> Ce se intimpla cind dau reject la reguli pe udp?
> 
> iptables -A INPUT -p udp -dport 138 -j REJECT

compul respectiv va genera un ICMP port unreachable si-l va trimite
ip-ului de la care a venit pachetul..

 
REJECT

    This module has the same effect as `DROP', except that the sender
is sent an ICMP `port unreachable' error message. Note that the ICMP
error message is not sent if (see RFC 1122):

        * The packet being filtered was an ICMP error message in the
first place, or some unknown ICMP type.
        * The packet being filtered was a non-head fragment.
        * We've sent too many ICMP error messages to that destination recently.

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