IP Blocking / Port Restrictions
For someone not from a networking background, can someone help me with a query I have about IP BLocking on the Listener port?
I have read the best practices for securing Oracle, which state it is best practice to specify a list of allowed ip addresses that can connect to the port which the oracle listener is listening on - and deny access from untrusted clients. I get the logic behind that. I am also aware Oracle itself doesnt do the port blocking, a firewall does. But which firewall typically will do this IP Blocking? Are we talking a firewall installed on the Database Server, or some sort of permiter firewall that can also prevent connections to specific Servers such as an Oracle Database Server? Excuse my ignorance on Firewalls.