Filtering Capabilities; Filter Classes; Filter Types; Data Filters - 3Com 3C840 User Manual

12-2 C 12: C
HAPTER ONFIGURING
Filtering
Capabilities

Filter Classes

Filter Types

Data Filters

F
ILTERS
The OfficeConnect Remote 840 provides an extensive set of data filtering
capabilities. The OfficeConnect Remote 840 supports the following

filtering capabilities:

Input and output data filtering.
I
Source and destination address filtering.
I
Protocol filtering.
I
Source and destination port filtering. A packet filter can control what
I
services local or remote users can access.
Route filtering can filter source and destination addresses in packets
I
that exchange routing table information.
Established session filtering. A packet filter can permit users to
I
connect with a remote network without letting remote users have
access to the local network (or vice versa).
The OfficeConnect Remote 840 supports three filter classes:
Input data — filter packets as they enter.
I
Output data — filter packets as they exit.
I
Embedded bypass — for periodic router protocol packets (IP RIP, IPX
I
RIP and IPX SAP)
Each filter class can be identified further by the following types:
Filters can be classified by the following types:
Data filters — based on protocol-specific packet information.
I
Advertisement filters — based on broadcast packet information (IP
I
RIP, IPX RIP, and IPX SAP).
Generic filters — based on packet structure.
I
Data filters control network access based on the protocol, source /
destination address, and port designation (e.g., TCP and UDP port
designations) of the packet. The following table describes the data filters
supported.