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I recently updated OS system to Catalina 10.15.7, and found that it cannot connect to any internet automatically - I have to enter the DNS manually every time I connect to a new network, which is quite painful. I cannot find where to set up configure DNS automatically, could anyone please help me? Thanks!
MacBook Pro 13″, macOS 10.15
This almost sounds like it's an issue with your router. Click the "Network" icon in your system preferences. On the left panel, make sure the correct interface is selected (ie. "Ethernet") if you're on a hardline, or "Wifi" if you're connected wirelessly. On the right panel, make sure the pull-down window for "Configure IPv4" is "Using DHCP". That's all you need to do. It will pick up the settings from your router. For the most part, unless you require your Mac to use a static IP address, one generally leaves it as DHCP to let the network configure your connection.
Note: I'm assuming you're using this for your home network and it's nothing fancy.
This almost sounds like it's an issue with your router. Click the "Network" icon in your system preferences. On the left panel, make sure the correct interface is selected (ie. "Ethernet") if you're on a hardline, or "Wifi" if you're connected wirelessly. On the right panel, make sure the pull-down window for "Configure IPv4" is "Using DHCP". That's all you need to do. It will pick up the settings from your router. For the most part, unless you require your Mac to use a static IP address, one generally leaves it as DHCP to let the network configure your connection.
Note: I'm assuming you're using this for your home network and it's nothing fancy.
It will only automatically use the server DNS if it connects via DHCP.
If you are not using DHCP, then set whatever DNS you need. You can set multiple.
How to set up automatic configure DNS on Mac OS catalina
