[linux] 리눅스에서 열린 포트 확인하는 방법

$> nmap -v 서버아이피

 

예)

$> nmap -v ftp.kaist.ac.kr

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-09-24 15:57 KST

DNS resolution of 1 IPs took 6.50s.

Initiating SYN Stealth Scan against ftp.kaist.ac.kr (143.248.234.110) [1680 ports] at 15:57

Discovered open port 21/tcp on 143.248.234.110

The SYN Stealth Scan took 23.95s to scan 1680 total ports.

Host ftp.kaist.ac.kr (143.248.234.110) appears to be up ... good.

Interesting ports on ftp.kaist.ac.kr (143.248.234.110):

Not shown: 1679 filtered ports

PORT   STATE SERVICE

21/tcp open  ftp

 

Nmap finished: 1 IP address (1 host up) scanned in 30.569 seconds

               Raw packets sent: 3365 (148.040KB) | Rcvd: 6 (276B)

 

 

<아이피 확인>

$> nslookup ftp.kaist.ac.kr

 

예)

$> nslookup ftp.kaist.ac.kr

Server:     203.241.132.34

Address:    203.241.132.34#53

 

Non-authoritative answer:

Name:   ftp.kaist.ac.kr

Address: 143.248.234.110