Port 4789 · VXLAN

Port 4789 is VXLAN, UDP.

Virtual Extensible LAN — overlay network encapsulation used by Docker, Kubernetes (Flannel, Calico), and EVPN fabrics.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service udp-4789 protocol udp port 4789

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application vxlan service udp-4789 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -ulnp | grep :4789
• nmap nmap -sU -p 4789 <host>

Related ports

• 2379 etcd Client
• 2380 etcd Peer
• 6443 Kubernetes API Server
• 22 SSH
• 500 IKE / ISAKMP
• 1080 SOCKS Proxy

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