Introduction 

What does it do? 

This extension adds a new authentication service that logs a visitor into the TYPO3 frontend automatically if the IP address of their client matches one of the IP addresses configured on a fe_users record. A fe_users record can have any number of IP addresses - the visitor is logged in if ANY of them matches (OR logic).

Since jwauth re-checks the IP addresses on every single request instead of relying on a persisting login session, deactivating the extension or removing all matching IP addresses from a fe_users record immediately revokes access again.

Screenshot 

Here you see the new IP addresses relation field in the fe_users record. Each entry is its own small record holding one IP address or pattern.