Create dynamic-dns.md

Author: TimoDJatomika

dynamic-dns.md

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+# Configure Dynamic DNS
+This tutorial explains how to configure dynamic dns. This can be usefull if your ISP only gives you a dynamic IP address (and not a static one) but you still want to access your edgerouter (e.g. connect via VPN).
+Prerequisite for this tutoiral is a valid domain that you own (e.g. example.com) and an free account at [cloudflare](https://www.cloudflare.com/).
+
+Note you have to create an *A Record* in your cloudflare dashboard beforehand. E. g. `router.example.com A 1.2.3.4`.
+
+Please replace 
+- router.example.com -> with your subdomain
+- info@example.com -> with your cloudflare e-mail address
+- your-cloudflare-api-key -> with you cloudflare global API Key. For help look [here](https://support.cloudflare.com/hc/en-us/articles/200167836-Managing-API-Tokens-and-Keys) (note this is not your cloudflare login password)
+- example.com -> with your domain
+
+```
+configure
+set service dns dynamic interface pppoe0 service custom-cloudflare host-name router.example.com
+set service dns dynamic interface pppoe0 service custom-cloudflare login info@example.com
+set service dns dynamic interface pppoe0 service custom-cloudflare password <your-cloudflare-api-key>
+set service dns dynamic interface pppoe0 service custom-cloudflare protocol cloudflare
+set service dns dynamic interface pppoe0 service custom-cloudflare options zone=example.com
+commit
+save
+
+```
+
+## Verify the configuration
+With `show dns dynamic status` you can list the status of the dynamic dns confguration.
+When you `ping router.example.com` the IP address of your router should appear. 
+
+
+Source: https://help.ui.com/hc/en-us/articles/204976324-EdgeRouter-Custom-Dynamic-DNS