Protocol: Select the supported protocol from the drop down list.
DSCP Marking: Differentiated Services Code Point (DSCP), it is the first 6 bits in the ToS byte.
DSCP Marking allows users to classify the traffic of the application to be executed according to the
DSCP value.
IP Precedence and DSCP Mapping Table
Mapping Table
EF(101110)
Expedited Forwarding
AF11 (001010)
Assured Forwarding Class1(L)
AF12 (001100)
Assured Forwarding Class1(M)
AF13 (001110)
Assured Forwarding Class1(H)
AF21 (010010)
Assured Forwarding Class1(L)
AF22 (010100)
Assured Forwarding Class1(M)
AF23 (010110)
ng Class1(H)
AF31 (011010)
Assured Forwarding Class1(L)
AF32 (011100)
Assured Forwarding Class1(M)
AF33 (011110)
Assured Forwarding Class1(H)
AF41 (100010)
Assured Forwarding Class1(L)
AF42 (100100)
Assured Forwarding Class1(M)
AF43 (100110)
Forwarding Class1(H)
CS1(001000)
Class Selector(IP precedence)1
CS2(010000)
Class Selector(IP precedence) 2
CS3(011000)
Class Selector(IP precedence)3
CS4(100000)
Class Selector(IP precedence) 4
CS5(101000)
Class Selector(IP precedence) 5
CS6(110000)
Class Selector(IP precedence) 6
CS7(111000)
Class Selector(IP precedence) 7
DSCP offers three levels of service, Class Selector (CS), Assured Forwarding (AF) and Expedited
Forwarding (EF). AF1, AF2, AF3 and AF4 are four levels of assured forwarding services. Each AF
has three different packet loss priorities from high, medium, to low. Also, CS1-CS7 indicates the IP
precedence.
Rate Type: You can choose Limited , Prioritization or Set DSCP Marking.
Limited (Maximum): Specify a limited data rate for this policy. It also is the maximum rate
for this policy. When you choose Limited, type the Ratio proportion. As above FTP server
example, you may want to “throttle” the outgoing FTP speed to 20% of 256K and limit to it,
you may use this type.
Prioritization: Specify the rate type control for the rule to be used. If you choose
Prioritization for the rule, you parameter Priority would be available, you can set the priority
for this rule.
Set DSCP Marking: When select Set DSCP Marking, the packets matching the rule will be
forwarded according to the pre-set DSCP marking.
Ratio: The rate percent of each application/policy compared to total traffic on the interface with
limited rate type. For example, we want to only allow 20% of the total data for the LAN-to-WAN
direction to be used for FTP server. Then we can specify here with data ratio = 20. If you have ADSL
LINE with 256K/bps.rate, the estimated data rate, in kbps, for this rule is 20%*256*0.9 = 46kbps.
(For 0.9 is an estimated factor for the effective data transfer rate for an ADSL LINE from LAN to
WAN. For WAN-to-LAN, it is 0.85 to 0.8)
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