Ethernet Interfaces

Document revision:1.2 (Fri Apr 16 12:35:37 GMT 2004)
Applies to: V2.8

General Information


MikroTik RouterOS supports various types of Ethernet Interfaces. The complete list of supported Ethernet NICs can be found in the Device Driver List.


Packages required: system
License required: Level1
Submenu level: /interface ethernet
Standards and Technologies: IEEE 802.3
Hardware usage: Not significant

Related Documents

Additional Resources

Ethernet Interface Configuration

Submenu level: /interface ethernet

Property Description

name (name; default: etherN) - assigned interface name, whrere 'N' is the number of the ethernet interface

arp (disabled | enabled | proxy-arp | reply-only; default: enabled) - Address Resolution Protocol

mtu (integer; default: 1500) - Maximum Transmission Unit

disable-running-check (yes | no; default: yes) - disable running check. If this value is set to 'no', the router automatically detects whether the NIC is connected with a device in the network or not

mac-address (read-only: MAC address) - Media Access Control address of the card

auto-negotiation (yes | no; default: yes) - when enabled, the interface "advertises" its maximum capabilities to achieve the best connection possible

full-duplex (yes | no; default: yes) - defines whether the transmission of data appears in two directions simultaneously

long-cable (yes | no; default: no) - changes the cable length setting (only applicable to NS DP83815/6 cards). For cable lengths of more than 50m, set "long-cable=yes"

speed (10 Mbps | 100 Mbps | 1000 Mbps) - sets the data transmission speed of the interface. By default, this value is the maximal data rate supported by the interface


For some Ethernet NICs it is possible to blink the LEDs for 10s. Type /interface ethernet blink ether1 and watch the NICs to see the one which has blinking LEDs.

When disable-running-check is set to no, the router automatically detects whether the NIC is connected to a device in the network or not. When the remote device is not connected (the leds are not blinking), the route which is set on the specific interface, becomes invalid.


[admin@MikroTik] > interface print
Flags: X - disabled, D - dynamic, R - running
 #    NAME                         TYPE             RX-RATE    TX-RATE    MTU
 0  X ether1                       ether            0          0          1500
[admin@MikroTik] > interface enable ether1
[admin@MikroTik] > interface print
Flags: X - disabled, D - dynamic, R - running
 #    NAME                         TYPE             RX-RATE    TX-RATE    MTU
 0  R ether1                       ether            0          0          1500
[admin@MikroTik] > interface ethernet
[admin@MikroTik] interface ethernet> print
Flags: X - disabled, R - running
 #    NAME                                   MTU   MAC-ADDRESS       ARP
 0  R ether1                                 1500  00:0C:42:03:00:F2 enabled
[admin@MikroTik] interface ethernet> print detail
Flags: X - disabled, R - running
 0  R name="ether1" mtu=1500 mac-address=00:0C:42:03:00:F2 arp=enabled
      disable-running-check=yes auto-negotiation=yes full-duplex=yes
      long-cable=no speed=100Mbps
[admin@MikroTik] interface ethernet>

Monitoring the Interface Status

Command name: /interface ethernet monitor

Property Description

status (link-ok | no-link | unknown) - status of the interface, one of the:
link-ok - the card has connected to the network
no-link - the card has not connected to the network
unknown - the connection is not recognized

rate (10 Mbps | 100 Mbps | 1000 Mbps) - the actual data rate of the connection

auto-negotiation (done | incomplete) - fast link pulses (FLP) to the adjacent link station to negotiate the SPEED and MODE of the link
done - negotiation done
incomplete - negotiation failed

full-duplex (yes | no) - whether transmission of data occurs in two directions simultaneously


See the IP Addresses and ARP section of the manual for information how to add IP addresses to the interfaces.


[admin@MikroTik] interface ethernet> monitor ether1,ether2
              status: link-ok link-ok
    auto-negotiation: done    done
                rate: 100Mbps 100Mbps
         full-duplex: yes     yes