Accton Technology CheetahAccess AC-IG1004, Руководство пользователя, Страница: 13 / 96

Introduction
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• Security
The CheetahAccess Internet Gateway supports security features that
can deny Internet access to specified users, or filter all requests for
specific services the administrator does not want to serve. The
CheetahAccess Internet Gateway’s firewall can also block common
hacker attacks, including IP Spoofing, Land Attack, Ping of Death, IP
with zero length, Smurf Attack, UDP port loopback, Snork Attack, TCP
null scan, and TCP SYN flooding.
• Virtual Private Network
The CheetahAccess Internet Gateway supports three of the most
commonly used VPN protocols – PPTP, L2TP and IPSec. These
protocols allow remote users to establish a secure connection to their
corporate network. If your service provider supports VPNs, then any of
these protocols can be used to create an authenticated and encrypted
tunnel for passing secure data over the Internet (i.e., a traditionally
shared data network). The VPN protocols supported by the
CheetahAccess Internet Gateway are briefly described below.
• Point-to-Point Tunneling Protocol – Provides a secure tunnel for
remote client access to a PPTP security gateway. PPTP includes
provisions for call origination and flow control required by ISPs.
• Layer Two Tunneling Protocol – Includes most of the features
provided by PPTP, but has less overhead and is more suited for
managed networks.
• IP Security – Provides IP network-layer encryption. IPSec can
support large encryption networks (such as the Internet) by using
digital certificates for device authentication.