dynamic WAN IP connection is used.
For instance,
If your ISP connection service uses the dynamic WAN IP, tick the Auto Detect checkbox to let the DDNS server learn your current WAN IP address. Enter your DDNS account Username and Password.
However, if you are using a fixed WAN IP connection, enter the IP address in the WAN IP field. Then,
Step 4:
(Optional) If you enable the wildcard service, your hostname would be allowed multiple identities.
For example, if you register: mydomain.2mydns.net,
users looking for www.mydomain.2mydns.net or ftp.mydomain.2mydns.net can still reach your hostname.
Step 5:
(Optional) In the Mail Exchanger field, enter the Static WAN IP address of the mail server configured to handle email for your domain. Select Backup Mail Exchanger to enable this service.
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