D-Link DFL-260 Product Manual - Page 467

A P2P Scenario, Excluding Hosts

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10.2.5. A P2P Scenario Chapter 10. Traffic Management Excluding Hosts To avoid these unintended consequences, we specify the IP addresses of client A and client B in the Network range but not host X. This tells NetDefendOS that host X is not relevant in making a decision about including new non-IDP-triggering connections in traffic shaping. It may seem counter-intuitive that client B is also included in the Network range but this is done on the assumption that client B is a user whose traffic might also have to be traffic shaped if they become involved in a P2P transfer. If Network is not specified then any connection involving either client A or host X will be subject to traffic shaping and this is probably not desirable. 10.2.5. A P2P Scenario The schematic below illustrates a typical scenario involving P2P data transfer. The sequence of events is: • The client with IP address 192.168.1.15 initiates a P2P file transfer through a connection (1) to the tracking server at 81.150.0.10. • This connection triggers an IDP rule in NetDefendOS which is set up with an IDP signature that targets the P2P application. • The Pipe action in the rule sets up a traffic shaping pipe with a specified capacity and the connection is added to it. • A subsequent connection (2) to the file host at 92.92.92.92 occurs within the IDP rule's Time Window and its traffic is therefore added to the pipe and is subject to shaping. • The client network to which 192.168.1.15 belongs, should ideally be included in the Network address range for the IDP rule. Figure 10.8. IDP Traffic Shaping P2P Scenario 467

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Excluding Hosts
To avoid these unintended consequences, we specify the IP addresses of client
A
and client
B
in the
Network
range but not host
X
. This tells NetDefendOS that host
X
is not relevant in making a
decision about including new non-IDP-triggering connections in traffic shaping.
It may seem counter-intuitive that client
B
is also included in the
Network
range but this is done on
the assumption that client
B
is a user whose traffic might also have to be traffic shaped if they
become involved in a P2P transfer.
If
Network
is not specified then any connection involving either client
A
or host
X
will be subject to
traffic shaping and this is probably not desirable.
10.2.5. A P2P Scenario
The schematic below illustrates a typical scenario involving P2P data transfer. The sequence of
events is:
The client with IP address
192.168.1.15
initiates a P2P file transfer through a connection
(1)
to
the tracking server at
81.150.0.10
.
This connection triggers an IDP rule in NetDefendOS which is set up with an IDP signature that
targets the P2P application.
The
Pipe
action in the rule sets up a traffic shaping pipe with a specified capacity and the
connection is added to it.
A subsequent connection
(2)
to the file host at
92.92.92.92
occurs within the IDP rule's
Time
Window
and its traffic is therefore added to the pipe and is subject to shaping.
The client network to which
192.168.1.15
belongs, should ideally be included in the
Network
address range for the IDP rule.
Figure 10.8. IDP Traffic Shaping P2P Scenario
10.2.5. A P2P Scenario
Chapter 10. Traffic Management
467