Does PostgreSQL listen_addresses='*' Dynamically Detect New Interfaces

[Stelios Malathouras <s.malathouras@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

We've scheduled for an IP change for one of our dedicated PostgreSQL servers, running on version 13.8.

Our local tests, with listen_addresses = '*',  show that the postgres listener accepts connections immediately to the new IP.

The same behavior is observed when adding a new network interface.  Postgres accepts connections to the new network interface (and IP) immediately without requiring a restart.

Is it safe to assume this is the default behaviour ? How does the instance detect new interfaces and their IP(s) and begin listening on them without needing a service reload or restart?  

Thanks,

Stelios