WiFi security
weak wifi Security setting for router.
How to reset router settings.
iPad Pro, 16
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There are so many different WiFi Routers, each with their own unique User Interface, it is impossible to provide explicit instructions. That said, the majority a domestic WiFi Routers will have web-interface that can be accessed from any computer that is joined to your network, simply by using a web browser. Alternatively, some Routers will require you to install an App - with which to perform initial setup.
In all cases, refer to your WiFi Router’s User Guide for setup and/or reset instructions. If the Router was supplied by your Internet Service Provider (ISP), you may need to refer to your ISP’s online technical resources.
If you are concerned about iPad warnings concerning weak security, or other elements of your WiFi setup, your WiFi network may benefit from update in either settings or improved hardware...
Your iPad is no less secure today than it was prior to the update to recent version of iPadOS. However, your iPad is now much better able to [warn] bring to your attention potential security deficiencies of your WiFi network and iPad settings.
This support page will describe the more secure (recommended) settings for WiFi:
Recommended settings for Wi-Fi routers and access points – Apple Support
It is possible that your WiFi Router is too old to be (or not capable of being) configured for more secure settings. As such, you can either configure the most secure settings that your Router will support - or replace your Router with something more advanced that provides better security configuration options.
Whilst WPA3 is the newest standard, you should aim to use WPA2 (AES-PSK) as a minimum. Some Routers seemingly continue to support the insecure/deprecated TKIP standards - even when apparently configured for WPA2 operation; TKIP will definitely cause a security warning to appear. Be aware that if you are using a WiFi network extender, these may continue to use weaker security standards - and continue to trigger a warning.
There is a also new privacy feature included within iOS/iPadOS14-16 that hides your physical MAC Address - and instead uses a randomly selected Private MAC Address. This feature can be enabled/disabled on your iPhone/iPad for each configured WiFi Network. This feature also has bearing upon the appearance of the Weak Security notifications.
More information about this new feature can be found here:
Use private Wi-Fi addresses in iOS 14, iPadOS 14 and watchOS 7 – Apple Support
If you are unable to employ more secure security settings on your WiFi network, you might consider replacement of your WiFi network equipment, such as your WiFi Router, with more advanced equipment. However, if the router is provided by your ISP, this may not be practical proposition. A potentially cheaper and more flexible approach might be to add an additional upstream WiFi Router, of WiFi Access Point (AP) that meets the required standards.