Although Macs are exceptionally reliable computers that are well suited for browsing the Web, even they sometimes experience problems when trying to connect to the Internet. Internet connection issues are usually hard to diagnose, especially for less experienced Mac users. This article has been created as a guide for solving the majority of Internet-related issues commonly encountered by members of the Apple family.
Expiring DHCP Lease
A regularly dropping Internet connection and a message prompting a user to “renew DHCP lease” are issues that can be solved by changing the settings of the AirPort utility, which is located in the Utilities folder. Check whether the utility is updated and install the new update if needed. If the update doesn’t help, remove all network connections and reboot the machine. Another approach to solving the issue is to set the maximum number of days in the DHCP lease field, thereby making sure that the lease does not expire every 10 to 15 minutes.
If a user has a hidden network, their iMac or MacBook will not be able to connect to it after a reboot. To unhide the network, it is necessary to delete it from the Preferred Networks and then add it again.
IPv6 Protocol Issues
The switch to the new IP address format causes connectivity issues for some Mac users. Those who do not have the Internet connection after the switch has taken place should try disabling it by running the following command in the Terminal: networksetup-setv6off “Wi-Fi”. By doing this, it is also possible to make the connection quicker.
Internet Service Provider Issues
Once in a while, Internet Service Providers (ISPs) experience problems on their end, which calls for switching on and off a router to resume the connection.
To check whether the lack of the Internet connection is a router’s fault, it is necessary to bypass the router. To do so, use the Ethernet cable to connect the computer to the modem. Then, in the System Preferences, go to the Network tab and select Ethernet option from the list.
The issue of the slow connection can be resolved by changing a router’s location. Under no circumstances, it is wise to place the router close to large metal surfaces such as filing cabinets or radiators. A signal can also be blocked by thick walls. To find out what creates unnecessary interferences, try using Wi-Fi scanning utilities that are freely available on the Mac App Store. Alternatively, use Wireless Diagnostics app that comes with macOS. The app analyses the Wi-Fi signal and creates transmission rate, quality, and noise level graphs.