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two-way message exchanges while Aggressive mode only
requires 3 total message exchanges.
null modem. Cable or connection device used to connect two
computing devices directly rather than over a network.
-----P-----
packet. Logical grouping of information that includes a header
and data. Compare frame, datagram.
PAP. Password Authentication Protocol. Security protocol within
the PPP protocol suite that prevents unauthorized access to
network services. See RFC 1334 for PAP specifications. Com-
pare CHAP.
parity. Method of checking the integrity of each character
received over a communication channel.
Peer External IP Address. The Peer External IP Address is the
public, or routable IP address of the remote gateway or VPN
server you are establishing the tunnel with.
Peer Internal IP Network. The Peer Internal IP Network is the
private, or Local Area Network (LAN) address of the remote
gateway or VPN Server you are communicating with.
Peer Internal IP Netmask. The Peer Internal IP Netmask is the
subnet mask of the Peer Internal IP Network.
PFS Enable. Enable Perfect Forward Secrecy. PFS forces a DH
negotiation during Phase II of IKE-IPSec SA exchange. You can
disable this or select a DH group 1, 2, or 5. PFS is a security
principle that ensures that any single key being compromised
will permit access to only data protected by that single key. In
