Draytek Vigor2860 Series User Manual page 261

IP Address List
3. Click OK button to save the settings.
4. A new LAN DNS profile has been created.
The IP address listed here will be used for mapping with the
domain name specified above. In general, one domain name
maps with one IP address. If required, you can configure
two IP addresses mapping with the same domain name.
Add – Click it to open a dialog to type the host's IP
address.

Only responds to the DNS.... – Different LAN PCs
can share the same domain name. However, you have
to check this box to make the router identify &
respond the IP address for the DNS query coming
from different LAN PC.
Delete – Click it to remove an existed IP address on the list.
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Vigor2860 Series User's Guide