These programs log the client host name of incoming telnet, ftp, rsh, rlogin, finger etc. Another IP access control package is the IP Filter by Darren Reed. IP Filter acts as a shim in the IP stack, applying access control rules to incoming and outgoing IP packets. Instructions on installation and configuration come with the distribution. Encryption When logging into another computer over the network, there is a danger that an eavesdropper is recording your username and password as you type it, along with everything else you type.
All communications are automatically and transparently encrypted.
Encryption is also used to protect against spoofed packets. X11 connection forwarding provides secure X11 sessions. An authentication agent, running in the user's local workstation or laptop, can be used to hold the user's RSA authentication keys. Complete replacement for rlogin, rsh, and rcp. There are a variety of ssh clients available for Macintosh and Windows systems as well, enabling secure logins to a UNIX system from several different platforms.