How do you check if a port is open when you cannot use telnet or install Cacti? I want to see if a port is open between two Linux servers. Telnet isn't installed. I tried this command:
当您不能使用telnet或安装Cacti时，如何检查端口是否打开?我想看看两个Linux服务器之间是否打开了一个端口。Telnet不安装。我试着这个命令:
cat < /dev/tcp/x.x.x.x/6061
where x.x.x.x was the remote IP address of the Linux server and port 6061 is the port that I want to test. But based on tests of known working and not working ports, this command wasn't conclusive to me. There may be an environmental explanation for that.
. x.x.x的地方。x是Linux服务器的远程IP地址，端口6061是我要测试的端口。但是基于已知的工作和不工作端口的测试，这个命令对我来说不是决定性的。这可能有一个环境上的解释。
2 个解决方案
#1
2
Install nmap and than:
安装nmap和比:
nmap x.x.x.x
#2
1
Better use (if installed) : netcat :
更好的使用(如果安装):netcat:
nc -zw3 <host> <port>
If you want to use the bash feature net redirection :
如果你想使用bash特性，net重定向:
cat < /dev/tcp/x.x.x.x/6061
do it the right way :
用正确的方式:
{ exec 3<> /dev/tcp/127.0.0.1/6061; } &>/dev/null &&
echo "Connection to socket OK" ||
echo >&2 "Can't connect"
If it doesn't work, you need to compile bash with --enable-net-redirections
如果它不起作用，您需要使用—enable-net-redirections编译bash
#1
2
Install nmap and than:
安装nmap和比:
nmap x.x.x.x
#2
1
Better use (if installed) : netcat :
更好的使用(如果安装):netcat:
nc -zw3 <host> <port>
If you want to use the bash feature net redirection :
如果你想使用bash特性，net重定向:
cat < /dev/tcp/x.x.x.x/6061
do it the right way :
用正确的方式:
{ exec 3<> /dev/tcp/127.0.0.1/6061; } &>/dev/null &&
echo "Connection to socket OK" ||
echo >&2 "Can't connect"
If it doesn't work, you need to compile bash with --enable-net-redirections
如果它不起作用，您需要使用—enable-net-redirections编译bash