User Manual

BROWAN COMMUNICATIONS Page 138
used to encapsulate IP packets for transport
between two peers.
To establish a PPP tunnel, both sides send LCP
frames to negotiate parameters and test the data
link. If authentication is used, at least one of the
peers has to authenticate itself before the network
layer protocol parameters can be negotiated using
NCP. During the LCP and NCP negotiation optional
parameters such as encryption, can be negotiated.
When LCP and NCP negotiation is done, IP
datagram can be sent over the link.
17. IPSec
Internet Protocol Security (IPSec) is a collection of
standards that was designed specifically to create
secure end-to-end secure connections. The
standards were developed by the Internet
Engineering Task For (IETF) to secure
communications over both public and private
networks, though it is particularly beneficial to
public networks. In this article I'll explain to you
some of the fundamentals of IPSec, how it is used,
and what products use it.