Port 520 · RIP

Port 520 is RIP, UDP.

Routing Information Protocol v1/v2 — distance-vector routing for small networks. Largely replaced by OSPF and EIGRP.

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-520 protocol udp port 520

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application rip service udp-520 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 :520
• nmap nmap -sU -p 520 <host>

Related ports

• 521 RIPng
• 179 BGP

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