Cisco E2000 User Manual - Page 27

Linksys E2000 CTS Protection Mode The Router automatically uses CTS (Clear-To-Send) Protection Mode when your Wireless-N and Wireless-G devices are experiencing severe problems and are not able to transmit to the Router in an environment with heavy 802.11b traffic. This option boosts the Router's ability to catch all Wireless-N and Wireless-G transmissions but severely decreases performance. To use this option, keep the default, Auto. To disable this option, select Disabled. Beacon Interval A beacon is a packet broadcast by the Router to synchronize the wireless network. The Beacon Interval value indicates the frequency interval of the beacon. Enter a value between 20 and 65,535 milliseconds. The default value is 100. DTIM Interval This value, between 1 and 255, indicates the interval of the Delivery Traffic Indication Message (DTIM). A DTIM field is a countdown field informing clients of the next window for listening to broadcast and multicast messages. When the Router has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. Its clients hear the beacons and awaken to receive the broadcast and multicast messages. The default value is 1. Fragmentation Threshold This value specifies the maximum size for a packet before data is fragmented into multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation Threshold. Setting the Fragmentation Threshold too low may result in poor network performance. Only minor reduction of the default value is recommended. In most cases, it should remain at its default value of 2346. 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 Request to Send (RTS) threshold size, the RTS/CTS (Clear to Send) mechanism will not be enabled. The Router sends 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 CTS frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value of 2347. Click Save Settings to apply your changes, or click Cancel Changes to clear your changes. Chapter 3: Advanced Configuration Security > Firewall The Firewall screen is used to configure a firewall that can filter out various types of unwanted traffic on the Router's local network. Security > Firewall Firewall SPI Firewall Protection To use firewall protection, keep the default selection, Enabled. To turn off firewall protection, select Disabled. Internet Filter Filter Anonymous Internet Requests This option makes it more difficult for outside users to work their way into your network. This option is enabled by default. Disable it to allow anonymous Internet requests. Filter Multicast The multicasting feature allows for multiple transmissions to specific recipients at the same time. If multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate computers. Select this option to enable the filter. This option is disabled by default. Filter Internet NAT Redirection This option is used to prevent a local computer from using a URL or Internet address to access the local server. Select this option to enable the filter. This option is disabled by default. Filter IDENT (Port 113) The Filter IDENT (Identification) option keeps port 113 from being scanned by devices outside of your local network. This option is enabled by default. Disable it to allow port 113 to be scanned. Web Filter Proxy Use of WAN proxy servers may compromise the Gateway's security. Denying Proxy will disable access to any WAN proxy servers. Select this option to enable proxy filtering. Deselect the option to allow proxy access. Advanced Wireless-N Router 27