April 13, 2021

Firewall: IP based or Port based?

If I am to block outgoing connections in a server firewall, should it be better done with IP or port? If I understand this correctly, we use IP addresses, we would need to create a whitelist of IPs (from/to) that is connected but that I think that would become complicated quickly without central administration. If use ports, how to decide upon random (source) ports as they can be anything for given connection.

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