Port 521 · RIPng

Port 521 is RIPng, UDP.

RIP next generation — the RIP distance-vector routing protocol adapted for IPv6. Routers exchange updates over multicast address ff02::9.

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-521 protocol udp port 521

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application rip service udp-521 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 :521
• nmap nmap -sU -p 521 <host>

Related ports

• 520 RIP
• 179 BGP
• 546 DHCPv6 Client
• 547 DHCPv6 Server

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