Filtering Overview; Officeconnect Remote 812 Filtering Capabilities; Filter Classes - 3Com OfficeConnect Remote 812 Cli User's Manual

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HAPTER ANUAL

Filtering Overview

OfficeConnect Remote
812 Filtering
Capabilities

Filter Classes

S
ETUP
Packet filters control inter-network data transmission by accepting or rejecting the
passage of specific packets through network interfaces based on packet header
information. When data packets are received by a network interface such as an
Ethernet (LAN) or WAN port, a packet filter analyzes the packet information using
a set of rules you define. A filter then lets the packet pass through or discards it.
This chapter contains information on the filtering capabilities for your
OfficeConnect Remote 812. It is divided into the following sections:
Filtering Overview

OfficeConnect Remote 812 Filtering Capabilities

Creating Filters


Assigning Filters


Applying Filters


Managing Filters


Filters can provide added security by accepting packets only from specific
addresses or they can be added to reduce network traffic and improve overall
performance. Filters can also be used to approximate spoofing when routers with
different or incompatible spoofing methods are linked over the WAN. Spoofing is
the use of a forged IP source address to circumvent a firewall.
Packet filters control inter-network data transmission by accepting or rejecting the
passage of specific packets through network interfaces based on packet header
information. When data packets are received by a network interface such as an
Ethernet LAN or WAN port, a packet filter analyzes packet header information
against a set of rules you define. A filter then lets the packet pass through or
discards it.
The OfficeConnect Remote 812 provides an extensive set of data and call filtering
capabilities. The OfficeConnect Remote 812 supports the following filtering
capabilities:
Input and output data filtering.


Source and destination address filtering.


Protocol filtering.


Source and destination port filtering. A packet filter can control what services


local or remote users can access.
Call filtering can control whether a packet can initiate an outgoing call.


Route filtering can filter source and destination addresses in packets that


exchange routing table information.
Established session filtering. A packet filter can permit users to connect with a


remote network without letting remote users have access to the local network
(or vice versa).
The OfficeConnect Remote 812 supports three filter classes: