User's Guide
Table Of Contents
- LTE Series
- User’s Guide
- Introduction
- The Web Configurator
- Quick Start
- Tutorials
- 4.1 Overview
- 4.2 Set Up a Wireless Network Using WPS
- 4.3 Connect to the Zyxel Device’s WiFi Network
- 4.4 Configure a Firewall Rule
- 4.5 Configure MAC Filter
- 4.6 Upgrade Firmware on the Zyxel Device
- 4.7 Back up a Configuration File
- 4.8 Restore Configuration
- 4.9 Configure DHCP
- 4.10 Configure Static Route for Routing to Another Network
- 4.11 Access the Zyxel Device Using DDNS
- Technical Reference
- Connection Status
- Broadband
- Home Networking
- Routing
- Network Address Translation (NAT)
- Dynamic DNS Setup
- Firewall
- MAC Filter
- Certificates
- Log
- Traffic Status
- ARP Table
- Routing Table
- Cellular WAN Status
- System
- User Account
- Remote Management
- Time Settings
- E-mail Notification
- Log Setting
- Firmware Upgrade
- Backup/Restore
- Diagnostic
- Troubleshooting
- Appendices
Chapter 12 Firewall
LTE Series User’s Guide
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1 Does this rule stop LAN users from accessing critical resources on the Internet? For example, if IRC
(Internet Relay Chat) is blocked, are there users that require this service?
2 Is it possible to modify the rule to be more specific? For example, if IRC is blocked for all users, will a rule
that blocks just certain users be more effective?
3 Does a rule that allows Internet users access to resources on the LAN create a security vulnerability? For
example, if FTP ports (TCP 20, 21) are allowed from the Internet to the LAN, Internet users may be able to
connect to computers with running FTP servers.
4 Does this rule conflict with any existing rules?
Once these questions have been answered, adding rules is simply a matter of entering the information
into the correct fields in the Web Configurator screens.