查看和了解linux服務器所開放和使用的端口是維護工作中比較重要的工作。(以redhat server 5 為例)

1、nmap命令

# nmap -sT -O localhost

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2010-01-22 08:50 CST

Interesting ports on syapp1 (127.0.0.1):

Not shown: 1667 closed ports

PORT???? STATE SERVICE

21/tcp?? open? ftp

25/tcp?? open? smtp

80/tcp?? open? http

111/tcp? open? rpcbind

513/tcp? open? login

514/tcp? open? shell

631/tcp? open? ipp

2049/tcp open? nfs

3306/tcp open? mysql

5001/tcp open? commplex-link

5003/tcp open? filemaker

8009/tcp open? ajp13

8080/tcp open? http-proxy

No exact OS matches for host (If you know what OS is running on it, see http://www.insecure.org/cgi-bin/nmap-submit.cgi).

TCP/IP fingerprint:

SInfo(V=4.11%P=x86_64-redhat-linux-gnu%D=1/22%Tm=4B58F65C%O=21%C=1)

TSeq(Class=RI%gcd=1%SI=41495C%IPID=Z%TS=1000HZ)

TSeq(Class=RI%gcd=1%SI=414957%IPID=Z%TS=1000HZ)

T1(Resp=Y%DF=Y%W=8000%ACK=S++%Flags=AS%Ops=MNNTNW)

T2(Resp=N)

T3(Resp=Y%DF=Y%W=8000%ACK=S++%Flags=AS%Ops=MNNTNW)

T4(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=)

T5(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=)

T6(Resp=Y%DF=Y%W=0%ACK=O%Flags=R%Ops=)

T7(Resp=Y%DF=Y%W=0%ACK=S++%Flags=AR%Ops=)

PU(Resp=Y%DF=N%TOS=C0%IPLEN=164%RIPTL=148%RID=E%RIPCK=E%UCK=E%ULEN=134%DAT=E)

Uptime 0.610 days (since Thu Jan 21 18:12:54 2010)

Nmap finished: 1 IP address (1 host up) scanned in 9.955 seconds

2、lsof命令

/usr/sbin/lsof -i :端口

# /usr/sbin/lsof -i :3422

COMMAND? PID USER?? FD?? TYPE DEVICE SIZE NODE NAME

sshd??? 3828 root??? 3u? IPv6? 10063?????? TCP *:ssh (LISTEN)

總結

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