端口扫描
代码语言：javascript复制[root@h102 ~]# nc -zvn 192.168.100.101 20-25
nc: connect to 192.168.100.101 port 20 (tcp) failed: No route to host
nc: connect to 192.168.100.101 port 21 (tcp) failed: No route to host
Connection to 192.168.100.101 22 port [tcp/*] succeeded!
nc: connect to 192.168.100.101 port 23 (tcp) failed: No route to host
nc: connect to 192.168.100.101 port 24 (tcp) failed: No route to host
nc: connect to 192.168.100.101 port 25 (tcp) failed: No route to host
[root@h102 ~]# nc -zvn 192.168.100.101 3306
Connection to 192.168.100.101 3306 port [tcp/*] succeeded!
[root@h102 ~]# Option | Comment |
|---|---|
-z | 只作扫描，不发数据 |
-n | 不作解析，数字状态 |
-v | 给出详细信息 |
打开一个会话连接
代码语言：javascript复制[root@h102 ~]# nc -l 12345
hello
for test
i miss you
^_^
----------
[root@h101 BGPtest]# nc h102 12345
hello
for test
i miss you
^_^ 此刻，要确认server端的防火墙对于12345端口是打开的
文件传输
server端发文件
代码语言：javascript复制[root@h102 nc]# echo "abc test" > file.txt
[root@h102 nc]# nc -l 2345 < file.txt
----------
[root@h101 nc]# nc h102 2345 > f.txt
[root@h101 nc]# cat f.txt
abc test
[root@h101 nc]# server端收文件
代码语言：javascript复制[root@h102 nc]# nc -l 2345 > file.txt
----------
[root@h101 nc]# echo "uiuiuiuiui" > f.txt
[root@h101 nc]# nc -v h102 2345 < f.txt
Connection to h102 2345 port [tcp/dbm] succeeded!
[root@h101 nc]#
----------
[root@h102 nc]# cat file.txt
uiuiuiuiui
[root@h102 nc]# 
