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2. Special accounts

Many user accounts are used to control specific tasks. Those accounts are special purpose. They have a user ID and belong to a group. They also have a password. Those accounts are not meant for human being though.

2.1 Edit/Create PPP account via normal login

Those accounts let a remote machine connects and establish a network connection using the PPP protocol. The remote must identify using a standard chat sequence, sending its user name followed by a password.

2.2 PPP account via PAP authentification

Those accounts are meant for authentication using the PAP protocol. User name and password are exchange using a special protocol defined in the PPP standard.

2.3 PPP account via CHAP authentification

Same as above, except that a different, more secure, protocol is used to exchange authentification.

2.4 SLIP account via normal login

SLIP is another way of establishing a network connection between two computer over a serial line (modem).

2.5 UUCP account

UUCP is the Unix to Unix Communication Protocol. This is a batch oriented data transfer. It allows unattended exchange of files (and email) between two computers. It provides a very inexpensive but highly reliable way to automate data exchange. It is probably the best way (by far) to receive and send email on the internet unless you have a dedicated connection with your service provider.

See the networking section of Linuxconf to configure UUCP.

2.6 POP accounts (mail only)

POP acccounts are restricted accounts. Users can't get a shell. They are generally used to retrieve email using the POP (Post Office Protocol). They are also usable to connect to other service such the Samba (file and print service for PCs machines)

2.7 Virtual POP accounts (mail only)

Those accounts are much more restrictive accounts. They allow retrieval of email using the POP protocol, from virtual email domain. See the menu "Networking/mail delivery system (sendmail)" to configure virtual email domain.


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