Nginx Reverse UDP & TCP Proxy

Reference:

• https://docs.nginx.com/nginx/admin-guide/load-balancer/tcp-udp-load-balancer/

Nginx Reverse Proxy:

Maybe you have Nginx as a front-end server on your cloud VPS, and you prefer to run back-end services on your own hardware, tunneled over a VPN.  The following can be added to the top-level nginx configuration (probably /etc/nginx/nginx.conf) to enable UDP and TCP reverse proxying to your back-end service:

stream {

    server {
        listen     12345;
        #TCP traffic will be forwarded
        proxy_pass <IP_or_domain>:12345;
    }

    server {
        listen     4444;
        #TCP traffic will be forwarded
        proxy_pass <IP_or_domain>:4444;
    }

    server {
        listen     4444 udp;
        #UDP traffic will be forwarded
        proxy_pass <IP_or_domain>:4444;
    }
}

Be sure the stream { ... } block is outside of the top-level http { ... } block.