Web Configuration
D-Link DSL-2600U User Manual
48
QoS-DSCP Setting
In order to understand what is differentiated services code point (DSCP), you should be familiar with the differentiated services model (Diffserv).
Diffserv is a class of service (CoS) model that enhances best-effort Internet services via differentiating traffic by users, service requirements and other criteria. Packets are
specifically marked, allowing network nodes to provide different levels of service,
via priority queuing or bandwidth allocation, or by choosing dedicated routes for specific traffic flows.
As displayed in following diagram, the IPV4 packet has a TOS filed. Diffserv defines TOS field in IP packet headers referred to as DSCP. Hosts or routes that pass traffic to
a Diffserv-enabled network typically mark each transmitted packet with an appropriate DSCP. The DSCP markings are used by Diffserv network routers to appropriately
classify packets and to apply particular queue handing or scheduling behavior.
Layer 3 IPV4 packet
Vers
ion/l
engt
h
TO
S (1
wor
d)
len
gth
I
D
Off
set
/ma
rk
T
T
L
proto
col
Che
ck
sum
IP-
SA
IP
-D
A
d
a
t
a
TOS filed-IP priority (TOS front 3 bit) or DSCP (front 6 bit)
7 6 5 4 3 2 1 0
IP priority Undefined
DSCP Flow control
For example, mark each transmitted ICMP packet which passes traffic to 0-35class with an
appropriate DSCP (CS1).
After proper modifications, click Save/Apply and the following page appears.
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