TP-Link TD-8840 User Manual page 15

Step 3: Select General tab, highlight Internet Protocol (TCP/IP), and then click the Properties
button.
Step 4: Select "Obtain an IP address automatically" and "Obtain DNS server address
automatically" in the screen below. And then click OK.
TD-8840 ADSL2+ Modem Router User Guide
Figure 3-2
Figure 3-3
9