Change Chipset Regulations
Countries’ regulations can be fairly complex, and CRDA sets the radio to operate within the regulations of the operating country. Specifically, it enforces transmit power limits on the radio, prevents the radio from transmitting on restricted frequencies, and abides by any other limitation such as DFS. The iw reg command interacts with CRDA to query, and in some cases, change it.
To display the current regulatory domain, we use iw reg get:
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kali@kali:~$ sudo iw reg get
global
country MX: DFS-FCC
(2402 - 2482 @ 40), (N/A, 20), (N/A)
(5170 - 5250 @ 80), (N/A, 17), (N/A), AUTO-BW
(5250 - 5330 @ 80), (N/A, 24), (0 ms), DFS, AUTO-BW
(5490 - 5730 @ 160), (N/A, 24), (0 ms), DFS
(5735 - 5835 @ 80), (N/A, 30), (N/A)
To change or set the regulatory domain, we run iw reg set <COUNTRY> where “COUNTRY” is the 2 letter code for the country we are currently in.