3com 812 Manual De Usuario
6-46
C
HAPTER
6: M
ANUAL
S
ETUP
To set the idle timeout period, use the command:
set command idle_timeout <timeout> where <timeout> specifies the idle
timeout period in minutes. By default, there is no idle timeout period.
timeout period in minutes. By default, there is no idle timeout period.
This capability is useful for system administrators or users who wish to restrict
access to the OCR 812.
access to the OCR 812.
Care should be taken to remember the configured password. If the password is
forgotten, the unit must be sent back to 3Com support to have the feature
disabled.
forgotten, the unit must be sent back to 3Com support to have the feature
disabled.
OfficeConnect Remote
812 Filtering
Capabilities
812 Filtering
Capabilities
The OCR 812 provides an extensive set of data and call filtering capabilities. The
OCR 812 supports the following filtering capabilities:
OCR 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.
local or remote users can access.
Route filtering can filter source and destination addresses in packets that
exchange routing table information.
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).
remote network without letting remote users have access to the local network
(or vice versa).
Data Filtering Overview
The OCR 812 provides an extensive set of data filtering capabilities. For instance,
filters can accept packets only from specific addresses to provide added security, or
filters can be added to reduce network traffic and improve overall performance.
filters can accept packets only from specific addresses to provide added security, or
filters can be added to reduce network traffic and improve overall performance.
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.
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 OCR 812
and is organized into the following sections:
and is organized into the following sections:
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.
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.