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====== VPN ======


===== openVPN =====

TBD


===== Headscale / Tailscale =====

Headscale is the open source variant of Tailscale.

Install it on your Server: [[https://headscale.net/running-headscale-linux/]]

Proxy it via nginx to get httpS. Nginx Example Config:

  map $http_upgrade $connection_upgrade {                                                                                                                                                   
    default      keep-alive;                                                                                                                                                              
    'websocket'  upgrade;                                                                                                                                                                 
    ''           close;                                                                                                                                                                   
  }                                                                                                                                                                                         
                                                                                                                                                                                          
  server {                                                                                                                                                                                  
    listen 80;                                                                                                                                                                            
    listen [::]:80;                                                                                                                                                                       
                                                                                                                                                                                          
    listen 443      ssl http2;                                                                                                                                                            
    listen [::]:443 ssl http2;                                                                                                                                                            
                                                                                                                                                                                          
    server_name <YOUR DOMAIN>;                                                                                                                                                      
                                                                                                                                                                                          
    ssl_certificate /etc/letsencrypt/live/<YOUR DOMAIN>/fullchain.pem;                                                                                                              
    ssl_certificate_key /etc/letsencrypt/live/<YOUR DOMAIN>/privkey.pem;                                                                                                            
    ssl_protocols TLSv1.2 TLSv1.3;                                                                                                                                                        
                                                                                                                                                                                          
    location / {                                                                                                                                                                          
        proxy_pass https://<HEADSCALE SERVER IP>:8080;                                                                                                                                           
        proxy_http_version 1.1;                                                                                                                                                           
        proxy_set_header Upgrade $http_upgrade;                                                                                                                                           
        proxy_set_header Connection $connection_upgrade;                                                                                                                                  
        proxy_set_header Host $server_name;                                                                                                                                               
        proxy_redirect http:// https://;                                                                                                                                                  
        proxy_buffering off;                                                                                                                                                              
        proxy_set_header X-Real-IP $remote_addr;                                                                                                                                          
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;                                                                                                                      
        proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;                                                                                                                       
        add_header Strict-Transport-Security "max-age=15552000; includeSubDomains" always;                                                                                                
    }                                                                                                                                                                                     
  }  


Install Tailscale Client on your Clients: [[https://tailscale.com/download/linux]]

Then run:

  tailscale up --login-server https://<YOUR DOMAIN>

which will give you the server Add command in the browser. Mission complete :)

===== tinc =====

  apt install tinc net-tools

Generate keys:

  tincd -n <netname> -K8192

Setup tinc.conf, tinc-up, tinc-down

Configure the /hosts/<hostname> file like:

  Address = <myip>
  Port = 55555
  Subnet = 10.5.0.xxx


Copy the generated hosts/<hostname> file to *all* other servers and get the other host files

Start tinc:
  tincd -n <netname> 

For debugging, do not detach:
  tincd -n <netname> -D


Enable at boot via systemd

  systemctl enable tinc@vpnname
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