LAN Traffic Passing To MT!!

RouterOS Beginner Basics
1

Hello!

I setup a diskless server(pxe server). All clients and server is connected directly to a dumb switch at same subnet. Mikrotik handles the dhcp/gateway. Now, I want to route LAN traffic from client to switch to server directly. The problem is that the traffic from
PC01 → Dumb switch → to Mikrotik ether2 interface then on my bridge then out to eth2 → switch again then to → Server.
Maybe the traffic is passing to cpu since I see cpu spiking to 25%. Also I see traffic going to my simple queues. I tried to disable all mangle and queues but traffic is still passing to mikrotik. What should I do to prevent this from happening.
Sorry for my english.

WAN → Mikrotik Hex GR3 → 16PORT unmanaged Gbe switch connected to Hex eth2 port.

2

hi ho,

as you can see here
https://mikrotik.com/product/RB750Gr3#fndtn-specifications
your device has a MT7621A CPU inside.

The feature you are searching for is “hardware offloading”.
So the traffic is switched in switch-chip and doesnt go through the cpu.

here you can see what hardware-offloading-features are supported by your CPU:
https://wiki.mikrotik.com/wiki/Manual:Interface/Bridge#Bridge_Hardware_Offloading

3

So your router is connected to switch with single ethernet cable, connected to ether2? Unless PC01 and Server are in different subnets (and RB has two IP addresses set on ether2/bridge) this definitely should not happen. If it does, it’s due to mis-configuration on either PC01 or Server or both. Otherwise the dumb switch should pass traffic between PC01 and Server directly without bothering router.

4

I let my diskless server handle the dhcp and I also enabled the HW Offload and it works okay now. Thanks for the reply!