[20171204]nc快速判断端口是否打开2.txt
--//前几天写了一篇通过nc快速判断打开那些端口,链接如下:
http://blog.itpub.net/267265/viewspace-2148121/
--//如果要判断一定的范围,可以执行如下:
$ echo a | nc -w 1 -n -v 192.168.xxx.xx 1-1521 2>/dev/null | grep "succeeded"
Connection to 192.168.xxx.xx 21 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 22 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 80 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 111 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 113 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 443 port [tcp/*] succeeded!
Connection to 192.168.xxx.xx 1521 port [tcp/*] succeeded!
--//在服务端检查如下:
# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:32768 0.0.0.0:* LISTEN 2553/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 2533/portmap
tcp 0 0 0.0.0.0:113 0.0.0.0:* LISTEN 27632/xinetd
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 2966/vsftpd
tcp 0 0 :::80 :::* LISTEN 26638/httpd
tcp 0 0 :::1521 :::* LISTEN 26334/tnslsnr
tcp 0 0 :::22 :::* LISTEN 12568/sshd
tcp 0 0 :::443 :::* LISTEN 26638/httpd
--//另外测试发现扫描还很快,如果我从1-65000,大约4-5秒ok(注另外的服务器):
# echo a | nc -w 1 -n -v 192.168.yyy.yy 1-65000 2>/dev/null | grep "succeeded"
Connection to 192.168.yyy.yy 22 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 111 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 833 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 857 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 953 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 1521 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 2049 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 51082 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 52744 port [tcp/*] succeeded!
Connection to 192.168.yyy.yy 57371 port [tcp/*] succeeded!
# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 192.168.yyy.yy:1521 0.0.0.0:* LISTEN 61210/tnslsnr
tcp 0 0 127.0.0.1:1521 0.0.0.0:* LISTEN 61210/tnslsnr
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 25383/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 29590/cupsd
tcp 0 0 0.0.0.0:953 0.0.0.0:* LISTEN 39779/rpc.statd
tcp 0 0 0.0.0.0:857 0.0.0.0:* LISTEN 39686/rpc.mountd
tcp 0 0 0.0.0.0:57371 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:2049 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:833 0.0.0.0:* LISTEN 39661/rpc.rquotad
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 39531/portmap
tcp 0 0 :::22 :::* LISTEN 25383/sshd
tcp 0 0 :::52744 :::* LISTEN 9755/ora_d000_book
tcp 0 0 :::51082 :::* LISTEN 14344/ora_d000_orcl
--//顺便解答链接的问题 [20170825]不启动监听远程能连接数据库吗2 =>[20170825]不启动监听远程能连接数据库吗
--//如何探测oracle 共享服务器端口,我感觉比nmap还有快.
