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ADSL Gateway
The QoS Tab
QoS
Quality of Service (QoS) ensures better service to high-priority types of network traffic, which may involve
demanding, real-time applications, such as Internet phone calls or videoconferencing.
Enabled/Disabled. To use QoS, select Enabled. Otherwise, keep the default, Disabled.
PVC QoS Priority
PVC-based QoS assigns different levels of priority, or precedence, to different permanent virtual circuits. This is
useful when you have, for example, one PVC set up for traditional Internet services (Web browsing, e-mail, and
the like) and another PVC set up to carry time-sensitive data such as VoIP or IPTV streams. Giving the second PVC
a higher QoS level helps ensure the best possible voice or picture quality.
Edit list of QoS Settings
In addition to PVC-based QoS, you can assign different levels of priority to different packets based on information
in the packets. To do this, click the Edit list of QoS Settings button. A window titled QoS Function will appear.
This window lets you set the priority for packets selected by any of the following criteria, alone or in combination:
• Destination. IP address and Netmask (address mask), FQDM (Fully Qualified Domain Name), or MAC address.
• Source. IP address and Netmask (address mask), or MAC address
• Protocol (Transport). TCP, UDP, or All.
• Dst Port/Scr Port (Destination port and/or source port). If protocol is set to TCP or UDP.
• Ethernet Type. The value in the 13th and 14th octets of an Ethernet frame.
• ALG. Triggering of a particular Application Layer Gateway (FTP, TFTP, H.323, IRC, MMS, GRE, PPTP, or SIP).
• 802.1D User Priority. Presence of a specified IEEE 802.1D user priority marker.
• 802.1Q VID. Presence of a specified IEEE 802.1Q virtual LAN (VLAN) ID.
• Packet length Min/Max. Packet length between specified minimum and maximum numbers of octets.
• Priority. Set the priority of None, Low, Medium, or High.
Chapter 5: Configuring the ADSL Gateway
The Applications & Gaming Tab
Figure 5-31: QoS
Figure 5-32: Edit List of QoS Settings
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