TP-Link TD-8840 - Manual (Page 15)

TD-8840 ADSL2+ Modem Router User Guide
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Figure 3-2
Step 3: Select General tab, highlight Internet Protocol (TCP/IP), and then click the Properties
button.
Figure 3-3
Step 4: Select “Obtain an IP address automatically” and “Obtain DNS server address
automatically” in the screen below. And then click OK.