ping 응답 없는 서버 nmap 포트 스캔

ping 응답 없는 서버 포트 스캔
ICMP 응답 없는 서버 포트 스캔

1 명령어[ | ]

Bash
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nmap 서버주소 -P0
nmap 서버주소 -Pn

2 실습[ | ]

Console
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[root@zetawiki ~]# ping google.com -W1 -c4
PING google.com (1.255.22.231) 56(84) bytes of data.

--- google.com ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3000ms
→ naver.com은 ping 응답을 하지 않는다.
Console
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[root@zetawiki ~]# nmap google.com

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2014-04-16 10:21 KST
Warning: Hostname google.com resolves to 16 IPs. Using 1.255.22.216.
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0
Nmap finished: 1 IP address (0 hosts up) scanned in 2.120 seconds
→ 아무 옵션 없이 nmap을 하면 ping 응답이 없는 서버에 대해 포트스캔을 하지 않는다.
→ -P0 옵션을 사용해보라는 메시지나 나온다.
Console
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[root@zetawiki ~]# nmap google.com -P0

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2014-04-16 10:22 KST
Warning: Hostname google.com resolves to 16 IPs. Using 1.255.22.231.
Interesting ports on 1.255.22.231:
Not shown: 1678 filtered ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

Nmap finished: 1 IP address (1 host up) scanned in 21.395 seconds
→ 포트 스캔 결과 80, 443 포트가 열려 있다.

3 같이 보기[ | ]