User guide

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and branch offices to safely and affordably connect to a remote business network, for
effective communication and collaboration.
Wide Area Network Termination
PPPoE/PPPoA (Point-to-Point Protocol over Ethernet/ATM)
The PPPoE specification, incorporating the PPP and Ethernet standards, allows your com-
puter(s) to connect to your Service Provider’s network through your Ethernet WAN connec-
tion. The 3300-series Gateway supports PPPoE, eliminating the need to install PPPoE
client software on any LAN computers.
Service Providers may require the use of PPP authentication protocols such as Challenge
Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP).
CHAP and PAP use a username and password pair to authenticate users with a PPP server.
A CHAP authentication process works as follows:
1. The password is used to scramble a challenge string.
2. The password is a shared secret, known by both peers.
3. The unit sends the scrambled challenge back to the peer.
PAP, a less robust method of authentication, sends a username and password to a PPP
server to be authenticated. PAP’s username and password pair are not encrypted, and are
therefore sent “unscrambled”.
Instant-On PPP
You can configure your Gateway for one of two types of Internet connections:
• Always On
• Instant On
These selections provide either an uninterrupted Internet connection or an as-needed con-
nection.