New to this forum. Major problem

[degrub]

POE devices, too many or one with too much draw periodically, can cause overload of the current output at the switch.. This can result in unpredictable failures, both at the switch and/or the device. review the total power budget and voltage required versus what is provided by a switch. Check the 802.? compatibility (i forget the sub standards referenced). between the two.
If it is close, then consider powering one with an independent power injector. You can leave it unplugged to see if that helps.

Another long shot - power companies tend to resync the grid during the early morning hours and try to shift producers then as well. It would take a recording O'scope to catch that. It is more likely something local. UPS systems can help eliminate the issue if it is real at your location.

 

[Ronnie Bailey]

I was an industrial electrician in my past life. I recall chasing a similar issue, years ago, where one of the computer driven machines would just die. Took days of perseverance to track down the cause. I used a Dranetz line disturbance analyzer to track down the issue. What the analyzer showed was 1k volt spikes, (which is normal), that caused that particular machine to stop. The power supply for that machines computer, was not able to handle the spike, so it shut down (this is going back about 3o years). They did not have a power supply that could handle the spikes, so I had to find the cause if the spikes.

The power system used in the factory was 440 volt 3 phase, ungrounded. What was happening, a motor on one of the transfer machines in another dept, had a grounded lead. So when that motor was engaged, it created the 1,000 volt spike. Taped up the motor lead, and problem solved. Took days to find the cause.

Anyway, you may be onto something about power surges. Or is it possible one of my Android devices is generating some kind of noise that is causing my issue?? Also, why does it ONLY affect certain devices?? The devices it affects, seem to be Linux based.

1. HDHomeRun Dual OTA ATSC networked tuner. I have two different ones, but it only effects this one, and again, this only started within the last couple of weeks. Linux based????

2. Dahua IP cam, Linux based?? Again, only started in the last couple of weeks.

3. Android box running CoreELEC for my DVR server... PURE LINUX. Started a long time ago, but random.

4. Another Android box running LibreELEC.. PURE LINUX. just started a week or so ago.

5. Another Android box running OPENPHT, PURE LINUX. just started a week or so ago.

 

[Ronnie Bailey]

POE devices, too many or one with too much draw periodically, can cause overload of the current output at the switch.. This can result in unpredictable failures, both at the switch and/or the device. review the total power budget and voltage required versus what is provided by a switch. Check the 802.? compatibility (i forget the sub standards referenced). between the two.
If it is close, then consider powering one with an independent power injector. You can leave it unplugged to see if that helps.

Another long shot - power companies tend to resync the grid during the early morning hours and try to shift producers then as well. It would take a recording O'scope to catch that. It is more likely something local. UPS systems can help eliminate the issue if it is real at your location.

I have 5 IP cameras. I have one 4 port POE and one POE adapter. I was using the IP camera on the adapter and it would lose network connection every night. I moved it from the adapter to the 4 port POE switch and it still looses connection every night. Except, when I removed the Ethernet cable from the router to the entertainment center.

 

[Ronnie Bailey]

If you are curious why I have all those Android boxes, it is my hobby. Here is a link to my YouTube videos.

https://www.youtube.com/user/clarkss12/videos?view_as=subscriber

 

[degrub]

take a look in the router for the DHCP Lease table listing devices. What is the expire period (lease duration) for each ?

 

[degrub]

I have 5 IP cameras. I have one 4 port POE and one POE adapter. I was using the IP camera on the adapter and it would lose network connection every night. I moved it from the adapter to the 4 port POE switch and it still looses connection every night. Except, when I removed the Ethernet cable from the router to the entertainment center.

What happened 2-3 weeks ago ?
electrically ?
add any appliances or change out ?
anything else ?
any motor based devices that run during the night ? pumps, HVAC, refrig, etc ?

i think you may need to figure out what changed back then. Otherwise, it may be chasing ghosts in the machine.

 

[Ronnie Bailey]

What happened 2-3 weeks ago ?
electrically ?
add any appliances or change out ?
anything else ?

Nothing that I can think of....... EXCEPT I am always changing firmwares on my Android boxes. Mostly making them run Linux.

 

[degrub]

All on those devices only ?
can you revert ?

 

[Ronnie Bailey]

Now that I think about it, and my memory is very bad. About 4 or 5 years ago, one of my Android boxes was creating havoc (forget the details) with my network. I bought different Ethernet switches and even a new router. Turned out that one of my Android boxes was creating the problem. I just can't remember the details, only that it cost me $$$ replacing components that did not need to be replaced.

So, it appears that something like that is happening right now. I just have to figure out which device is causing the issue. I have already removed some of them from my network.

 

[ColinTaylor]

If they're Linux boxes then they should have their own system log files. That should tell you why they are loosing connectivity.

 

[Ronnie Bailey]

All on those devices only ?
can you revert ?

Yes, I run Linux on those boxes from microSD cards. So, I can remove the cards and run Android on them. But NONE of those devices are critical, except the one running my DVR, but I have almost retired it anyway.

 

[Ronnie Bailey]

If they're Linux boxes then they should have their own system log files. That should tell you why they are loosing connectivity.

That is a possibility.

 

[degrub]

Are you familiar with packet sniffer software ?
You might set up a network monitor on a linux box and see if there is any unexpected quantity or type of traffic.

 

[Ronnie Bailey]

This issue has already cost me one 16 port Ethernet switch ($85). Now I am ALMOST convinced it is NOT a hardware problem.

Somehow, one of my devices is injecting some data into the router and causing it to go nuts. But again, I know nothing about networking or how it works internally. All I know are bits. I go back to the days of binary, 40 or 50 years ago.

 

[Ronnie Bailey]

Are you familiar with packet sniffer software ?
You might set up a network monitor on a linux box and see if there is any unexpected quantity or type of traffic.

No, I am not familar with it at all. I have heard of them but never used one...... I am old now.......... LOL

 

[Ronnie Bailey]

I will be watch football now.........

Thanks for your help.........

 

[degrub]

it could be a device saturating a link. So maybe looking at the port lights would give a clue.

yeah i used to toggle switches to get our PDP 11 to boot and then load from the mag tape. Back in the assembler days....
If you have an idea of which devices were updated most recently or back then, start with taking them offline first.

 

[Ronnie Bailey]

it could be a device saturating a link. So maybe looking at the port lights would give a clue.

yeah i used to toggle switches to get our PDP 11 to boot and then load from the mag tape. Back in the assembler days....
If you have an idea of which devices were updated most recently or back then, start with taking them offline first.

I took 3 of my Linux boxes offline, that could be causing the issue. One of them I put online a week or two.

 

[Ronnie Bailey]

it could be a device saturating a link. So maybe looking at the port lights would give a clue.

yeah i used to toggle switches to get our PDP 11 to boot and then load from the mag tape. Back in the assembler days....
If you have an idea of which devices were updated most recently or back then, start with taking them offline first.

You must be as old as I am....... hahaha

 

[ColinTaylor]

Similar to what @degrub was alluding to make sure your devices don't have more than one network interface connected at the same time, i.e. Ethernet and WiFi. This can create network loops and broadcast storms.