A
PPLICATIONS
1-4
• DMZ Host Support
Allows a networked computer to be fully exposed to the Internet. 
This function is used when NAT and firewall security prevent an 
Internet application from functioning correctly.
•Security
The Barricade supports security features that deny Internet access to 
specified users, or filter all requests for specific services that the 
administrator does not want to serve. The Barricade’s firewall also 
blocks 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. 
WPA/WPA2, IEEE802.1x, WEP, SSID, and MAC filtering provide 
security over the wireless network.
• Virtual Private Network (VPN Pass-through)
The Barricade supports three of the most commonly used VPN 
protocols – PPTP, L2TP, and IPSec. These VPN protocols are 
transparent pass-through. The protocols supported by the Barricade 
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.
• L2TP merges the best features of PPTP and L2F – Like PPTP, 
L2TP requires that the ISP’s routers support the protocol.
• IP Security – Provides IP network-layer encryption. IPSec can 
support large encryption networks (such as the Internet) by using 
digital certificates for device authentication.