NatACL

NatACL is an authentication daemon that enables NAT and transparent proxying. Its key function is to act as a man in the middle for outbound HTTP requests and direct users to a login/password page in order to request credentials for outbound connections. Once proper credentials are received, NAT rules are automatically generated.

The installation process for NatACL is straightforward. For Linux operating systems, simply type "make" followed by "make install". However, if you are updating from a previous version, you may need to manually update your /usr/local/etc/NatACL.conf.

In summary, NatACL is a reliable and secure option for managing authentication for NAT and transparent proxying in your network. Its automated rule generation makes it a convenient choice for busy system administrators.