ssh&telnet

NetCat网络工具：

root@10.1.1.43:~# nc -h
[v1.10-38]
connect to somewhere:	nc [-options] hostname port[s] [ports] ... 
listen for inbound:	nc -l -p port [-options] [hostname] [port]
options:
	-c shell commands	as `-e'; use /bin/sh to exec [dangerous!!]
	-e filename		program to exec after connect [dangerous!!]
	-b			allow broadcasts
	-g gateway		source-routing hop point[s], up to 8                          设置路由器跃程通信网关，最高可设置8个。
	-G num			source-routing pointer: 4, 8, 12, ...                         设置来源路由指向器，其数值为4的倍数。
	-h			this cruft 
	-i secs			delay interval for lines sent, ports sca                      延时的间隔
        -k                      set keepalive option on socket
	-l			listen mode, for inbound connects                             监听模式,入站连接
	-n			numeric-only IP addresses, no DNS                             直接使用ip地址,而不用域名服务器
	-o file			hex dump of traffic                                           指定文件名称，把往来传输的数据以16进制字码倾倒成该文件保存。
	-p port			local port number                                             本地端口
	-r			randomize local and remote ports                              随机本地和远程端口 
	-q secs			quit after EOF on stdin and delay of secs
	-s addr			local source address  
	-T tos			set Type Of Service
	-t			answer TELNET negotiation   
	-u			UDP mode                                                      udp  模式
	-v			verbose [use twice to be more verbose]                        显示过程,vv 更多
	-w secs			timeout for connects and final net reads                      等待连接超时
	-z			zero-I/O mode [used for scanning]                             使用输入/输出模式，只在扫描通信端口时使用。

使用nc -z 192.168.1.6 10-800  扫描ip为  192.168.1.6的10到800的端口是否打开；

然后使用可以发现如果有telnet或者ssh就可以连接了；

ssh username@192.168.1.6 

scp news/news.err  username@192.168.1.6:/home/my/dir