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granjow
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hAP lite TC cannot be reached. Broken?

Wed Feb 01, 2023 11:17 pm

Hi again,

I still have my hAP and it still drives me mad.

I ran netinstall with the option to clear the configuration (OS 7.7) and then connected my laptop to ether2. Nothing else was connected. I ran ping (and nothing else) for some time, and after around packet 900 the hAP just stopped being there. Well, physically it still existed, but I got network unreachable from then on.

This is not the first time that the hAP just disappears. So far I blamed it on misconfiguration from my side most of the times, except when merely accessing the web UI caused it to UNREACHABLE itself again. (Repeatedly. Reboot, ping runs, open web, UNREACHABLE.)

Before I tried adding ether1 to the bridge interface (defcon), then I wanted to print the firewall settings (getting there took a few seconds, but autocomplete worked), and … UNREACHABLE. Weird was that the ether1 and ether4 LEDs were dimly lit, when connecting any port to RB260 the LED on the RB260 did not light up at all, not sure what that means. Reboot, LED lights up on the RB260, but I still cannot ping it as if it had forgotten that it should be doing network stuff.

Some time ago I tried connecting to it from Winbox, but in that state it did not even discover a MAC address until I netinstalled it over.

Any ideas how I can proceed? Is this guy just broken for no reason? Can I somehow MAC-ping it from my Linux?

Thanks,
Simon

edit: Downgraded to 6.49.7. Connected to it, added an SSH key to the user over the web UI, UNREACHABLE. After a minute it is reachable again and I can connect to it (only web, SSH key does not work), log shows reboot without shutdown, and /system routerboard print shows:
firmware: 6.45.9
firmware: 6.45.9
firmware: 6.49.7
 
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baragoon
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 10:59 am

Hi,
I have exactly tha same box for wifi during power cuts (powering with usb power bank).
I was "fighting" with hap lite TC after upgrade to 7.7 - it' totally unusable with ROS7, constant 100% CPU usage and reboots.
After downgrading to 6.49.7 I'm still observing CPU spikes but not for a so long time and it's looks like a almost stable at ROS6.

I have a big question to the Mikrotik team: why is ROS7 upgrade is available for that devices when they are totally unusable @ ROS7?
 
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rextended
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:05 am

Why Windows 7 can be still installed on Pentium 4 devices?
Last edited by rextended on Thu Feb 02, 2023 11:10 am, edited 2 times in total.
 
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baragoon
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:07 am

Why Windows 7 can be still installed on Pentium 4 devices?
ask M$ support
 
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rextended
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:10 am

Didn't you understand the comparison?
Now I understand...

If MikroTik had prevented RouterOS v7 from being installed (with the same type of platform) [I wouldn't even have compiled them for SMIPS and PowerPC],
surely someone complained that it prevented their installation.

Who always complains, one way or another, is always there,
but there are always those who don't understand that you can't expect that from a peripheral of a few years ago you can't get the same things from new operating systems.

Keep the system the device was designed for.
 
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baragoon
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:18 am

Keep the system the device was designed for.
Ok, I understand your position but how can I (or another customer) know that ROS7 isn't designed for hAP lite TC or vice versa?
https://mikrotik.com/product/RB941-2nD-TC any word of "recomended" ROS version on the product page.
BTW, the https://mikrotik.com/product/RB941-2nD- ... -downloads RouterOS current release points to ROS 7.7
 
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:22 am

I understand that it is not written,
But using common sense doesn't hurt...

The automatically updated links on the web page don't count, there isn't a person who gets there to update them manually,
there is an automatism, and this automatism is wrong.
 
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baragoon
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:28 am

But using common sense doesn't hurt...
That's not an answer for reasonable question
how can I (or another customer) know that ROS7 isn't designed for hAP lite TC or vice versa?
 
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:32 am

The practical sense of things teaches me, before changing the operating system for another,
to read up on a minimum on the forums where they talk about it, instead of relying exclusively on the manufacturer.

Well, here on the forum it is chock full of posts where clearly the SMIPS architecture is not recommended for v7, including posts from MikroTik staff users.

This obviously doesn't justify not writing it directly on the download page and stopping compiling it for SMPIS and PowerPC.
 
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:38 am

Weird was that the ether1 and ether4 LEDs were dimly lit, when connecting any port to RB260 the LED on the RB260 did not light up at all, not sure what that means.
As soon as you are able to connect to the device, disconnect ports 1 and 4. There is a good chance that they are damaged. And test that the device is working properly.
I ran netinstall with the option to clear the configuration (OS 7.7) and then connected my laptop to ether2. Nothing else was connected. I ran ping (and nothing else) for some time, and after around packet 900 the hAP just stopped being there.
When there is no configuration, the device has an IP address of 0.0.0.0 and you can only connect to it by MAC. Ping is not possible.
 
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 02, 2023 11:55 pm

I'm curious what you are using as a power supply, I have a hAP Lite running on 7.8beta2 working fine.
 
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baragoon
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Re: hAP lite TC cannot be reached. Broken?

Fri Feb 03, 2023 4:02 pm

I'm curious what you are using as a power supply, I have a hAP Lite running on 7.8beta2 working fine.
weird, mine was always 100% CPU and constant reboots on 7.7
 
granjow
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Re: hAP lite TC cannot be reached. Broken?

Sat Feb 04, 2023 6:10 pm

So after the last post I went back to Version 6.49.7 (stable). Now I just powered on the hAP and started pinging it. Same pattern as before: After around packet 1000, connection is dropped. No lights on the ether2 port (where I connected my laptop to). Shortly after it recovers.
64 bytes from 192.168.88.1: icmp_seq=1086 ttl=64 time=0.556 ms
64 bytes from 192.168.88.1: icmp_seq=1087 ttl=64 time=0.790 ms
64 bytes from 192.168.88.1: icmp_seq=1088 ttl=64 time=0.789 ms
From 192.168.88.123 icmp_seq=1089 Destination Host Unreachable
From 192.168.88.123 icmp_seq=1090 Destination Host Unreachable
From 192.168.88.123 icmp_seq=1091 Destination Host Unreachable
[..]
From 192.168.88.123 icmp_seq=1199 Destination Host Unreachable
From 192.168.88.123 icmp_seq=1200 Destination Host Unreachable
64 bytes from 192.168.88.1: icmp_seq=1201 ttl=64 time=2049 ms
64 bytes from 192.168.88.1: icmp_seq=1202 ttl=64 time=1026 ms
64 bytes from 192.168.88.1: icmp_seq=1203 ttl=64 time=1.54 ms
64 bytes from 192.168.88.1: icmp_seq=1204 ttl=64 time=0.582 ms
64 bytes from 192.168.88.1: icmp_seq=1205 ttl=64 time=0.728 ms
So, let's check whether it again downgraded to the built-in firmware version, right?
64 bytes from 192.168.88.1: icmp_seq=1310 ttl=64 time=0.732 ms
From 192.168.88.123 icmp_seq=1311 Destination Host Unreachable
From 192.168.88.123 icmp_seq=1312 Destination Host Unreachable
As soon as I press “Login”, hAP goes offline. After some time, the status LED blinks 3 times, and a minute later it is online again. Still, as soon as I try to connect to it, it goes offline. I don't even get to the login screen anymore. Maybe an ether2 problem? (I did not have the dimly lit LED anymore though.) So, I test ether3 and get the same behaviour. Well then, how about SSH? I do ssh admin@192.168.88.1 and again, unreachable immediately.

(I'm using the original PSU, CPU shows 2 % when I can connect to it.)

I remove power, I power it on again, now I get to the login screen, but after pressing the button, it crashes again.

Siriusly, what evil snape is biting this AP? Why is it better after an overnight power off break and worse when I retry right again?If it is not software, then it may be something temperature related … so let's open the hAP and find inside, besides lots of air, a thin PCB. Thermal camera on, first pic, press F5 on 192.168.88.1, second pic.
ThermalCamera2023-02-04_16-48-08+0100.png
ThermalCamera2023-02-04_16-52-20+0100.png
There is one component which is getting hot. IR camera says 50 °C when I get close, which is by far not close to typical limits of electronical components, but as the part is rather small, the camera may well be off and it could be that this part is heating up to 100 °C and more. It is Q301, so some kind of transistor, which is also bad because a hot transistor means a lot of current that flows.

So this might be the reason, only Mikrotik could confirm though as this requires knowledge of the circuit (or at least more knowledge than I have).
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granjow
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Re: hAP lite TC cannot be reached. Broken?

Sat Feb 04, 2023 6:17 pm

The practical sense of things teaches me, before changing the operating system for another,
to read up on a minimum on the forums where they talk about it, instead of relying exclusively on the manufacturer.

Well, here on the forum it is chock full of posts where clearly the SMIPS architecture is not recommended for v7, including posts from MikroTik staff users.

This obviously doesn't justify not writing it directly on the download page and stopping compiling it for SMPIS and PowerPC.
And on that (off-)topic: If this is true that everybody including Mikrotik knows 7.x does not work with SMIPS, then it's very sad if Mikrotik still puts this on the web site as recommended download for a SMIPS router. That is SO not what you do in 2023. Imagine we had to check forum posts for every single mobile app, driver, Windows update, whatever. We'd spend our lifetime reading nothing but release notes and customer experience to find out if stuff is going to explode when updating.

Today, I expect that if there is a download link and it says HIGHLY EXPERIMENTAL AND IT WILL PROBABLY BREAK YOUR DEVICE AND YOUR BANK ACCOUNT AND STUFF, then it probably does not always work as intended, but if there is no such text, then it should WORK.
 
granjow
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Re: hAP lite TC cannot be reached. Broken?  [SOLVED]

Thu Feb 09, 2023 11:39 am

Contacted support, concluded that it is probably broken.
 
hecatae
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Re: hAP lite TC cannot be reached. Broken?

Thu Feb 09, 2023 6:00 pm

@granjow thank you for the photos, the only other close ups of the board are on the Openwrt wiki.
 
granjow
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Re: hAP lite TC cannot be reached. Broken?

Tue Feb 14, 2023 11:23 pm

Just out of interest, why would they be helpful? :D
(The ones you mentioned are of better quality than those of the IR built-in camera too)

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