Want to know what port a machine is connected to on a Mikrotik RouterOS device? Do you need to disable it and enable it to force DHCP renewal? Read on.
Finding the MAC address
There are two ways to do this.
- If you are using a DHCP server on this router, then you can use
/ip dhcp-server lease print - If it’s just a switch, then you can try using the ARP table instead:
/ip arp print
Once you have the MAC address, go see what port it’s connected to. There may be multiple MACs per port if there’s a downstream switch, or in my case a Hyper-V host with a virtual switch.
Finding the switch port by MAC address
/interface ethernet switch host print will show all of the devices on the network by MAC address, along with the port they’re connected to. This is very similar to the show mac address-table command on Cisco Catalyst switches.
[admin@MikroTik] /interface ethernet> /interface ethernet switch host print
Flags: D - dynamic, I - invalid
# SWITCH MAC-ADDRESS PORTS TIMEOUT DROP MIRROR VLAN-ID
0 D switch1 B8:27:EB:28:6B:24 ether4 2m22s 1
1 D switch1 00:0E:8F:84:3E:3A ether2-master 2m25s 1
2 D switch1 E8:40:F2:06:25:A8 ether4 2m29s 1
22 D switch1 00:15:5D:01:62:00 ether5 2m29s 1
23 D switch1 00:1B:21:6A:92:AE ether5 2m25s 1
Toggling the switch port
If 00:1B:21:6A:92:AE is what you were looking for, then you can cycle that port by disabling it, then enabling it:
set ether5 disabled=yesset ether5 disabled=no