A target is the action taken if the configuration options match a IP packet.
It's a iptables concept.
|Name|| Rejection |
|default||Hardcoded value that is basically the same as REJECT (may eventually fallback to the INPUT chain)|
|ACCEPT||Accept all incoming packets except those disabled by a specific rule|
|REJECT||Yes||Reject all incoming packets except those accepted by a specific rule|
|DROP||No||Same as reject|