외부로부터 인바운드 되는 NetBIOS 패킷, 보안상 차단하여야 할 패킷의 차단 (SNMP, telnet,ftp, echo, daytime, chargen, finger, sunrpc)
7 TCP UDP Echo Protocol[10][11]
13 TCP UDP Daytime Protocol[17]
19 TCP UDP Character Generator Protocol (CHARGEN)[21]
21 TCP SCTP UDP File Transfer Protocol (FTP) control (command)[22][23][12][11]
23 TCP UDP Telnet protocol—unencrypted text communications[24][11]
79 TCP UDP Finger protocol
111 TCP UDP Open Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC)
137 TCP UDP NetBIOS Name Service, used for name registration and resolution[63][64] Official
138 TCP UDP NetBIOS Datagram Service[63][64][11] Official
139 TCP UDP NetBIOS Session Service[63][64]
161 TCP UDP Simple Network Management Protocol (SNMP)[
참고 : https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers