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| 53 | udp |
| 53 | tcp |
| 443 | tcp |
Anycast and OSPF
An on-prem A host hardware device or virtual machine appliance can use the OSPF routing protocol to advertise routes for DNS anycast addresses to an upstream router within the autonomous system. The upstream router uses the OSPF advertisement to determine the nearest DNS server from a group of servers within the internetwork. In practice, the NIOS appliance relies upon OSPF to determine the best route for DNS queries to take to the nearest DNS server. The upstream router then forwards the query to the chosen DNS server.
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For additional information on Anycast, see the following:
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