Port 6081 (Geneve)

Generic Network Virtualization Encapsulation, used by OVN, Cilium and AWS Gateway Load Balancer.

Registered (user) port, 1024-49151 UDP Containers and Kubernetes Do not expose to the internet

Port 6081 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

What port 6081 is used for

Generic Network Virtualization Encapsulation, used by OVN, Cilium and AWS Gateway Load Balancer.

Do not expose to the internet. Node-to-node only.

Service nameProtoDescriptionAssigneeReference

geneve UDP Generic Network Virtualization Encapsulation (Geneve) IESG RFC 8926

Registry dates for this port: registered 2014-03-27, last modified 2020-05-04.

Linux: UDP 6081

sudo ss -ulnp 'sport = :6081'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6081

Windows (Command Prompt)

netstat -ano | findstr :6081

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 6081

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 6081

ufw

sudo ufw deny 6081/udp

iptables

sudo iptables -A INPUT -p udp --dport 6081 -j DROP

nftables

sudo nft add rule inet filter input udp dport 6081 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 6081' -Direction Inbound -Protocol UDP -LocalPort 6081 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.