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Section 3 – Configuration
D-Link DSL-2542B User Manual
31
Application Rules
To access the
Application Rules
window, click the
Application Rules
button in the
Advanced
directory.
Some applications require that the remote parties open specific ports in
the Router’s firewall for access. Port Trigger dynamically opens the Open
Ports in the firewall when an application on the LAN initiates a TCP/UDP
connection to a remote party using Trigger Ports. The Router allows the
remote party form the WAN side to establish new connections back to the
application on the LAN side using the Open Ports.
Applications such as games, video conferencing, and other remote
access applications require that specific ports in the Router’s firewall be
opened for access by applications.
You can configure the port settings on this window by clicking the “Select
an application“ radio button and then using the drop-down menu to
choose an existing application, or by clicking the “Custom
application“ radio button and entering your own Application Rule in the
field provided. Click
Apply Settings
when you are finished with the port
setting configuration. The new Application Rule will appear in the Active
Application Rules table at the bottom of the window.
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Section 3 – Configuration
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32
QoS Setup
.
To access the
QoS Setup
window, click the
QoS Setup
button in the
Advanced
directory.
QoS or Quality of Service allows your Router to help prioritize the data
packet flow in your Router and network. This is very important for time
sensitive applications such as VoIP where it may help prevent dropped
calls. Large amounts of non-critical data can be scaled so as not to affect
these prioritized sensitive real-time programs.
The Router allows you to either tick the Auto Detection check box to
automatically detect real-time streaming to prioritize entire packets
(default), or to manually configure IP QoS based on
ToS
,
Application
, and
User Define
classifications. D-Link recommends you leave Auto Detection
enabled.
Selecting
ToS
in the Classify drop-down menu will display the following
window:
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33
ToS
From this window, you can use the Bandwidth drop-down menu to select
the desired value of bandwidth, in kbps, that will be divided up among the
four priority queues. Input a Weight, in percentage, and a Range from
0
to
7
. Tick the Enable check box for each queue configured. Some
experimentation may be necessary to achieve the optimum results with
your particular ISP’s connection. When you are finished, click
Apply
Settings
and then click the
Reboot
button to let your new settings take
effect.
Selecting
Application
in the Classify drop-down menu will display the
following window:
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34
Application
On this window, you can select the mechanism by which the four priority
queues are emptied by assigning a Weight, in percentage terms, to each
priority queue, and then selecting the associated Application Type. Tick
the Enable check box for each queue configured. Some experimentation
may be necessary to achieve the optimum results with your particular
ISP’s connection. When you are finished, click
Apply Settings
and then
click the
Reboot
button to let your new settings take effect.
Selecting
User Define
in the Classify drop-down menu will display the
following window:
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35
User Define
On this window, you can assign a Weight, on a percentage basis, to each
of the four priority queues. In addition, you can specify the number of
bytes from the beginning of a given packet’s IP header to set a pointer.
From this pointer, you can then specify a Value (in hexadecimal) and a
Mask (in hexadecimal) for the Router to match when examining packets
crossing the specified priority queue. It is recommended that you not enter
a QoS scheme of this type unless you fully understand Offsets, pointers,
masks, and IP headers or you are instructed to do so by your ISP. When
you are finished, click
Apply Settings
and then click the
Reboot
button to
let your new settings take effect.
Here’s an example of some typical User Defined IP QoS values:
Packet
Value
Mask
IP Header Offset
IGMP
0x02
0xff
9
FTP
0x0015
0xffff
22 (destination port)
0xc0a80101
0xffffffff
12
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