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Trend Micro InterScan Gateway Security Appliance M-Series Administrator’s Guide 2-16 WARNING! In order for this kind of “failover” to work, LAN bypass must be disabled (enabled by default) and Link state failover must be enabled (disabled by default). LAN Bypass and Link State Failover Settings In the Preconfiguration console, LAN bypass must be disabled and Link state failover must be enabled in order for a load-balancing “failover” deployment to work. LAN Bypass LAN bypass is a feature by which, if the appliance encounters an error that causes scanning to stop, network traffic will still flow through the appliance unscanned, so that network traffic is not interrupted (enabled by default). Link State Failover Link state failover is a feature by which, if either the INT or the EXT port stops functioning, both ports are automatically shut down (disabled by default). Setting LAN Bypass and Link State Failover Options If you have previously enabled LAN bypass, you can disable it through the InterScan Gateway Security Appliance Preconfiguration console. Likewise, you can enable link state failover on the same screen of the Preconfiguration console. See Appendix C. Technology Reference, Enabling or Disabling LAN Bypass and Link State Failover on page C-5 for details.
Deployment Options Deployment Recommendations Figure 2-11 below shows the recommended deployment setup for the appliance. Client Switch Proxy server FIGURE 2-11. Recommended position of InterScan Gateway Security Appliance and other network devices in single- or multi-segment environments Router Internet To minimize issues and speedily complete deployment, deploy the appliance: • Between a firewall that leads to the public network and a router, switch, or hub that leads to the protected segment of the local area network. Connect a router, switch, or hub to the INT port, thereby creating a protected network. Connect the EXT port to a device that leads to the public network or Internet. • Before a proxy server leading to the public network. If deploying in a multi-segment environment, take note of the following recommendations: • Connect the default gateway to the EXT port. • Use the same default gateway setting for both the appliance and the router that connects the appliance to the segments. • Using the Web console, add the static routes for each segment to the appliance. • Disable the proxy settings from the HTTP URL Filtering screen if traffic is not passing through the appliance. Refer to Deployment Issues on page 2-18 to learn about the known deployment issues in this release. For details about single and multi-segment deployment topologies, see Deploying in a Single Network Segment on page 2-4 and Deploying in a Network with Multiple Segments on page 2-5. 2-17
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