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uldis
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Re: RB751U-2Hn frequent (daily) reboots

Thu Apr 12, 2012 1:10 pm

please contact support@mikrotik.com with the support output file attached after the reboot.
One suggestion would be to check if the board reboots if you set the watchdog-timer to no.
 
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jhheider
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Re: RB751U-2Hn frequent (daily) reboots

Fri Apr 13, 2012 7:46 am

Uldis,

I have an open ticket with support, #2011121366000676, open for 122 days. I sent supouts on:

2011-12-13
2011-12-14
2011-12-14
2011-12-16
2012-01-10
2012-01-30

The last response I received from support was on 2012-01-03, suggesting I try 5.12rc1 (no improvement).

I will send an additional supout the next time it reboots. It didn't seem to reboot under load with watchdog disabled, but had a high-incidence of lockups on calling /system reboot (all lights solid, no activity) requiring a power-cycle.

If there is anything further I can do to aid this investigation, since this problem has been reported by multiple people, please don't hesitate to let me know.
 
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Re: RB751U-2Hn frequent (daily) reboots

Tue Apr 17, 2012 5:48 pm

We also experience reboot problems with one of our RB751U which is used as a hotspot. Usually it reboots every day in approximately a peak time. However currently we have 5d uptime without reboot and only see 100% CPU utilization in peak time when it rebooted. Today we've discovered that CPU is utilized by 'flash' process:
[admin@MikroTik] > tool profile 
NAME                    CPU        USAGE
wireless                all         1.5%
www                     all         0.5%
ethernet                all           0%
console                 all         2.5%
flash                   all        92.5%
ssh                     all           0%
firewall                all           0%
hotspot                 all           0%
management              all           1%
profiling               all         1.5%
queuing                 all           0%
routing                 all           0%
bridging                all           0%
unclassified            all         0.5%
Does someone have an idea what 'flash' process is trying to do? Is it trying to read/write something from/to flash? It's definitely not a log because we are forwarding all the logs to external host... so what else?
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Apr 18, 2012 1:25 pm

To all
We bought about 20 days agò (so new type of hardware) 5 units of this routerbard for test

now
one is ok
the rest show problems when there are traffic or many users
they do not respond on ping and to the other request (snmp, ethernet lookup etc etc)

we want buy 100 or more piece of them but due to this trouble
and due to big delay to resolve it we will move to another board or another vendor (ubiquity )

Mikrotik, please stand up and resolve it
I see troubles on forum from november 2011 (6 months is too much)
i will wait only another week,
after that we will decide to drive my project to another direction and i hope the others do the same

Stefano
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Apr 18, 2012 9:40 pm

I had simillar random reboot issues. They were caused by by higher temperature of environment. After moving to cooler place the problem are gone.
 
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Re: RB751U-2Hn frequent (daily) reboots

Thu Apr 19, 2012 2:28 am

We too are experiencing this on RB750GL. Same process "flash" is using high cpu and eventually triggering the watchdog timer.
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normis
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Re: RB751U-2Hn frequent (daily) reboots

Thu Apr 19, 2012 1:16 pm

We too are experiencing this on RB750GL. Same process "flash" is using high cpu and eventually triggering the watchdog timer.
this is off topic, a different issue. you need to contact support with your RIF file and we will see why Flash process is running so actively.

about the above RB751U problems - you all need to send your RIF files to support, make the files as close to the problem as possible.
No answer to your question? How to write posts
 
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Re: RB751U-2Hn frequent (daily) reboots

Thu Apr 19, 2012 2:57 pm

this is off topic, a different issue. you need to contact support with your RIF file and we will see why Flash process is running so actively.
Sorry Normis, I wrongly assumed since it was also 7xx series that it was the same issue. I have emailed support.
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 23, 2012 10:04 am

Please all try v5.15, we have fixed some RB751U problems there.
No answer to your question? How to write posts
 
sanya
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 23, 2012 12:44 pm

you need to contact support with your RIF file and we will see why Flash process is running so actively.
about the above RB751U problems - you all need to send your RIF files to support, make the files as close to the problem as possible.
We were trying to create supout.rif while experiencing high CPU load by flash process with no success. 30 minutes wait - and RIF still was not ready. Sorry that I didn't mention this before.

Just replaced RB751U with RB751G in field... wondering does it experience the same problem (hardware is slightly different).
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 23, 2012 3:33 pm

Please all try v5.15, we have fixed some RB751U problems there.
Then I hope there are still changes compared to 5.15RC1.
I got one in the field, 100% CPU, can't ssh / winbox to it (doesn't accept the password).
I had it rebooted by a local user, comes up at immediatelly 100%, still unable to login. I go onsite tonight.
It was running 5.15rc1 for less then a week. I get so bored of that RB751U-2HnD thing!
Last edited by Beone on Mon Apr 23, 2012 3:41 pm, edited 1 time in total.
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 23, 2012 3:40 pm

there have been at least ten v5.15rc releases, so yes, definitely
No answer to your question? How to write posts
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 23, 2012 3:42 pm

there have been at least ten v5.15rc releases, so yes, definitely
Ok, we'll see after tonight.
You guys sure owe me (and lots of others...hahahha) a few beers for all the hell i'm going through with that device :-)
 
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Re: RB751U-2Hn frequent (daily) reboots

Tue Apr 24, 2012 11:37 am

New firmware installed yesterday
24 Hours and all seem to working

we'll wait next days but .. at now seem to be a good job

Thanks mikrotik I have not lost hope with you
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri Apr 27, 2012 1:37 pm

As I mentioned before we've replaced RB/751U with RB/751G in the field. RouterOS version was left the same 5.14 (not 5.15) to see is there a difference between similar devices. What can I say? 3 days uptime without any issues on 751G where 751U shown issues every day. We leave it there for long holidays until 10 May to be sure that 751G really doesn't have issues discussed here. At the same time, do you know the possible difference between 751U and 751G which can produce issues on first one and does not produce issues on second one? Maybe it can help understanding the root cause of 751U problem.
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri Apr 27, 2012 7:13 pm

Still having issues on the release 5.15 with CPU. Just had it spin out to 100% during 100MB upload, but it recovered without rebooting after the upload completed.

U and G differ, by the spec sheet, in port speed (obviously), CPU, and RAM. What does your RAM max at? I always felt that the various issues the 32MB routerboards have had (the 750s spent a long time running out of RAM and locking up on us in late 4.x) has been related to optimistic belief that 32MB is enough RAM. I've never seen a single one of the same problems in an RB with 64MB of RAM.
 
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Re: RB751U-2Hn frequent (daily) reboots

Sat Apr 28, 2012 6:32 pm

Today is more than 5 days of 751G uptime without any issues. And, jhheider, you may be right, our 751G has 64MB of RAM. But much more than 32MB is free:
[admin@MikroTik] > system resource print 
                   uptime: 5d6h7m39s
                  version: 5.14
              free-memory: 46360KiB
             total-memory: 62196KiB
However only developers know exactly how much RAM they need during peak operations. Wondering whether high CPU utilization by 'flash' process on 751U is an attempt to swap memory to disk?
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Apr 30, 2012 8:59 pm

That's my most current guess. I recall having similar OOM issues plaguing 750s early last year, that the 4xx and 750Gs didn't have.
 
sanya
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Re: RB751U-2Hn frequent (daily) reboots

Fri May 04, 2012 12:47 pm

Yesterday we've replaced back 751G by 751U upgraded to 5.15. I would say it works much much better. At the moment 23 hours uptime without any issues like reboots or high CPU utilization. Let's see how it feels next few days.
 
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Re: RB751U-2Hn frequent (daily) reboots

Sat May 05, 2012 12:08 am

I am having a problem with defective RB450G hardware. See my post here.

I maintain that they are defective because they perform the reboots when sitting idle performing no function other than consuming watts.
...too many RB450Gs
 
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Re: RB751U-2Hn frequent (daily) reboots

Tue May 08, 2012 2:01 pm

Last night we got a crashed hotspot running RB751U-2HnD and ROS 5.15. CPU was at 100%.
Walled garden was reachable for the users, but hotspot login page didn't show anymore. A reboot fixed it.
I have other RB751U-2HnD's (configured as hotspot) running 5.15 that didn't show any issues so far (uptime +1 week), so many things got better since we 've started this thread. We'll see what the next days/weeks bring us.

kind regards
 
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Re: RB751U-2Hn frequent (daily) reboots

Thu May 10, 2012 8:33 pm

Ok, another crash today on another router running 5.15.
It doesn't reboot anymore, but all trafic seems to stop. Walled garden stays reachable.
EDIT: Just read there's a beta of 5.16, I mailed support to get a copy.
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri May 18, 2012 6:49 am

At Mikrotik's request, I have disabled SNMP on my devices having issues. It does seem like SNMP might be the culprit. I've been up for 2.5 days, which is pretty much a recent record. Of course, I'm quite blind without SNMP, but this seems to at least make the hardware operable until a more permanent solution is found.

I've seen worse results in networks with a greater number of Apple products, specifically Mac Book Pros and iPad2s, that I know of. This might be something to correlate.

Jacob
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri May 18, 2012 10:16 am

I have similar issues with RB751-2Hn (or whatever its called), constant disconnects especially with android devices. When android device tries to connect after being in standby rb prints out a bunch ... from unknown client... messages and becomes unresponsive for a five minutes or so, sometimes turning off and on must be done, responds to ping but no traffic and can't connect with winbox or telnet. No queues, firewall or any advanced things, just simple home ap with wireless users in ACL and a pppoe client for internet.

Tried 5.14, 5.15 and now running ver 6 ros, same thing.

Three days ago I have put another device to act as pppoe client, 751 connected with cable to it and now seems to work fine. If this happen to fix rb I will send support.rif, didn't want to do that before I'm 100% sure this is not my fault (placement, wireless settings...).
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun May 20, 2012 6:54 pm

Since RouterOS 5.15 we have no significant issues. Sometimes CPU usage increases but RB recovers without rejecting service. Currently we have 17 days uptime. Wondering do we have to try 5.16 or leave it as is :)
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon May 21, 2012 6:57 am

Since RouterOS 5.15 we have no significant issues. Sometimes CPU usage increases but RB recovers without rejecting service. Currently we have 17 days uptime. Wondering do we have to try 5.16 or leave it as is :)
Go for 5.16, 5.15 stops all traffic over wireless after some heavy load.
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed May 30, 2012 8:50 pm

The undocumented SNMP fixes in 5.17 made a *HUGE* difference. I ran 20Mbps of Debian torrents through my 751 for 2.5 hours without a crash. If it's not 100%, it's very, very close now.
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jun 25, 2012 9:18 pm

Close, but not quite. If you have watchdog enabled, flash will go to 100% on the first SNMP query of the device, and stay there until the traffic ceases. This will cause watchdog to reboot the router, and management sessions to become unresponsive (making harvesting supouts difficult/impossible). Same behavior on 5.18.

RB951-2n, on the other hand, doesn't seem to have these problems. That was a pleasant surprise. So, that might be my new go-to device.
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jun 25, 2012 10:01 pm

That is good to hear some positive feedback on the 951! Maybe I wont feel like such a freaking beta tester if I decide to buy more MT devices. I get all excited about MT. But when they have all sorts of problems and its hard to see them take ownership of them, its hard to put any real faith in them. So, here's to the new 951 then... :)

Sent from my DROIDX using Tapatalk 2
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jun 25, 2012 10:06 pm

justfishing, I felt the same way about the 951, based on 9 months of issues with the 751U, and mikrotik not being able to make it stable. I was happily surprised, much as I didn't want to be, that the 951 is working without issue. Sometimes, you'd really like a problem to be configuration of endemic software error, rather that specific to the hardware. Makes me worry that it's something that won't be fixable in software, or that will never be fixed.
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri Jun 29, 2012 6:38 pm

Here's the steps that will reliably spin up the flash:

Using my config (or any other it seems) do the following:

On a computer on the WIFI AP load up high-bandwidth, multi-stream traffic (I use debian CD ISO torrents). Once it's running, snmpwalk the router. About halfway through (right before it checks the disk, I suspect), the flash process will go to 100%, the management sessions will freeze, the snmp query will timeout, and the router will remain pegged until the traffic is stopped, at which point it will go back to normal.

(updated to ticket # 2012062266000481)
 
Beone
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Re: RB751U-2Hn frequent (daily) reboots

Sat Jun 30, 2012 7:07 pm

Great, we run snmp on our CPE's every 5 minutes :D
 
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jhheider
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Re: RB751U-2Hn frequent (daily) reboots

Sun Jul 01, 2012 2:46 am

Yup. Hence the enormous problem that this bug causes. Even with SNMP disabled, it's possible to flood this router, but this is a simple trigger that works basically every time. The 951 seems like a great replacement, since it doesn't suffer from *this* bug in any way, but the wireless does disappear every few hours, until you reboot or re-enable the (enabled) wireless interface. MT support has confirmed this bug has been reported by multiple sources, and they're currently working on it.
 
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Re: RB751U-2Hn frequent (daily) reboots

Thu Jul 12, 2012 10:51 pm

The 951 seems like a great replacement, since it doesn't suffer from *this* bug in any way, but the wireless does disappear every few hours, until you reboot or re-enable the (enabled) wireless interface. MT support has confirmed this bug has been reported by multiple sources, and they're currently working on it.
True enough about the the wifi disappearing. I have booted up all my RBs today morning and in the evening when I got home the 951 wifi was gone. The disable/enable trick worked, but that's not the way to go. Any idea hos is this case progressing with the Support?
 
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jhheider
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Re: RB751U-2Hn frequent (daily) reboots

Thu Jul 12, 2012 10:54 pm

5.19rc1 doesn't seem to have this problem. I've had one reboot for no obvious reason since loading it last night, but no other issues (yet).

Time will tell...
 
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jhheider
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Re: RB751U-2Hn frequent (daily) reboots

Wed Jul 18, 2012 11:05 pm

No change to rb751U-2Hn 100% flash utilization with 5.19.

Ticket #2012062266000481
 
pljubas
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jul 23, 2012 10:53 pm

No change to rb751U-2Hn 100% flash utilization with 5.19.

Ticket #2012062266000481
Yes, I'm with same problem on rb751U, flash utilization goes up to the max, router gets unstable, no winbox access and, if I'm lucky, I can telnet to it and reboot it.
Works ok until some load occurs, then it "flashes" again.

Ticket #2012072366000405

I can't believe that after so many people had the similar issues that there is still no anwser why it happens?
Or, it is simply hardware issue on rb751U that software upgrade can't save...

BR, Petar
 
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jhheider
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jul 23, 2012 11:02 pm

Petar,

The RB751U-2Hn has not had one single stable firmware release since the hardware went on sale. The RB951-2n, while it had the disappearing radio problem in 5.18 (haven't tested 5.19 yet, but 5.19rc1 looked good in limited testing), hasn't had a single stability or load problem for me. I'm sad about the 751. If it were hardware, I feel like a recall would be cheaper for MT than the continued erosion of their reputation that comes from the more poorly executed additions to their product line.

That said, I'm willing to keep trying new firmware on the 751s, in the hopes that one will fix them. But it's been 8 months since I've reported my first 751 bug to MT, and they just haven't been able to make it work even as reliably as cheap SOHO gear.
 
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Re: RB751U-2Hn frequent (daily) reboots

Tue Jul 24, 2012 9:06 am

But it's been 8 months since I've reported my first 751 bug to MT, and they just haven't been able to make it work even as reliably as cheap SOHO gear.
+1 and I really admire your patience with this, I gave up this device months ago already.
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Aug 01, 2012 8:12 am

RB751U-2HnD - downgraded from 6.0 b3 tyo ROS 5.19 - 3-5 reboots per day.
[Ticket#2012080166000114] RE: RB751U-2HnD - Reboot
sorry for my english
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Aug 05, 2012 4:22 pm

Ive got about 30 of em... In process of collecting them and sending them back. Worthless device. Pretty much dont work right unless you are within 20 feet of if. Have tried everything short of putting an external antenna on them (Not doing that, shouldnt have to). Even the 2 I have at my house are just quirky.
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 6:31 am

is this a joke? the problem was reported on Nov 2011 and now it's already 1 year and still not fixed? How can we (system integrator) rely on this product with such bad support? This is a major issue that is a deal breaker for this router. If support is unable to fix it, the company should have recalled the product. How can we trust Mikrotik anymore? We have bought over 100 pcs to be implement and now we have to put the project on hold. We have already spend resources buying and implemented the devices on various locations. Now we need to recall them or something and that cost us double of our costs. MT was a very promising company but having this kind of support really set the reputation back few years behind others.
 
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normis
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 7:30 am

is this a joke? the problem was reported on Nov 2011 and now it's already 1 year and still not fixed? How can we (system integrator) rely on this product with such bad support? This is a major issue that is a deal breaker for this router. If support is unable to fix it, the company should have recalled the product. How can we trust Mikrotik anymore? We have bought over 100 pcs to be implement and now we have to put the project on hold. We have already spend resources buying and implemented the devices on various locations. Now we need to recall them or something and that cost us double of our costs. MT was a very promising company but having this kind of support really set the reputation back few years behind others.

Please clarify which issue you mean. Most of the above reports are very vague and generic. "disappointing range" is not a specific issue, especially for a SOHO (small office, home office) type of device. What range were you expecting? Most phones and laptops can't get 50m with a clear line of sight, no matter which AP you use.
No answer to your question? How to write posts
 
abubin
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 11:07 am

is this a joke? the problem was reported on Nov 2011 and now it's already 1 year and still not fixed? How can we (system integrator) rely on this product with such bad support? This is a major issue that is a deal breaker for this router. If support is unable to fix it, the company should have recalled the product. How can we trust Mikrotik anymore? We have bought over 100 pcs to be implement and now we have to put the project on hold. We have already spend resources buying and implemented the devices on various locations. Now we need to recall them or something and that cost us double of our costs. MT was a very promising company but having this kind of support really set the reputation back few years behind others.

Please clarify which issue you mean. Most of the above reports are very vague and generic. "disappointing range" is not a specific issue, especially for a SOHO (small office, home office) type of device. What range were you expecting? Most phones and laptops can't get 50m with a clear line of sight, no matter which AP you use.
What are you talking about "disappointing range"? Which part of my post have this 2 word?

The title of this thread is "RB751U-2Hn frequent (daily) reboots". What else do you think I am talking about? Isn't the 2 pages of discussion here all referring to this issue? FYI, we just upgraded to your STABLE firmware 5.22. Instantly the reboot issue happened. Even without much load, reboot automatically by itself. Have since downgraded to 5.17. Seems to be more stable. But not holding any high hope as we still need to do load tests and so on. Feels like a beta tester now...
 
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normis
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 11:46 am

You can see that the topic is very old, and most of the issues were solved before RouterOS v5.15. In newer posts, people complain about range.

Did you contact support? Please tell me your ticket number, and I will check the progress of this issue. If you have not contacted support, we can't help you. We must see the supout.rif file to be able to find the problem. We have currently no known issues that causes reboot of RB751
No answer to your question? How to write posts
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 12:21 pm

Here's the steps that will reliably spin up the flash:

Using my config (or any other it seems) do the following:

On a computer on the WIFI AP load up high-bandwidth, multi-stream traffic (I use debian CD ISO torrents). Once it's running, snmpwalk the router. About halfway through (right before it checks the disk, I suspect), the flash process will go to 100%, the management sessions will freeze, the snmp query will timeout, and the router will remain pegged until the traffic is stopped, at which point it will go back to normal.

(updated to ticket # 2012062266000481)
This is the exact issue we are seeing on RB751U, RB750UP, RB750GL and RB2011. If we swap them out with a PPC router e.g. RB1200 the problem goes away completely.
http://thebrotherswisp.com/ | Mikrotik MTCNA, MTCRE, MTCINE | Fortinet FTCNA, FCNSP, FCT | Extreme Networks ENA
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 1:20 pm

Here's the steps that will reliably spin up the flash:

Using my config (or any other it seems) do the following:

On a computer on the WIFI AP load up high-bandwidth, multi-stream traffic (I use debian CD ISO torrents). Once it's running, snmpwalk the router. About halfway through (right before it checks the disk, I suspect), the flash process will go to 100%, the management sessions will freeze, the snmp query will timeout, and the router will remain pegged until the traffic is stopped, at which point it will go back to normal.

(updated to ticket # 2012062266000481)
This is the exact issue we are seeing on RB751U, RB750UP, RB750GL and RB2011. If we swap them out with a PPC router e.g. RB1200 the problem goes away completely.
Ok you both. I did the test as described, and had no issues. Please tell me what I did wrong:
No answer to your question? How to write posts
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Dec 10, 2012 9:06 pm


Ok you both. I did the test as described, and had no issues. Please tell me what I did wrong:
Hi Normis.

For us this only happens after 3days to a week of the router being up and under heavy use.
Generally it is triggered by The Dude polling the mipsbe router.
I will set up a lab and replicate this and post supout.rif and video.
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Re: RB751U-2Hn frequent (daily) reboots

Wed Dec 12, 2012 3:45 pm

After 4-6 days of intense outgoing torrent traffic on the radio interface to reload the router. Supout.rif file I sent.
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RB751U-2HnD, RB2011LS, RB1100AH, RB433, RB411GL, RBSXT, CCR1016
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Dec 12, 2012 4:08 pm

i guess heavy p2p wasn't good for routers w/o FPU.
and otherwise stressful cases.
moderate overclocking[before replace to 1200] orimproving heatsink/cooler could ease it a bit.
also 64Mb and 128Mb is quite small for routers with significant portions of traffic with p2p and/or HUGE bandwith[recently become usual for most providers/customers datalinks].
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Dec 12, 2012 6:48 pm

I assume that the reboot on watchdog is due to the strong CPU load. For some reason the torrent traffic arriving via the radio interface causes severe loading process - "flash". Turning off the radio interface solves the problem.
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RB751U-2HnD, RB2011LS, RB1100AH, RB433, RB411GL, RBSXT, CCR1016
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed Dec 12, 2012 7:48 pm

This has always seemed to be the problem. My original tickets are all still outstanding, but I've stopped trying to use RB751 for SOHO. The 951 was an improvement, in that it wouldn't crash/reboot, but I've since moved away to an RB2011 in front of a cluster of Ubiquiti UniFi.

I love RouterOS, but I don't think Routerboards provide a viable WiFi AP solution. Unsurprising, I suppose, due to their evolution from CPE. What I *haven't* tried is a 2011 with wireless, but it just wasn't worth it to me to keep messing with it.
 
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Re: RB751U-2Hn frequent (daily) reboots

Thu Dec 13, 2012 10:05 am

I can send simple L2TP Server+NAT config to confirm that every RB750, RB750UP, RB750GL, RB751U, RB751G will reboot if run btest on two PC (endpoints). Interestingly this not happens on ROS 4.17, but only on 5.x. Sadly only RB750 supported by ROS 4.17, thus all other RB unusable under high loads, because of random reboots.

In your test Normis CPU load rerely hops over 50% (maybe once, but it can be login via winbox from other PC).
Here's the steps that will reliably spin up the flash:

Using my config (or any other it seems) do the following:

On a computer on the WIFI AP load up high-bandwidth, multi-stream traffic (I use debian CD ISO torrents). Once it's running, snmpwalk the router. About halfway through (right before it checks the disk, I suspect), the flash process will go to 100%, the management sessions will freeze, the snmp query will timeout, and the router will remain pegged until the traffic is stopped, at which point it will go back to normal.

(updated to ticket # 2012062266000481)
This is the exact issue we are seeing on RB751U, RB750UP, RB750GL and RB2011. If we swap them out with a PPC router e.g. RB1200 the problem goes away completely.
Ok you both. I did the test as described, and had no issues. Please tell me what I did wrong:
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri Jan 25, 2013 8:44 am

In my case the problem was solved installing the firmware 6.0 RC6
RB751U-2HnD, RB2011LS, RB1100AH, RB433, RB411GL, RBSXT, CCR1016
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Apr 21, 2013 2:13 am

In my case the problem was solved installing the firmware 6.0 RC6
Interesting. I have some of this random reboots on my router weekly. This problems starts ( i believe ) when I upgrade my router to the 5.24 version. With the original 5.16 version i isn't have this problems.

Interesting to see about this problem. I send an email to Mikrotik and they say i need to send the routerboard to the warranty ... but reading this i believe this isn't solve my problem.

Well, i changing the encryption of my network to AES ( as I read on the first page ) and I will test on the next days.
My RBs: RB751U-2HnD, RB951G-2Hnd , RB750-GL
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Apr 21, 2013 7:20 pm

Hi all again, my setup, 14db it not priorities for best stability, it`s just my choice :D , but rate selection played a major role, and security profile in wireless section.
Intesting, are you still using this config on your routerboard @Turb0 ?
My RBs: RB751U-2HnD, RB951G-2Hnd , RB750-GL
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Apr 28, 2013 11:43 pm

Here, on my routerboard I believe my problems is with a pendrive on my usb.

When I remove the pendrive ( i have one filesystem on this pendrive to write my logs ) my routerboard is more stable.

Too I made the configs of @Turb0 .

I will wait one or two weeks, but I believe this solves my problem.

I am on RouterOS 5.22 and firmware 2.41 .
My RBs: RB751U-2HnD, RB951G-2Hnd , RB750-GL
 
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Re: RB751U-2Hn frequent (daily) reboots

Wed May 29, 2013 10:58 am

I have also problems with strange restarts by watchdog for some time, I try to connect to the event and it happens most often when talking on Skype - even one person in the network. Upgrade to version 6.0 caused a marked decrease of such events, but not a total elimination.
751U-2HnD ROS 6.0 rb fw 3.07, acting as a home NAT router
 
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Re: RB751U-2Hn frequent (daily) reboots

Fri May 31, 2013 6:11 pm

I have also problems with strange restarts by watchdog for some time, I try to connect to the event and it happens most often when talking on Skype - even one person in the network. Upgrade to version 6.0 caused a marked decrease of such events, but not a total elimination.
751U-2HnD ROS 6.0 rb fw 3.07, acting as a home NAT router
You try this configurations ?

http://forum.mikrotik.com/viewtopic.php ... 26#p303575
My RBs: RB751U-2HnD, RB951G-2Hnd , RB750-GL
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Jun 02, 2013 1:29 am

You try this configurations ?
Yep, I'm observing this topic from the beginning, but my wifi config was set just before... As I wrote, now resets occur less frequently (literally one since the release version 6).
 
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Re: RB751U-2Hn frequent (daily) reboots

Mon Jun 03, 2013 2:20 am

You try this configurations ?
Yep, I'm observing this topic from the beginning, but my wifi config was set just before... As I wrote, now resets occur less frequently (literally one since the release version 6).
Here with this configs my router was online without reboots for 20 or more.

It was a Nat router and I have 2 vpns and a 6to4 tunnel too :-)


Sent from my GT-I9100 using Tapatalk 2
My RBs: RB751U-2HnD, RB951G-2Hnd , RB750-GL
 
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Re: RB751U-2Hn frequent (daily) reboots

Sun Sep 08, 2013 3:19 pm

Installation of ROS 6.1 (and higher) with an upgrade included RouterBOOT ended my problems (I hope).

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