通过公网IP主机建立ssh隧道

环境描述

• hostA: 有公网IP的linux主机
• hostB: 私有路由器后端无公网IPlinux主机，能够ssh连接到hostA
• hostC: 个人pc机

隧道创建步骤

• step1 在hostB上执行如下开通ssh tunnel

#!/bin/bash
createTunnel() {
    /usr/bin/ssh -f -N -R 10022:localhost:22 -L19922:HostA:22 HostA
    if [[ $? -eq 0 ]]; then
        echo Tunnel to HostA created successfully
    else
        echo An error occurred creating a tunnel to HostA. Return code: $?
    fi
}
/usr/bin/ssh -p 19922 localhost ls > /dev/null
if [[ $? -ne 0 ]]; then
    echo Creating new tunnel connection to HostA
    createTunnel
fi

• step2 在hostC上连接到hostB

ssh -t HostA 'ssh localhost -p 10022'

references

• Howto Access a Linux Machine Behind a Home Router With SSH Tunnels