Manual:$wgCookieSetOnIpBlock

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Cookies: $wgCookieSetOnIpBlock
Determines whether to set a cookie when an IP user is blocked. Doing so means that a blocked user, even after moving to a new IP address, will still be blocked.
Introduced in version:	1.32.0 (Gerrit change 433624; git #e8063a08)
Removed in version:	Still in use
Allowed values:	(boolean)
Default value:	`true` (1.34+) `false` (1.32-1.33)
Other settings: Alphabetical \| By function

The cookie will contain an authentication code if $wgSecretKey is set, or otherwise will just be the block ID (in which case there is a possibility of an attacker discovering the names of revdeleted users, so it is best to use this in conjunction with $wgSecretKey being set).