Cabletron Systems CSX100 series, Руководство пользователя, Страница: 111 / 153

Router Feature Descriptions 97
Bridging and Routing Protocol Filtering
Filtering can be used to allow efficient usage of network resources and
provide security for your network and hosts.
IP Internet Firewall
The router supports IP Internet Firewall filtering to prevent unauthorized
access to your system and network resources from the Internet. A security
violation can occur when a packet is received from a WAN link, typically
connected from the Internet, which has the source IP address of a secure host
on your LAN. Using this secure host address, functions can be performed
which only the secure host is authorized to perform. This filter discards
packets received from the WAN which have a source IP address recognized as
a local LAN address.
Note: Most routers’ Firewall implementations protect against one form of
intrusion. The built-in protection Firewall of the router does not take the
place of a professional Firewall system designed to protect against multiple
violations.
Bridge Filtering
Bridge filtering allows a network administrator to control the flow of packets
across the router. Bridge filtering can be used to ‘deny’ or ‘allow’ the
transmission or reception of packets based on a ‘matched pattern’ using a
specified position and hexadecimal content within the packet. Common uses
are to prevent access to remote networks, control unauthorized access to the
local network and limit unnecessary traffic. (This feature is configured
through the Command Line Interface.)
Bandwidth Optimization Features
The router provides a number of features to maximize throughput and
minimize usage of WAN resources.
Data Compression
The router supports data compression of up to 4:1 allowing data transfer rates
over an ISDN line at up to 512Kbps.