SLiRP is a (C)SLIP/PPP emulator which allows users with normal shell
accounts act as if they had a (C)SLIP/PPP account.  This allows users to use
Netscape/Mosaic, ftp, telnet, etc. from their home machine, as if they had a
real (C)SLIP/PPP connection (with limitations).

WWW: http://slirp.sourceforge.net/