Cabletron Systems CyberSWITCH CSX101 User's Information Manual

About the CyberSWITCH 100 Router20 CyberSWITCH 100 Advanced User InformationBridging and Routing Protocol FilteringFiltering can be used to allow efficient usage of network resources and provide security for yournetwork and hosts.IP Internet Firewall — The CyberSWITCH 100 supports IP Internet Firewall filtering to preventunauthorized access to your system and network resources from the Internet. A security violationcan occur when a packet is received from a WAN link, typically connected through the Internet,which has the source IP address of a secure host on your LAN. Using this secure host address,functions can be performed that only the secure host is authorized to perform. This filter discardspackets from the WAN which have a source IP address recognized as a local LAN address.Bridge Filtering — Bridge filtering allows a network administrator to control the flow of packetsacross the router. Bridge filtering can be used to “deny” or “allow” packets based on a “matchedpattern” using a specified position and hexadecimal content within the packet. This enablesrestricting or forwarding of messages based on address, protocol or data content. Common usesare to prevent access to remote networks, control unauthorized access to the local network, andlimit unnecessary traffic.Bandwidth Optimization FeaturesThe CyberSWITCH 100 provides a number of features to maximize throughput and minimize useof WAN resources.Data Compression — The CyberSWITCH 100 supports data compression of up to 4:1 allowingdata transfer rates over an ISDN line at up to 512 Kbps (bit rate realized after data decompression).Dial on Demand — Dial-up WAN resources are accessed only when remote access is requiredand released as soon as the resource is no longer needed.Bandwidth on Demand — The CyberSWITCH 100 optimizes the use of WAN resources (i.e.,two ISDN B-channels) to increase throughput, depending on load requirements. Two ISDNB-channels can be “bundled” to permit transmission of data traffic over both channels after a linkutilization threshold is reached. The second channel is released when utilization falls below thethreshold. Support includes both routing and bridging applications. Bandwidth-on-demandmanagement can occur on incoming, outgoing, or in both directions. The Multi-Link Protocol forPPP (MLP) is used to implement this feature.Split B Channels — Each 64 Kbps ISDN B channel can be used individually for a separate dataconnection.