D@G˳@qI
[root@test root]# nmap localhost@@
# S[WѼơA nmap w]ѼƨӶi汽
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on vbird.adsldns.org (127.0.0.1):
(The 1539 ports scanned but not shown below are in state: closed)
Port       State       Service
21/tcp     open        ftp
22/tcp     open        ssh
23/tcp     open        telnet
Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
# ѤWiHݥXڪtΥثe@ 21, 22, 23 oT port }IӥB
# U port AȤ]QdXӤFI

DGG˳@qּ port XI
[root@test root]# nmap -p 1024-65535 localhost
# ȱ˸ּƪ port աI
Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on pc510.ev.ncku.edu.tw (127.0.0.1):
(The 64511 ports scanned but not shown below are in state: closed)
Port       State       Service
3306/tcp   open        mysql <==uo port QXoI
Nmap run completed -- 1 IP address (1 host up) scanned in 11 seconds

DTGH Ping 觋˼ƭӹqI
[root @test /root]# nmap -PT 192.168.1.171-177 
# ݨFaIˤ@ӰϬq۪qI

Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on linux172 (192.168.1.172):
(The 1536 ports scanned but not shown below are in state: closed)
Port       State       Service
110/tcp    open        pop-3
135/tcp    open        loc-srv
139/tcp    open        netbios-ssn
445/tcp    open        microsoft-ds
1025/tcp   open        listen
1110/tcp   open        nfsd-status

Interesting ports on linux174 (192.168.1.174):
(The 1537 ports scanned but not shown below are in state: closed)
Port       State       Service
110/tcp    open        pop-3
135/tcp    open        loc-srv
139/tcp    open        netbios-ssn
445/tcp    open        microsoft-ds
1025/tcp   open        listen

Interesting ports on linux176 (192.168.1.176):
(The 1537 ports scanned but not shown below are in state: closed)
Port       State       Service
110/tcp    open        pop-3
135/tcp    open        loc-srv
139/tcp    open        netbios-ssn
445/tcp    open        microsoft-ds
1025/tcp   open        listen

Nmap run completed -- 7 IP addresses (3 hosts up) scanned in 1 second
@IڭnuCqAҥHoCqu|^oIӨ𫟺uTҰʡAҥHMNu|Tq^աIoӤ觋ZAX@˱zl줺ҦqOI ^_^"

2. s}]wͮġG
[root@test root]# reboot

3. [ثe port }Ҧh֭ӡH
[root@test root]# netstat -an | more
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  7      [ ]         DGRAM                    944    /dev/log
unix  2      [ ]         DGRAM                    3162963
unix  2      [ ]         DGRAM                    739227
unix  2      [ ]         DGRAM                    739189
unix  2      [ ]         DGRAM                    1070
unix  2      [ ]         DGRAM                    953
unix  2      [ ]         STREAM     CONNECTED     690