sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/g'  /etc/sysctl.conf
sysctl -p

apt -y install mtr tcpdump iftop kpartx ipmitool dnsutils ddrescue autossh whois unzip wget  vim-conque  golang  git htpdate 

cd /tmp
VERSION=$(curl -Ss https://api.github.com/repos/fatedier/frp/releases/latest |grep tag_name|grep -Po '[0-9]+\.[0-9]+\.[0-9]+.*(?=")')
#wget $(curl -Ss https://api.github.com/repos/fatedier/frp/releases/latest |grep browser_download_url|grep linux_arm| cut -d '"' -f 4) -O - | tar xz
wget https://github.com/fatedier/frp/releases/download/v${VERSION}/frp_${VERSION}_linux_arm.tar.gz -O - | tar xz

cd frp_*_linux_arm
mkdir /etc/frp
sed  -i 's/network.target/network.target ntpdate.service/g' systemd/frp{c,s}.service
install frp{c,s} /usr/bin/
install systemd/frp{c,s}.service /usr/lib/systemd/system/
install frp{c,s}.ini  /etc/frp/
systemctl daemon-reload
systemctl enable frpc.service
systemctl start frpc.service
systemctl status frpc.service

frpc.ini配置为默认.

附:

Nginx的stream四层转发串口方案

stream {
server {
        listen  3501;
        proxy_connect_timeout 15s;
        proxy_timeout 30s;
        proxy_pass unix:/dev/ttyUSB0;
        #allow 333.333.333.0/24;  #白名单IP段
        #deny all;
    }
server {
        listen  3502;
        proxy_connect_timeout 15s;
        proxy_timeout 30s;
        proxy_pass unix:/dev/ttyUSB1;
        #allow 333.333.333.0/24;  #白名单IP段
        #deny all;
    }
 }

通过frp可以直接把串口丢到公网上去, 直接用telnet登陆进入串口.

telnet 公网IP 端口

frp和nginx主要做转发方案,  其他的还有隧道内网方案, 但基于没有独立IP的情况涉及第三方服务器服务, 像wireguard/ZeroTier/花生壳/蒲公英等等, 由于精力有限这里就暂时不涉及了. .

本文为草稿, 未完待续.