Linksys WRT54GX manual Security Tab Firewall

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Wireless-G Broadband Router with SRX

RTS Threshold. Should you encounter inconsistent data flow, only minor reduction of the default value, 2347, is recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS) frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value of 2347.

Preamble Type. The preamble defines the length of the CRC block for communication between the Router and the roaming Network Card. (High network traffic areas should use the shorter preamble type.) Select the appropriate preamble type, Long Preamble (default) or Short Preamble.

Network Density. This setting is a reflection of the Router’s range. Setting the density to Low provides you with a greater range. Setting the density to High gives you a lower range. The default setting is Medium.

Change these settings as described here and click the Save Settings button to apply your changes or Cancel Changes to cancel your changes.

The Security Tab - Firewall

Firewall Protection. Enable this feature to employ Stateful Packet Inspection (SPI) for more detailed review of data packets entering your network environment.

Block WAN Ping. Enable the Block WAN Ping feature by checking the box beside Block WAN Ping and you can prevent your network from being “pinged,” or detected, by other Internet users. The Block WAN Ping feature also reinforces your network security by hiding your network ports. Both functions of the Block WAN Ping feature make it more difficult for outside users to work their way into your network. This feature is enabled by default.

VPN Passthrough. These settings allow VPN tunnels using IPSec, PPTP, or L2TP protocols to pass through the Router’s firewall. Internet Protocol Security (IPSec) is a suite of protocols used to implement secure exchange of packets at the IP layer. To allow IPSec tunnels to pass through the Router, click Enable. Point-to-Point Tunneling Protocol (PPTP) allows the Point-to-Point Protocol (PPP) to be tunneled through an IP network. To allow PPTP tunnels to pass through the Router, click Enable. Layer 2 Tunneling Protocol (L2TP) is the method used to enable Point-to-Point sessions via the Internet on the Layer 2 level. To allow L2TP tunnels to pass through the Router, click Enable.

Change these settings as described here and click the Save Settings button to apply your changes or Cancel Changes to cancel your changes.

Figure 5-23: Security Tab - Firewall

firewall: a set of related programs located at a network gateway server that protects the resources of a network from users from other networks.

Chapter 5: Configuring the Wireless-G Broadband Router

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The Security Tab - Firewall

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Contents 802 GHz .11g Wireless- G Word definition How to Use This User GuideCopyright and Trademarks Table of Contents Common Problems and Solutions Frequently Asked Questions Appendix a TroubleshootingAppendix B Wireless Security Router’s Back Panel Router’s Reset Button27 Port Services Welcome IntroductionWhat’s in this Guide? Wireless-G Broadband Router with SRX Ad-Hoc versus Infrastructure Mode Planning Your Wireless NetworkNetwork Topology Network LayoutPlanning Your Wireless Network Network Layout Back Panel Getting to Know the Wireless-G Broadband RouterDMZ Front PanelOverview Connecting the Wireless-G Broadband RouterPassword Screen Configuring the Wireless-G Broadband RouterInternet Setup Setup Tab Basic SetupStatic IP Connection Type Pptp Connection Type Packet a unit of data sent over a network Network SetupNetwork Address Server Settings Dhcp 12 Setup Tab Ddns Setup Tab Ddns13 Setup Tab MAC Address Clone Setup Tab MAC Address Clone14 Setup Tab Advanced Routing Setup Tab Advanced Routing16 Wireless Tab Basic Wireless Settings Wireless Tab Basic Wireless SettingsWPA Radius Wireless Tab Wireless SecurityWEP 20 Wireless Tab Wireless MAC Filter Wireless Tab Wireless MAC Filter22 Wireless Tab Advanced Wireless Settings Wireless Tab Advanced Wireless Settings23 Security Tab Firewall Security Tab FirewallTo create an Internet Access policy Access Restrictions Tab Internet AccessUrl the address of a file located on the Internet Ftp a protocol used to transfer files over a TCP/IP networkApplications and Gaming Tab Port Triggering Applications and Gaming Tab Port Range ForwardUPnP Forwarding Applications and Gaming Tab DMZApplications and Gaming Tab UPnP Forwarding Snmp Administration Tab ManagementUPnP Administration Tab LogAdministration Tab Diagnostics Administration Tab Firmware Upgrade Administration Tab Factory DefaultsIsp your internet provider Administration Tab Config ManagementStatus Tab Router 39 Status Tab Local Network Status Tab Local NetworkEncryption encoding data transmitted in a network Status Tab WirelessSystem Performance Status Tab System PerformanceWireless-G Broadband Router with SRX Need to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions For Windows 98SE, Me, 2000, and XP Open a command prompt. For Windows 98SE and Me TCP Application Start and End Protocol IP Address EnabledCan’t get the Internet game, server, or application to work Wireless-G Broadband Router with SRX My power LED will not stop flashing To start over, I need to set the Router to factory defaultNeed to upgrade the firmware Firmware upgrade failed, and/or the Power LED is flashingCannot connect to the Internet How do I turn on SRX on my router? My wireless-G speed seems to be slowWhere is the Router installed on the network? Frequently Asked QuestionsIs IPSec Pass-Through supported by the Router? Does the Router support IPX or AppleTalk?How can I block corrupted FTP downloads? What are the advanced features of the Router? What is DMZ Hosting?Will the Router function in a Macintosh environment? Is the Router cross-platform compatible?What Ieee 802.11b features are supported? What is the Ieee 802.11g standard?What is ad-hoc mode? What is infrastructure mode?What is DSSS? What is FHSS? And what are their differences? What is ISM band?What is Spread Spectrum? What is a MAC Address? What is WEP?How do I reset the Router? How do I resolve issues with signal loss?Security Threats Facing Wireless Networks Appendix B Wireless SecuritySecurity Precautions Appendix B Wireless Security Wireless-G Broadband Router with SRX Appendix C Upgrading Firmware Figure C-1 Upgrade FirmwareNetwork Neighborhood/My Network Places Appendix D Windows HelpShared Resources Windows 98SE or Me Instructions Figure E-1 IP Configuration ScreenFor the Router’s Web-based Utility Windows 2000 or XP InstructionsAppendix F Glossary Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Wireless-G Broadband Router with SRX Standards Appendix G SpecificationsModel Storage Temp Limited Warranty Appendix H Warranty InformationFCC Statement Appendix I Regulatory InformationFrance Appendix J Contact Information
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