Dynamic DNS

1. Install ddns-scripts + luci app (GUI)

   apk add ddns-scripts
   apk add luci-app-ddns
   

2. Configure /etc/config/ddns (using ddns.de):

   config service 'ddnss'          
           option interface 'wan'
           option ip_source 'network'
           option ip_network 'wan'   
           option enabled '1'            
           option check_interval '1'             
           option check_unit 'hours'
           option lookup_host '<DOMAIN>' # e.g. eschle.ddnss.eu
           option update_url '<UPDATE_URL_FROM_DDNS>' #e.g. https://ddnss.de/upd.php?key=SOMEKEY&host=eschle.ddnss.eu
   

3. Restart ddns

   /etc/init.d/ddns restart
   

alternatively:

1. create a script updating the dynamic DNS

   #!/bin/sh
   IP=`curl https://ipinfo.io/ip`
   curl -X POST "<UPDATE_URL_FROM_DDNS>" #e.g. https://ddnss.de/upd.php?key=SOMEKEY&host=eschle.ddnss.eu&ip=${IP}"
   

2. schedule script

   # trigger update dynamic dns script
   0 1 * * * /root/bin/updateDynDns.sh