IPv6 completely ignored by FE/BE lockIP
I got the privacy extensions enabled on my system, which causes the IPv6 to change quite frequently.
But the ['BE']['lockIP'] setting is useless for IPv6. So Typo3 throws me out of the backend if the IP changes.
I would propose to add an additional config value only for IPv6 addresses (['BE']['lockIPv6'] and ['FE']['lockIPv6'])
some changes i managed to trace back:
sysext/core/Classes/Core/Bootstrap.php -> initializeBackendUser()
sysext/core/Classes/Authentication/AbstractUserAuthentication.php -> ipLockClause_remoteIPNumber()
since IPv6 becomes more and more popular this becomes more and more of an issue