Hi,

i use since 4 weeks two RB750 RouterBoards and i have a big problem.
Every night(!) the RB750 makes problem. All requests from internet over port 80 not working. Sometimes at 3:00 am, sometime 5:00 am, sometimes at 18:00pm. I have no idea why. I use 4 of 5 etherports. On ether5 is a switch, if i unpluggd the powerline from switch and reconnect this, the RB750 runs for few hours. I have try with 3 switchs from diffrent manufactures. I have tried with other RouterOS-Versions (original 4.90, 4.16, 4.17, 5.00rc11).

The CPU-Usage is between 0% and 30%. I can access from my workstation and laptop to the internet, no problem. But from internet to my server over ether2 and ether3 no access. I can see in Winbox/Firewall/Rules the requests comes, but not to my server.

ether1: Telecom-DSL (ADSL) for private surfing
ether2: SDSL with 4 fixed IPs
ether3: SDSL with 16 fixed IPs
ether4: unused
ether5: go to switch and then to all clients/server

I have no idea why stop the working with my switch after few hours, but i can normal surf in internet from my clients. And all LEDs are on.
Is this a hardware problem? Must i buy the RB1100 with more RAM, CPU and Diskspace?

Is this correct the Atheros-Chip in RB750 have no passiv-cooler? I have found pictures in internet with opened RB750 that have a cooler, but in my both RB750 i have no cooler. I have check the temperatur in the chip, 37-39 Grad Celcius. Is this ok?

I hope everyone have a idea - it is very angry. I have use in the last 7 years a pentium3 with RouterOS 2.8.5 and never i have this problems. Only since i use the RB750, i must every night disconnect my switch. The first solution was i have buyed two other switches, one unmanaged and one managed. But have not helped. I think is not a problem with the switches. I think the RB750 makes problems. I can try by next problem to disconnect only the ether5 without unplug powerline from switch.

HELP PLEASE!!!!

Best regards
Andy

Edit: The Switch has hangs. I have tried to disconnect the LAN-Cable only on ether5 but have not helped. Only if i disconnect the powerline from switch an reconnect helps. But i can not have three switches from diffrent manufactures with bugs/mistakes. And one of the switch have runs 7 years with mikrotik 2.8.5 on pentium cpu. Since RB750 i have only problems with switch.

Can this help you?
Serialnumber: 25BC01849755/025 with AR7240

Best regards
Andy

Hi,

I had some issue with my RB750G's ports. Try to remove the switch configuration from the device (remove Master port settings). It helped for me.

regards,

Hi,

I had some issue with my RB750G's ports. Try to remove the switch configuration from the device (remove Master port settings). It helped for me.

regards,

Hi,

do mean the "Master Port"-Settings in Interface List?
I have for all five ports no master port settings (Value is none in column "Master Port")
But i have found in winbox under "Switch" and "Port" 4 entrys for ether2-5 with the value "fallback".
Can this make problems? I have set to disable. Saturday/Sonday i can say more.

Thank you
regards
Andy

And the switch have stop the work
After restart the switch the traffic is okay.

I have today buy a x86 for 50 Euro and i install my good old RouterOS 2.8.5.
I'm search since 4 weeks, the support have no solutions and response not on my ticket.

Andy

I have buy RB1100 and the same problem
Externel Switch stops the work after 17 hours.
I believe is not a hardware problem, testet with two RB750 and one RB1100.
But what can stop the routing from fixed IP Port 80 to Private IP?
And why after reset the external switch the router works fine?
I have no idea.

Andy