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Ethernet Interfaces
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General Information

Summary

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

Specifications

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

Additional Resources

Ethernet Interface Configuration

Submenu level: /interface ethernet

Property Description

arp (disabled | enabled | proxy-arp | reply-only; default: enabled) - Address Resolution Protocolauto-negotiation (yes | no; default: yes) - when enabled, the interface "advertises" its maximum capabilities to achieve the best connection possiblecable-setting (default | short | standard; default: default) - changes the cable length setting (only applicable to NS DP83815/6 cards)

default - suport long cables
short - support short cables
standard - same as default

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 notfull-duplex (yes | no; default: yes) - defines whether the transmission of data appears in two directions simultaneouslymac-address (MAC address) - set the Media Access Control number of the cardmdix-enable (yes | no) - whether the MDI/X auto crosscable correction feature is enabled for the port (if applicable)mtu (integer; default: 1500) - Maximum Transmission Unitname (name; default: etherN) - assigned interface name, whrere 'N' is the number of the ethernet interfacespeed (10 Mbps | 100 Mbps | 1 Gbps) - sets the data transmission speed of the interface. By default, this value is the maximal data rate supported by the interface

Command Description

blink (name) - blink the port's LEDs for about 10 seconds. Useful if you want to discover, which of the physical Ethernet ports is named as specifiedreset-mac (name) - set the MAC address of the NIC to the factory default setting

Notes

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.

Example

[admin@MikroTik] > interface print
Flags: X - disabled, D - dynamic, R - running
 #    NAME                                              TYPE             MTU
 0  X ether1                                            ether            1500
[admin@MikroTik] > interface enable ether1
[admin@MikroTik] > interface print
Flags: X - disabled, D - dynamic, R - running
 #    NAME                                              TYPE             MTU
 0  R ether1                                            ether            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=no auto-negotiation=yes full-duplex=yes 
      cable-settings=default mdix-enable=yes speed=100Mbps 
[admin@MikroTik] interface ethernet>

Monitoring the Interface Status

Command name: /interface ethernet monitor

Property Description

auto-negotiation (done | incomplete) - fast link pulses (FLP) to the adjacent link station to negotiate the SPEED and MODE of the link. Both stations choose the maximal speed boh support.

done - negotiation done
incomplete - negotiation failed

default-cable-setting (read-only: short | standard) - default cable length setting (only applicable to NS DP83815/6 cards)

short - support short cables
standard - same as default

full-duplex (yes | no) - whether transmission of data occurs in two directions simultaneouslyrate (10 Mbps | 100 Mbps | 1 Gbps) - the actual data rate of the connectionstatus (link-ok | no-link | unknown) - status of the interface, one of the:

link-ok - the card is connected to the network
no-link - the card is not connected to the network (cable is not plugged in or faulty)
unknown - the connection is not recognized (if the card does not report connection status)

Example

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

Troubleshooting

Description

  • Interface monitor shows wrong information

    In some very rare cases it is possible that the device driver does not show correct information, but it does not affect the NIC's performance (of course, if your card is not broken)

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