the best book i have found is Building and Managing Virtual Private
Networks, by Dave Kosiur. It describes all methods of encryption and
authentication. It's very good for understanding all the protocols
involved.
re the vpn speed - the Cisco Pix is very fast. here is a link to their
product de
i believe you're very wrong.
IPX is based on Xerox's XNS protocol. it is a client/server protocol and
was developed in the 1970s. Novell adopted it in the 1980s for use with
Netware.
TCP/IP was used by DOD for ARPANET and thus became the protocol of the
internet.
Later versions of IPX allowed
