I had same problem after Big Sur update on macbook air.
For me solved by Goto Network Preferences -> Advanced -> TCP/IP
Note that IPv4 Address
Configure IPv4 - > Select Using DHCP with manual address
Enter the random IP address near to Default IPv4 Address you got in step2
Example -> If Default 192.168.1.202 change it to something like 192.168.1.204
Note ->. Do not go above the IP range of 255
saurabh47
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