Follow these instructions to ensure you are using DHCP when connecting to a network on a Mac. Pictures are attached below to assist you.
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Click on your wireless settings and click on Open Network Preferences...
- Click on Wi-Fi and then Advanced
- Click on TCP/IP
- Verify that it says Configure IPv4: Using DHCP
- Double check that it is "Using DHCP" and not "Using DHCP with manual address"