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By default, a CDN node uses IP addresses to connect to another nodes and does not resolves their names to IPs

cdn_nodes_resolve_ip=false

Nodes name resolution to IP addresses may be enabled if needed

cdn_nodes_resolve_ip=true

In this case:

a CDN node will always try to get a name of another node by address and to get addrees by name
CDN nodes names will be used to establish signaling connections and to display nodes statistics

The cdn_nodes_resolve_ip parameter value must be the same for all the CDN nodes.

On every CDN node, a reverse DNS lookup must return the same another node name as forward DNS lookup for the node address if cdn_nodes_resolve_ip=true is enabled. For example, if the name edge.mycooldomain.com is resolved to 10.0.0.1, but this address reverse DNS lookup returns 1.0.0.10-vm-at-hosting-provider.anothercooldomain.com, then all the requests to establish a WebRTC connection from this node will be rejected.