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안녕하세요. 초보어드민입니다. 다름이 아니오라 portsentry를 설치해서 확인해 본 결과 이렇게 나오더군요 [root@test/root]# grep portsentry /var/log/messages Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: UDP scan from host: 211.58.253.131/211.58.253.131 to UDP port: 161 Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: Host 211.58.253.131 has been blocked via wrappers with string: "ALL: 211.58.253." Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: UDP scan from host: 211.58.253.131/211.58.253.131 to UDP port: 161 Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: Host: 211.58.253.131/211.58.253.131 is already blocked Ignoring Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: UDP scan from host: 211.58.253.131/211.58.253.131 to UDP port: 161 Mar 13 01:44:49 ad7 portsentry[5948]: attackalert: Host: 211.58.253.131/211.58.253.131 is already blocked Ignoring Mar 13 06:49:37 ad7 portsentry[5936]: attackalert: SYN/Normal scan from host: islandsuncom.net/208.63.44.69 to TCP port: 111 Mar 13 06:49:37 ad7 portsentry[5936]: attackalert: Host 208.63.44.69 has been blocked via wrappers with string: "ALL: 208.63.44.69" [root@test/root]# cat portsentry.history 984388448 - 03/12/2001 18:14:08 Host: 203.245.15.3/203.245.15.3 Port: 31337 UDP Blocked 984415489 - 03/13/2001 01:44:49 Host: 211.58.253.131/211.58.253.131 Port: 161 UDP Blocked 984433777 - 03/13/2001 06:49:37 Host: islandsuncom.net/208.63.44.69 Port: 111 TCP Blocked 일단 /etc/services 포트를 막았습니다. #snmp 161/udp #sunrpc 111/tcp portmapper # RPC 4.0 portmapper TCP #sunrpc 111/udp portmapper # RPC 4.0 portmapper UDP 그리고 기본적으로 Tcp Wapper hosts.deny를 ALL:ALL로 설정했으니 ALL:211.58.253.131 ....이렇게 portsentry가 등록을 시켜놔도 아무런 효과가 없을 듯한데... 아님...고수님들이 아시는 특단(?)의 조치는 없을까요?--이 곳에 서명을 적어주십시오. 끝까지 읽어주셔서 감사합니다.^^
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