Difference between REJECT and DROP in iptables

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What’s the difference of using the REJECT or DROP in the configuration of iptables?

linux iptables

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Basically it works like this, when used the DROP received package is barred in silent mode(Stealth), that is to say, nothingness is returned to sender. Particularly when I need to bar packets on ports I prefer to use this rule, because in a possible attack, nothing is returned.

Already the REJECT, the package is barred as well as in DROP, but an answer is returned stating the error(UDP package returns an ICMP type 3, if TCP will be of type TCP reset).

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