Security of Networked Workstations with dial-up PPP Internet!!!

["Lachlan Mann" <docloc @ msn . com>]

Folks,

	Picture this:
	Windows95 Workstation on a private network (supposedly 	secure) with dial-up 
PPP to the internet.

I assume that windows 3.11,NT and 95 can forward packets from the PPP link to 
the local network, thereby acting as a router and exposing the private network 
to the internet.
Can anyone give me some specific examples of this ocurring and the security 
effects or point me at a RFC or whitepaper to read?

Thanks in advance,
	Lachlan