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Do you prefer filtered ports or closed ports on your firewall?
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It depends about the situation.
For small company servers or back-end systems or intranet sites I will choose to close ports (REJECT).
The reason for that is because those server are not usually targeted by DDoS attacks and also because the external apps that requires to consume services hosted in the the servers can quickly report failures instead to hang the connections during minutes.
For example, I faced a situation that one of my admins filtered a port (DROP) by mistake that was currently in use in a streaming server, and all the client video players were displaying the “Loading…” message during minutes. The reason was that video players were waiting for the server answer and they were configured with a high connection timeout. In this case I would like to reject the connections, because if this situation happens again at least external clients can display a quickly “Unable to connect” message.
If your server is used as website that can be targeted by a DDoS attacks then I will choose the “DROP” policy because in this way your firewall is not going to consume CPU and bandwidth answering about the state of the port (Sending back ICMP messages).
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