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Mikrotik UDP port 5678 usage is for MikroTik Neighbor Discovery Protocol (MNDP)

Posted by jpluimers on 2017/08/14

Just in case you see UDP port 5678 in the firewall log of your MikroTik device: it’s usage of the MikroTik Neighbor Discovery Protocol (MNDP) [WayBack] protocol.

You can either block Neighbour Discovery [WayBack] in the firewall or turn it off on the MikroTik Services [WayBack] or inspect any of these protocols:

Proto/Port Description
20/tcp FTP data connection
21/tcp FTP control connection
22/tcp Secure Shell (SSH) remote Login protocol
23/tcp Telnet protocol
67/udp Bootstrap protocol or DHCP Server
68/udp Bootstrap protocol or DHCP Client
80/tcp World Wide Web HTTP
123/udp Network Time Protocol ( NTP)
161/udp Simple Network Management Protocol (SNMP)
179/tcp Border Gateway Protocol ( BGP)
443/tcp Secure Socket Layer (SSL) encrypted HTTP
500/udp Internet Key Exchange (IKE) protocol
RIP routing protocol
646/tcp LDP transport session
646/udp LDP hello protocol
1080/tcp SOCKS proxy protocol
1698/udp 1699/udp RSVP TE Tunnels
1701/udp Layer 2 Tunnel Protocol ( L2TP)
1723/tcp Point-To-Point Tunneling Protocol ( PPTP)
Universal Plug and Play ( uPnP)
1966/udp MME originator message traffic
1966/tcp MME gateway protocol
2000/tcp Bandwidth test server
5246,5247/udp CAPsMan
5678/udp Mikrotik Neighbor Discovery Protocol
6343/tcp Default OpenFlow port
8080/tcp HTTP Web Proxy
8291/tcp Winbox
8728/tcp API
8729/tcp API-SSL
20561/udp MAC winbox
/2 Multicast | IGMP
/4 IPIP encapsulation
/41 IPv6 (encapsulation)
/46 RSVP TE tunnels
/47 General Routing Encapsulation (GRE) – used for PPTP and EoIP tunnels
/50 Encapsulating Security Payload for IPv4 (ESP)
/51 Authentication Header for IPv4 (AH)
/89 OSPF routing protocol
/103 Multicast | PIM
/112 VRRP


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