Looking for a freeware NT 4.0 firewall that ..........

[Shishir Belbase <shishpop @ ftp . com>]

 I have a NT box that has a PPP connection to the internet and I would like to give my
 clients access to the internet without having to run any socks, etc. on the clients.  My
 clients are windows, Unix, etc. They want to access ftp, telnet, mail, WWW, etc. 
 
 Is there a demo or shareware firewall that runs on NT and hides all the LAN
 addresses and proxies all the requests ?
 I am hoping that the clients can just specify the NT box as the default router and have
 the firewall handle the rest. I know there are proxy servers that run on NT but they do
 not handle all the client applications and also require some type of Socks enabled
 appliactions on the clients
 					
 				          DNS
 				          Router	
 				          Mail Server
                                                                           ----------
 -------------------Internet-------------------PPP-----------------|  NT  |---------------------------------------------------------
 				          ----------     Private LAN ( non routeable addr )
 				   ppp0       elnk0	
 
 Thanks !
 
 Shishir Belbase
 shishpop @
 ftp .
 com