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Page 121 / 228 Scroll up to view Page 116 - 120
Chapter 8 Quality of Service (QoS)
ericom D1000 modem User’s Guide
121
8.5
The QoS Game List Screen
Use this screen to give priority to traffic for specific games. Click
Network Setting > QoS > Game
List
to open the screen as shown next.
Figure 84
Network Setting > QoS > Game List
IP Precedence
Mark
Enter a range from 0 to 7 to re-assign IP precedence to matched traffic. 0 is the lowest
priority and 7 is the highest.
Type Of
Service Mark
Select a type of service to re-assign the priority level to matched traffic.
Available options are:
Normal service
,
Minimize delay
,
Maximize throughput
,
Maximize reliability
and
Minimize monetary cost
.
DSCP
Mark(0~63)
This field is available only when you select
IP
in the
Ether Type
field.
If you select
Mark
, enter a DSCP value with which the Device replaces the DSCP field in
the packets.
If you select
Unchange
, the Device keep the DSCP field in the packets.
802.1Q Tag
If you select
Remark
, select a priority level (in the
Ethernet Priority
field) and enter a
VLAN ID number (in the
VLAN ID
field) with which the Device replaces the IEEE 802.1p
priority field and VLAN ID of the frames.
If you select
Remove
, the Device deletes the VLAN ID of the frames before forwarding
them out.
If you select
Add
, the Device treat all matched traffic untagged and add a second priority
level and VLAN ID that you specify in the
Ethernet Priority
and
VLAN ID
fields.
If you select
Same
, the Device keep the Ethernet Priority and VLAN ID in the packets.
To configure the Ethernet Priority, you can either select a priority number in the first
drop-down list box (7 is the highest and 0 is the lowest priority) or select an application
from the second drop-down list box which automatically maps to the corresponding
priority number. (Key Net Traffic: 7; Voice: 6; Video: 5;IGMP: 4; Key Data: 3)
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 38
QoS > Class Setup Add/Edit (continued)
LABEL
DESCRIPTION
Page 122 / 228
Chapter 8 Quality of Service (QoS)
ericom D1000 modem User’s Guide
122
The following table describes the labels in this screen.
8.6
QoS Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.6.1
IEEE 802.1p
IEEE 802.1p specifies the user priority field and defines up to eight separate traffic types. The
following table describes the traffic types defined in the IEEE 802.1d standard (which incorporates
the 802.1p).
8.6.2
IP Precedence
Similar to IEEE 802.1p prioritization at layer-2, you can use IP precedence to prioritize packets in a
layer-3 network. IP precedence uses three bits of the eight-bit ToS (Type of Service) field in the IP
header. There are eight classes of services (ranging from zero to seven) in IP precedence. Zero is
the lowest priority level and seven is the highest.
Table 39
Network Setting > QoS > Game List
LABEL
DESCRIPTION
Enable Game List
Select this to have QoS give the highest priority to traffic for the games you specify. This
priority is higher than the other QoS queues.
Select the games below.
Apply
Click this to save your changes.
Cancel
Click this to restore previously saved settings.
Table 40
IEEE 802.1p Priority Level and Traffic Type
PRIORITY
LEVEL
TRAFFIC TYPE
Level 7
Typically used for network control traffic such as router configuration messages.
Level 6
Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in
delay).
Level 5
Typically used for video that consumes high bandwidth and is sensitive to jitter.
Level 4
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network
Architecture) transactions.
Level 3
Typically used for “excellent effort” or better than best effort and would include important
business traffic that can tolerate some delay.
Level 2
This is for “spare bandwidth”.
Level 1
This is typically used for non-critical “background” traffic such as bulk transfers that are allowed
but that should not affect other applications and users.
Level 0
Typically used for best-effort traffic.
Page 123 / 228
Chapter 8 Quality of Service (QoS)
ericom D1000 modem User’s Guide
123
8.6.3
Automatic Priority Queue Assignment
If you enable QoS on the Device, the Device can automatically base on the IEEE 802.1p priority
level, IP precedence and/or packet length to assign priority to traffic which does not match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on the Device. On the
Device, traffic assigned to higher priority queues gets through faster while traffic in lower index
queues is dropped if the network is congested.
Table 41
Internal Layer2 and Layer3 QoS Mapping
PRIORITY
QUEUE
LAYER 2
LAYER 3
IEEE 802.1P USER
PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
IP PACKET
LENGTH (BYTE)
0
1
0
000000
1
2
2
0
0
000000
>1100
3
3
1
001110
001100
001010
001000
250~1100
4
4
2
010110
010100
010010
010000
5
5
3
011110
011100
011010
011000
<250
6
6
4
100110
100100
100010
100000
5
101110
101000
7
7
6
110000
111000
7
Page 124 / 228
Chapter 8 Quality of Service (QoS)
ericom D1000 modem User’s Guide
124
Page 125 / 228
ericom D1000 modem User’s Guide
125
C
HAPTER
9
Network Address Translation (NAT)
9.1
Overview
This chapter discusses how to configure NAT on the Device. NAT (Network Address Translation -
NAT, RFC 1631) is the translation of the IP address of a host in a packet, for example, the source
address of an outgoing packet, used within one network to a different IP address known within
another network.
9.1.1
What You Can Do in the NAT Screens
•
Use the
General
screen (
Section 9.2 on page 126
) to activate/deactivate NAT for the default
WAN connection (PVC0).
•
Use the
Port Forwarding
screen (
Section 9.3 on page 127
) to configure forward incoming
service requests to the server(s) on your local network.
•
Use the
DMZ
screen to configure a default server (
Section 9.4 on page 129
).
•
Use the
ALG
screen to enable and disable the SIP (VoIP) ALG in the Device (
Section 9.5 on page
130
).
9.1.2
What You Need To Know About NAT
Inside/Outside
Inside/outside denotes where a host is located relative to the Device, for example, the computers
of your subscribers are the inside hosts, while the web servers on the Internet are the outside
hosts.
Global/Local
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for
example, the local address refers to the IP address of a host when the packet is in the local
network, while the global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
NAT
In the simplest form, NAT changes the source IP address in a packet received from a subscriber
(the inside local address) to another (the inside global address) before forwarding the packet to the
WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host.

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