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20
2009 Industrial Wireless Guidebook
Understanding Industrial WLAN – IEEE 802.11
2
Using a Firewall as an Additional Safeguard
One of the most basic aspects of maintaining the security of your network involves using a firewall to filter out
unwanted traffic. To protect a private LAN from unwanted traffic originating outside the LAN, firewall software
often runs on a gateway that connects the LAN to the Internet. The firewall is configured to filter out traffic
based on various characteristics of the incoming packets, such as IP address, MAC address, type of protocol,
etc.
unwanted traffic. To protect a private LAN from unwanted traffic originating outside the LAN, firewall software
often runs on a gateway that connects the LAN to the Internet. The firewall is configured to filter out traffic
based on various characteristics of the incoming packets, such as IP address, MAC address, type of protocol,
etc.
Even if your private LAN does not connect to a public network, once you allow access to the LAN through a
wireless AP, you open the network to possible external attack. As an added safeguard, some manufacturers
include firewall software on the access point to filter out traffic accessing the network through the AP. For
example, Moxa’s AWK-3121 supports the latest encryption technology (WEP, WAP, WAP2) and allows system
managers to filter traffic by MAC address, IP, as well as TCP/UDP filtering options.
wireless AP, you open the network to possible external attack. As an added safeguard, some manufacturers
include firewall software on the access point to filter out traffic accessing the network through the AP. For
example, Moxa’s AWK-3121 supports the latest encryption technology (WEP, WAP, WAP2) and allows system
managers to filter traffic by MAC address, IP, as well as TCP/UDP filtering options.