Filter Classes; Filter Types; Data Filters - 3Com OfficeConnect 3CP4144 Cli User's Manual

OfficeConnect Remote
812 Filtering
Capabilities

Filter Classes

Filter Types

Data Filters

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:
Input data - filter packets as they enter.
Output data - filter packets as they exit.
Embedded bypass for periodic router protocol packets (IP RIP, IPX 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.
Advertisement filters - based on broadcast packet information (IP RIP, IPX RIP,
and IPX SAP).
Generic filters - based on packet structure.
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.
Table 6-1 Data Filters
Filter Action
OfficeConnect Remote 812 Filtering Capabilities 6-27