tacacs+ is program that allow authorization and authentication via net on
remote access servers. Authnticate users, authorize commands and log 
accounting information.

tac+ia is improved tacacs server based on tac_plus package.

Additional features:
- improved configuration syntax
- acls
- time limits
- more variable substitutions in configuration file
- allow/deny lists
- tty lists
- host and port aliasing
- time intervals
- dynamic ip-address assignment
- passing uucp connections to uucico without rlogind authentication
and many other...