linux port open 확인

* IP에 대해 SYN 스캔을 한다.

타 서버에서 대상 서버에 포트가 열렸는지 체크한다.
자신서버에서 자신을 체크하면 당연히 열렸다고 나옴....

[root@]# nmap -sS 192.168.0.180

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-12-07 17:32 KST
Interesting ports on 150.23.27.180:
Not shown: 1670 filtered ports
PORT     STATE  SERVICE
21/tcp   open   ftp
23/tcp   open   telnet
161/tcp  closed snmp
162/tcp  closed snmptrap
543/tcp  closed klogin
544/tcp  closed kshell
1521/tcp open   oracle
1522/tcp closed rna-lm
1523/tcp closed cichild-lm
1524/tcp closed ingreslock

Nmap finished: 1 IP address (1 host up) scanned in 60.704 seconds
[root@]#