Pirelli VoIP-AG-v1-t-Annex-A-OT Router Manual PDF (Setup & Configuration Guide)

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DISCUS™ Multiplay Wireless VoIP AG

80

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Voice over IP Section

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Quality of Service Section

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Quality of

Service Section

This chapter will describe the

Quality of Service Section

accessible

from the

Home Page

of the

DISCUS™ Multiplay Wireless VoIP AG

.

Quality of Service refers to the capability of a network device to pro-

vide better service to selected network traffic. This is achieved by

processing higher priority traffic before lower priority traffic.

As Quality of Service is dependent on the "weakest link in the chain",

failure of a single component along the data path can easily cause a

VoIP call or a Video on Demand (VoD) broadcast to fail miserably.

QoS must therefore obviously be addressed end-to-end.

GENERAL

The 'General' tab provides a Quality of Service "wizard", with which

you can configure your QoS parameters according to predefined pro-

files, with just a few clicks. A chosen QoS profile will automatically

define QoS rules, which you can view and edit in the rest of the QoS

tab screens.

WAN Devices Bandwidth (Rx/Tx).

Before selecting the QoS profile

that mostly suits your needs, select your bandwidth from this combo-

box. If you do not see an appropriate entry, select 'User Defined', and

enter your Tx and Rx bandwidths manually.

Be aware that any configuration changes could compromise your connectivity.

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Quality of Service Section

Tx Bandwidth.

Enter your Tx bandwidth in Kbits per second.

Rx Bandwidth.

Enter your Rx bandwidth in Kbits per second.

QoS Profiles.

Select the profile that mostly suits your bandwidth usage. Each

profile entry displays a quote describing what the profile is best used for, and

the QoS priority levels granted to each bandwidth consumer in this profile.

•

Default: No QoS preferences

•

P2P User: Peer-to-peer and file sharing applications will receive priority

•

Triple Play User: VoIP and video streaming will receive priority

•

Home Worker: VPN and browsing will receive priority

•

Gamer: Game-related traffic will receive priority

•

Priority By Host: This entry provides the option to configure which computer in your LAN will

receive the highest priority and which the lowest. If you have additional computers, they will

receive medium priority.

- High Priority Host: enter the host name or IP address of the computer to which you would like

to grant the highest bandwidth priority.

- Low Priority Host: enter the host name or IP address of the computer to which you would like

to grant the lowest bandwidth priority.

FIGURE 1.

General Panel

TRAFFIC PRIORITY

Traffic Priority allows you to manage and avoid traffic congestion by defining

inbound and outbound priority rules for each device on your gateway. These

rules determine the priority that packets, traveling through the device, will

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Quality of Service Section

receive. QoS parameters (DSCP marking and packet priority) are set per

packet, on an application basis.

You can set QoS parameters using flexible rules, according to the following

parameters:

•

Source/destination IP address, MAC address or host name

•

Device

•

Source/destination ports

•

Limit the rule for specific days and hours

The Router supports two priority marking methods for packet prioritization:

•

DSCP

•

802.1p Priority

The matching of packets by rules is connection-based, known as Stateful

Packet Inspection (SPI). Once a packet matches a rule, all subsequent packets

with the same attributes receive the same QoS parameters, both inbound and

outbound.

A packet can match more than one rule. Therefore:

•

The first class rule has precedence over all other class rules (scanning is stopped once the first

rule is reached).

•

The first traffic-priority (classless) rule has precedence over all other traffic-priority rules.

•

There is no prevention of a traffic-priority rule conflicting with a class rule. In this case, the prior-

ity and DSCP setting of the class rule (if given) will take precedence.

Connection-based QoS also allows inheriting QoS parameters by some of the

applications that open subsequent connections. For instance, you can define

QoS rules on SIP, and the rules will apply to both control and data ports (even if

the data ports are unknown):

•

SIP

•

MSN Messenger/Windows Messenger

•

TFTP

•

FTP

•

MGCP

•

H.323

•

Port Triggering applications

•

PPTP

•

IPSec

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Quality of Service Section

FIGURE 2.

Traffic Priority Panel

To set traffic priority rules:

1.

Click 'Traffic Priority' under the 'QoS' tab in the 'Services' screen. The 'Traffic

Priority' screen will appear. This screen is divided into two identical sections,

one for 'QoS input rules' and the other for 'QoS output rules', which are for

prioritizing inbound and outbound traffic, respectively. Each section lists all

the gateway devices on which rules can be set. You can set rules on all

devices at once, using the 'All devices' entry.

2.

After choosing the traffic direction and the device on which to set the rule,

click the appropriate New Entry link. The 'Add Traffic Priority Rule' screen will

appear.

This screen is divided into two main sections, 'Matching' and 'Operation', which

are for defining the operation to be executed when matching conditions apply.

-

Matching:

Use this section to define the rule's conditions, which are the LAN

computer's parameters to be matched.

-

Operation:

Set rule priority with Quality of Service.

3.

Click 'OK' to save the settings.

TRAFFIC SHAPING

Traffic Shaping is the solution for managing and avoiding congestion where a

high speed LAN meets limited broadband bandwidth. A user may have, for

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