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27D-Link DSL-2540B ADSL2+ 4-Port Router User Manual
Section 6 - Home
DNS
DNS Server Configuration
Use the DNS Server screen to request automatic
assignment of a DNS or to specify a primary and
secondary DNS.
If you uncheck the Enable Automatic Assigned
DNS checkbox, two additional fields will appear:
primary and secondary DNS server. Enter one
primary and one secondary DNS address in each
field. Click Apply to save the configuration.