RB1200 and CPU 100%

[Pumpir]

I have RB1200, when rebooted, CPU is about 0-5%, after few hours it is permanently 100%, although RB is doing nothing (no users connected). Is there some way, how to find a reason? Thanks.

[zervan]

Go to Tools → Profile in WinBox to see which process is taking CPU.

[sonny]

Check rojterboard firmware and upgrade if possible.

[Pumpir]

Problem is with DHCP, it is using 85-95% CPU.
I have ether6 port as a WAN, ether7 port as LAN, on LAN port DHCP server is configured and ON. When I reboot RB, it is normal, when I enable LAN port (with DHCP server) within 1-60 minutes CPU is going to 85-95% and is keeping this CPU load even if there is no activity on the port.
Is there some bug?
There is the newest firmware 2.33.

[zervan]

@Pumpir

Problem is with DHCP, it is using 85-95% CPU.
I have ether6 port as a WAN, ether7 port as LAN, on LAN port DHCP server is configured and ON. When I reboot RB, it is normal, when I enable LAN port (with DHCP server) within 1-60 minutes CPU is going to 85-95% and is keeping this CPU load even if there is no activity on the port.
Is there some bug?

Maybe it is..

@in other thread Chupaka

I can confirm: as soon as you disable the interface used by dhcp-client, ‘dhcp’ process eats the whole CPU core until reboot

after disabling dhcp-client, CPU goes down, just not momentarily

http://forum.mikrotik.com/t/tx-power-settings-for-prism-are-back/89/1
But he is talking about DHCP Client, not Server and I don’t know which routerboard he is talking about. And I haven’t found any DHCP-related problems on my RB1200. I have DHCP Server active on switched ports (1-5) and on bridged ports 6+7. I don’t use DHCP Client, do you?

Try to contact support and let us know…

[Pumpir]

I don’t use DHCP client, but have fast answer from support:

v5.8 has this bug fixed, it’s caused by placing a DHCP server on an inactive interface. please wait until v5.8 is released.