168.1.208 00:1a:79:74:62:1a address in use\
Sun Sep  4 12:33:59 2022 user.info mwan3track[12895]: Check (ping) failed for target "1.1.1.1" on interface wan1 (wwan0). Current score: 9\
Sun Sep  4 12:34:01 2022 kern.warn kernel: [22385.663612] ------------[ cut here ]------------\
Sun Sep  4 12:34:01 2022 kern.warn kernel: [22385.668299] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:473 dev_watchdog+0x2fc/0x304\
Sun Sep  4 12:34:01 2022 kern.info kernel: [22385.676602] NETDEV WATCHDOG: wwan0 (qmi_wwan): transmit queue 0 timed out\

The watchdog (mwan3 ping test) seems to be working normal but looks like your device is freezing up while sending data (transmit queue timeout). I've seen this on various quectel modems. It can be caused by various things such as overheating or not enough power, etc. What mode is it running in? If QMI, might try MBIM or something different, might get lucky.