User's Manual

B222s User’s Guide 105
CHAPTER 12
Firewall
12.1 Overview
Use t he LTE Device firewall screens to enable and configure the firewall that protect s your LTE
Device and network fr om at t acks by hacker s on t he I nt ernet and cont rol access t o it. By default the
firewall:
• Allows traffic t hat originat es from your LAN and WLAN com put ers t o go t o all ot her networks.
• Blocks t raffic t hat originat es on ot her networks from going t o the LAN and WLAN.
The following figure illust rat es t he default fir ewall act ion. User A can initiat e an I M ( I nstant
Messaging) session from the LAN to t he WAN (1 ). Return t raffic for this session is also allowed ( 2 ) .
However other t raffic init iated from t he WAN is blocked ( 3 and 4 ).
Figure 59 Default Firewall Act ion
12.1.1 What You Can Do in this Chapter
• Use the Genera l screen t o enable or disable t he LTE Device’s firewall (
Section 12.2 on page
107
) .
• Use the Ser vices screen to view t he configur ed firewall rules and add, edit or rem ove a firewall
rule ( Sect ion 12.3 on page 108).
• Use the Access Cont rol screen t o view and configure incom ing/ out going filt ering rules (
Section
12.4 on page 109
) .
• Use the DoS screen to enable or disable Denial of Service ( DoS) prot ection (
Section 12.4 on
page 109
) .
WAN
LAN
3
4
1
2
A