Is anyone else seeing this problem on the RB751U-2Hn? I’m currently up-to-date with 5.12/2.38 and still seeing nearly daily reboot, mostly occurring under heavy wireless load (particularly to the router). I’m not getting anything useful in the logging, other than a kernel failure. Ticket #2011121366000676 with MT (open for 49 days now), hasn’t produced any improvement. The overall layout is pretty trivial:
wireless bridged to lan (dhcp)
dmz (dhcp)
dhcp uplink
dns on the router
pptp client
simple filter/nat rules
8 simple queues
I haven’t had this issue with other hardware, so I do suspect something in the wireless driver for this board is at fault. Any ideas, anyone?
I’ve been running this one since 3 days after rOc-nOc got their first shipment. It wasn’t bad with 5.6, but recent versions have had this problem. 5.11 was the worst, 5.12 has been better, but far from perfect. I haven’t tried rolling back the firmware to what shipped with 5.6 (is this possible/easy without a serial port?), but I did netinstall 5.12 fresh with keep configuration, and am currently at 2d7h uptime (which is a recent record). So, perhaps it was a bad block in the kernel. Time will tell.
We use 5.6 on all our production systems at the moment, that’s the reason i’m running it.
You can downgrade easily without serial, just upload files via winbox, then go to /system/package in winbox and hit the Downgrade button.
EDIT: Just thought about it, I got one RB751 in the field running 5.11:
[xx@xx] > /system resource print
uptime: 1w4d7h51m50s
version: 5.11
free-memory: 12096KiB
total-memory: 29708KiB
cpu: MIPS 24Kc V7.4
cpu-count: 1
cpu-frequency: 400MHz
cpu-load: 1%
free-hdd-space: 30032KiB
total-hdd-space: 61440KiB
write-sect-since-reboot: 133790
write-sect-total: 304708
bad-blocks: 0%
architecture-name: mipsbe
board-name: RB751U-2HnD
platform: MikroTik
[xxx@xxx] >
I think I downloaded as far as 5.8 without seeing an improvement. I was more interested in downgrading the firmware, rather than the OS.
I had a reboot about 16 hours ago. Still leagues better than I’d been seeing, and seems to be more frequent when my iPad is downloading large binaries from apple.
Ok, some further news from my site. I also seem to see reboots on different locations now.
Strange thing is that we don’t see it on all of them.
We 've stopped upgrading our locations to RB751’s as we first want to know the cause of this issue.
We’re running 5.6, 5.12 seems to be a complete disaster on RB751U-2HnD.
Hi all
I have the same problem on my 751U, and i resolve him. I fix tx power to 14db and use “card rates” in wifi power.
Specific options will I be able to point out when I get home. Prior to their use RB751 rebooted several times a day
Hi all again, my setup, 14db it not priorities for best stability, it`s just my choice , but rate selection played a major role, and security profile in wireless section.
It definitely presents like a wifi driver issue. I’ve sent numerous supouts to support, and the last suggestion I got was trying 5.12rc1. So far, 5.13 seems to work. I haven’t seen this problem since my upgrade to it.
, but rate selection played a major role, and security profile in wireless section.
