| Port No | 9 |
| Service Name | discard |
| RFC Doc | 0 |
| Protocol | UDP |
| Description | discard is essentially a data sink, any data sent to the discard port is simply discarded, this was historically used for testing network links |
| Reference Link | Port No:9 And Service Name:discard Of Protocol:UDP |
| Attack | Firewalling recommendations: Firewall port 9 both inbound and outbound, this is a historical service that is potentially dangerous Attack detection: Most traffic to and from port 9 can be classified as hostile |
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