Applications
IOLINK-520 & IOLINK-PRO Installation & Applications Guide — 2.13
2.1.4 - PPP Overview
Point to Point Protocol (PPP) is a connection protocol that allows control over the set-up
and monitoring of network communications. It is used in procedures for user authentication
(name and password), connection management (spoofing, bandwidth on demand, multilink),
and compression. If any these functions are required on a frame relay connection, PPP
encapsulation within frame relay is available.

2.1.4.1 - PPP Link Configuration

A PPP connection between two routers may use a number of Network Control Protocols for
communication. An IP router connection will use the Internet Protocol Control Protocol
(IPCP) for all IP communications. An IPX router connection will use the Internet Packet
Exchange Control Protocol (IPXCP) for all IPX communications.
In order to establish an IPCP or IPXCP link connection between two PPP routers, either a
numbered link or an unnumbered link connection must be established. The two types of
link connections are available to allow for greater flexibility between vendors products.

2.1.4.2 - Numbered Links

A numbered link assigns a network address (either IP or IPX) to both ends of the WAN
connection. In a numbered link configuration, the WAN connection may be viewed as
another LAN network with the two PPP routers simply routing information between their
local LANs and the common connected WAN network.
Because the WAN is considered a separate network, each of the stations on that network
must be assigned a network address. If a numbered IP link is to be established, then each
WAN interface must be assigned an IP address on a unique IP network. The WAN IP
network address must be different from the two existing networks that are being connected
together with the PPP routers.
Location: Main
! Configuration
! Connections Set-up
! Remote Site Set-up
! Edit Remote Site
! Protocol Set-up
! IP Parameters
! Link IP address
If a numbered IPX link is to be established, then each WAN interface must be assigned an
IPX node address on a unique IPX network number. The WAN IPX network address must
be different from the two existing networks that are being connected together with the PPP
routers.
The IPX node address of the local WAN link is defined as the Local IPX Node within the
remote site profile settings. The IPX address of the WAN link of the remote PPP router is
defined as the Peer IPX Node within the remote site profile settings. The WAN IPX
network number is defined with the IPX Net option in the remote site profile settings.
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