Kitz Forum
Broadband Related => Broadband Hardware => Topic started by: npr on March 19, 2015, 09:46:34 AM
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I'm looking for the details printed on the powers supply which comes with a ZyXel VMG8924-B10 router, can anyone with one of these routers please post the details.
I got the router from ebay and it's proved to be very unstable, many reboots and it's made a right mess of my dlm profile.
The router says it needs 12v at 2A, but the powers supply I received is only rated at 12v 1A and it looks identical to the one from a TG582n router. I'm assuming the power supply is the problem and would like to check these details before I go back to the seller.
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I am using my 8924 at present but I just checked my 8324 (actually an F1000) and that comes with a 12V 1.5A PSU and certainly that gave me no issues.
Stuart
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Hi
I'm looking for the details printed on the powers supply which comes with a ZyXel VMG8924-B10 router, can anyone with one of these routers please post the details.
I got the router from ebay and it's proved to be very unstable, many reboots and it's made a right mess of my dlm profile.
The router says it needs 12v at 2A, but the powers supply I received is only rated at 12v 1A and it looks identical to the one from a TG582n router. I'm assuming the power supply is the problem and would like to check these details before I go back to the seller.
I've just looked at my 8924 and it is 12 volts 2 amps. I would think a 1 amp supply is the cause of your problems, I'm surprised it boots.
Check your PMs, sent you a message.
Regards
Phil
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I dont have a VMG8924, but what I can confirm is that my VMG8324 is an official Zyxel and its power supply looks nothing like the DC 12V 1A PSU from the tg582n.
I cant check my own Power supply though as its plugged in... but according to the Zyxel specs
VMG 8324 Power supply: 12 V DC 1.5 A
VMG 8924 Power supply: 12 V DC 2 A
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Philip replied whilst I was messing around digging out my TG582n Power Supply
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Thanks for the replies. The seller has told me she has found the correct power supply and is posting it today.
Finger crossed.
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Well the correct PSU arrived this morning and the router was up for about 3 hours before rebooting >:(
The error in the log showed "Out of MDM shared memory need to reboot", same as with the previous PSU.
Interestingly the reboot was while I was using the GUI, IIRC previous reboots were always while using the GUI or telnet.
Running firmware (AAKL.7)C0 at present, previously tried AAKL6b4 with the same result. About to try AAKL6b.1
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Hi
Sounds a similar to issue which I've been experiencing, although I haven't looked at the event logs as I didn't expect them to survive a reboot, and currently it's disconnected with the Billion back in place.
Interestingly, and this may cause me a problem with the return as they said they will test it and if no fault found a restocking fee is levied, is when it's not connected to the WAN and just has one Wi-Fi client, it's rock solid, and doesn't reboot, or at least I can't make it reboot no matter what I do in the Web interface. It only seems to become unsteady when it's all plugged in actively in use (around 3 or 4 Wi-Fi clients although not all necessarily active as just mobiles or tablets sat idle, 3 PCs, one networked amplifier and a set-top box), which points to a memory issue, and presumably loading the Web GUI and making changes is enough to push it over the edge.
I'll give it a go again later to see if it falls over and what the error message is in the logs.
How many clients do you have connected?
Regards
Phil
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I had reduced it down to two wireless clients, one of which was in sleep mode most of the time.
I've now installed 6b1 firmware, I also found the log file to be pretty large both system and security ( the contents had survived a factory reset ) so I've emptied those and stopped all logging.
2 hours up time and still no reboot, fingers crossed.
What "memory usage" does yours show, mine appears stuck on 58%.
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Hi
Well I've tried putting it back on to see if I can catch a reboot event in the log. It was all working fine until I connected it up to the WAN, then the Web GUI froze when I was adding the ISP login details and now it will no longer complete a boot sequence so guessing it is a corrupt configuration again. I'm not going to factory reset it again as now at least the seller gets it back not working at all, apart from some lights on the front.
I still think mine must be faulty.
I did think the event log might be causing a problem so did clear mine and then stopped it logging altogether, however as the event log survives a power cycle it must be saved into flash memory, which I don't think would cause the run-time out of memory errors which I would think relates to RAM.
You can see the MDM memory situation via Telnet, just type meminfo and it's there, not much memory is shared. My Billion has the same command and shows it has slightly less memory assigned as shared, and as that runs for months and never reboots, I assume the ZyXEL have a memory leak.
I did find another reference to this error on the Internet http://gathering.tweakers.net/forum/list_messages/1501722/84 and that was a ZyXEL as well, alas I can't confirm if my problems are logging the same error before a reboot.
Memory usage was about the same, however I don't think that is the same memory the MDM error refers to.
Regards
Phil
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I haven't had any lockups so our faults may not be the same.
Thanks for the telnet command.
> meminfo
Total MDM Shared Memory Region : 672KB
Shared Memory Usable : 000532KB
Shared Memory in-use : 000196KB
Shared Memory free : 000335KB
Shared Memory allocs : 2040736
Shared Memory frees : 2037104
Shared Memory alloc/free delta : 003632
Heap bytes in-use : 000016
Heap allocs : 000104
Heap frees : 000103
Heap alloc/free delta : 000001
Looks to be plenty of free memory but not sure about "allocs" being greater then"free".
6 hour up and still going strong. I'll give it a few days before going back to the latest firmware to see if that breaks things again.
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I have the same MDM error and crash when on the GUI on L5, B1 and the latest firmware. I also have full local logging enabled - I didn't suspect that would cause an issue thought it would simply erase older log entries. I'll cut down the logging and see if it makes any improvement.
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Well after clearing logs, and reducing the amount being locally logged it does definitely seem to make an improvement to stability. I am now going to move back to L7 and see what happens.
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Hi
Thanks for the update. I'd recommend feeding this back to ZyXEL support as of course the log should be self managing, it should clear itself if getting full.
Regards
Phi
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I've been running a script (from a RPi) to monitor the "Shared Memory free" level.
Over a 10 hour period, with high usage of the routers GUI, it went from around 300KB progressively down to 38KB, it stuck there for a couple of hours before rebooting.
I also ran the script for a period where I didn't access the GUI. It started at 342KB and after 11 hours it still showed 338KB. Unfortunately by this time I was getting bad packet loss so had to manually reboot.
It's early days yet, but it looks like the memory issue it related to how much the routers GUI is accessed ( I was using Firefox).
Not sure about the packet loss issue, switching gateway didn't help so I suspect that was a router related issue too.
At present I'm waiting a reply from ZyXEL support, I'll report back if anything comes from that.
PS
I second PhilipD's recommendation of reporting this issue to ZyXEL support.
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In case it helps I have run meminfo on my 8924 which has now been up for 8 days 6 hours first is just the command with no gui being used
> meminfo
Total MDM Shared Memory Region : 672KB
Shared Memory Usable : 000531KB
Shared Memory in-use : 000203KB
Shared Memory free : 000328KB
Shared Memory allocs : 9067658
Shared Memory frees : 9063894
Shared Memory alloc/free delta : 003764
Heap bytes in-use : 000016
Heap allocs : 000104
Heap frees : 000103
Heap alloc/free delta : 000001
>
and this is with gui being logged into
> meminfo
Total MDM Shared Memory Region : 672KB
Shared Memory Usable : 000531KB
Shared Memory in-use : 000203KB
Shared Memory free : 000328KB
Shared Memory allocs : 9089724
Shared Memory frees : 9085960
Shared Memory alloc/free delta : 003764
Heap bytes in-use : 000016
Heap allocs : 000096
Heap frees : 000095
Heap alloc/free delta : 000001
>
Note I have not been having this problem with mine.
Stuart
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Thanks, this is my log from today: :-\
Router Rebooted at 9:30
240315 10:00:01 -- Shared Memory free : 000290KB
240315 10:30:02 -- Shared Memory free : 000290KB
240315 11:00:02 -- Shared Memory free : 000289KB
240315 11:30:02 -- Shared Memory free : 000290KB
240315 12:00:01 -- Shared Memory free : 000290KB
240315 12:30:01 -- Shared Memory free : 000289KB
240315 13:00:02 -- Shared Memory free : 000289KB
240315 13:30:02 -- Shared Memory free : 000289KB
240315 14:00:02 -- Shared Memory free : 000289KB
Spent 15 minute using the routers GUI (Chrome Browser)
240315 14:30:01 -- Shared Memory free : 000129KB
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I already had a support request open with Zyxel on the MDM issue and have forwarded the details to see if this might help them resolve it.
Curious if anyone could monitor the GUI memory with full local logging enabled.
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I'm about to take my ZyXEL off line to see if another modem/router will repair the damage done by the DLM.
Will not be much to log when off line but I'll give it a go. If you've got a Raspberry Pi and wish to log the memory level yourself I'll post the logging scrip
I notice in the firmware V1.00(AAKL.7)C0.zip file there's a .rom file, this appears to be a backup/restore conf file. I plan on reloading this firmware and seeing if the .rom file will restore the default settings. Doing a factory reset doesn't completely renew the conf setting so there may be something corrupt there.
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Curious if anyone could monitor the GUI memory with full local logging enabled.
For what is worth:
vdsl was disconnected all logging features were enabled.
Logging was probably not very active so that didn't prove much.
Surprisingly GUI use had no affect on the shared memory level, perhaps it's my poor quality line this router doesn't like.
Router Off Line --- all logging features enabled
240315 19:21:33 -- Shared Memory free : 000347KB
240315 19:30:01 -- Shared Memory free : 000347KB
###### 10 minutes using the router GUI
240315 20:00:02 -- Shared Memory free : 000346KB
###### another 10 minutes using the routers GUI.
240315 20:30:01 -- Shared Memory free : 000346KB
240315 21:00:02 -- Shared Memory free : 000346KB
240315 21:30:01 -- Shared Memory free : 000345KB
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Hi
It wouldn't surprise me if it is just a particular aspect of using the Web UI that suddenly sees a memory leak and that it has to be connected and passing traffic to see the bug. I found my 'faulty' ZyXEL seems completely stable when not connected to the WAN, then as soon as it was passing traffic, it become very unstable. OF course it isn't much use to me if not connected to the outside world :-\
Regards
Phil
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I am following this with interest as so far I've not had any issues with mine. This morning I decided to download a 1.4gb ISO while using the gui extensively and it all worked just fine. So I beginning to believe that maybe the two of you actually have faulty routers rather than it being a generic problem.
Stuart
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broad, now I've reduced the local logging to minimum and cleared the old logs the GUI seems to be responding normally and no longer crashing.
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broad, now I've reduced the local logging to minimum and cleared the old logs the GUI seems to be responding normally and no longer crashing.
I'm still logging everything I have active, so the log is quite busy and I've never cleared it.
Stuart
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The story so far:
Upgraded to firmware 7C0 > factory reset > installed the .rom file from the firmware zip file.
Memory log:
Installed Firmware 7C0 + factory reset + rom file installed
On Line
240315 17:10:01 -- Shared Memory free : 000335KB
240315 17:16:13 -- Shared Memory free : 000334KB
240315 17:20:02 -- Shared Memory free : 000333KB
250315 17:30:52 -- Shared Memory free : 000333KB
Used router's GUI
250315 17:40:01 -- Shared Memory free : 000146KB
250315 17:42:26 -- Shared Memory free : 000146KB
250315 17:50:01 -- Shared Memory free : 000146KB
250315 18:00:02 -- Shared Memory free : 000119KB
250315 18:10:01 -- Shared Memory free : 000119KB
250315 18:20:02 -- Shared Memory free : 000119KB
250315 18:30:01 -- Shared Memory free : 000092KB
250315 18:40:02 -- Shared Memory free : 000093KB
Upgraded to the new firmware 8b2
Memory log:
Firmware updated to 8b2
On Line
Connected via ethernet
250315 18:50:01 -- Shared Memory free : 000333KB
250315 19:00:02 -- Shared Memory free : 000331KB
Changed to wifi connection
######### Intermittent use of GUI
250315 19:14:50 -- Shared Memory free : 000330KB
250315 19:20:01 -- Shared Memory free : 000330KB
######### 10 minutes of solid GUI usage
250315 19:30:02 -- Shared Memory free : 000330KB
######### Intermittent Gui Usage
250315 19:40:01 -- Shared Memory free : 000330KB
250315 19:50:02 -- Shared Memory free : 000330KB
250315 20:01:03 -- Shared Memory free : 000330KB
250315 20:10:01 -- Shared Memory free : 000330KB
Bit early to say the new firmware has fixed my issue, but it's looking good. ;D
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My power supply for my VMG8924 is gone.
I need to get a new one and I will get a generic one.
I know the power needs are 12V and 2A but do you know the DC barrel connector type?
Is it 2.5mm 5mm (inner/outer)?
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I'm pretty sure it's the 2.5mm inner size as I have power plugs from other routers (eg HG635) that don't fit as their inner is too small so the Zyxel is the larger one.
A supply from a HomeHub 5 (type B only) or Technicolor TG589vac are the correct rating and will fit
:)
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I will check those from Thomson as well.
Do you know if the positive is on the internal side? I should be.
Would be possible if someone takes a picture of the original power supply.
I throw away mine and I forgot to take a picture
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Most Router power supply plugs will have the inner contact as the + positive and outer contact as - negative if your not sure always use a a electronic volt meter it should be able to distinguish the DC polarity
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My power supply for my VMG8924 is gone.
I need to get a new one and I will get a generic one.
I know the power needs are 12V and 2A but do you know the DC barrel connector type?
Is it 2.5mm 5mm (inner/outer)?
As best as my vernier gauge can tell it's 5mm outer, 2mm inner (tried to push it to 2.5mm but it doesn't look like it is). Inner is positive 12V, outer is 0V. I've got a bunch of loose plugs, some of which I used when I hooked all the routers up to a 12V DC battery supply, but darned if I can recall now what the dimensions of the plugs are!
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Thanks for the info
To be more precise the outer is 5mm and the inner 2.1mm (I don't think if there is any 2mm).
The tip is 12V and the sleeve the GND and the max output current 2A.