B222s User’s Guide 105
CHAPTER 12
Firewall
12.1 Overview
Use the LTE Device firewall screens to enable and configure the firewall that protects your LTE
Device and network from attacks by hackers on the Internet and control access to it. By default the
firewall:
• Allows traffic that originates from your LAN and WLAN computers to go to all other networks.
• Blocks traffic that originates on other networks from going to the LAN and WLAN.
The following figure illustrates the default firewall action. User A can initiate an IM (Instant
Messaging) session from the LAN to the WAN (1). Return traffic for this session is also allowed (2).
However other traffic initiated from the WAN is blocked (3 and 4).
Figure 59 Default Firewall Action
12.1.1 What You Can Do in this Chapter
•Use the General screen to enable or disable the LTE Device’s firewall (Section 12.2 on page
107).
•Use the Services screen to view the configured firewall rules and add, edit or remove a firewall
rule (Section 12.3 on page 108).
•Use the Access Control screen to view and configure incoming/outgoing filtering rules (Section
12.4 on page 109).
•Use the DoS screen to enable or disable Denial of Service (DoS) protection (Section 12.4 on
page 109).
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