TOS Modification
TOS (Type of Service) and DSCP (Differentiated Service CodePoint) are two ways of telling network equipment how to treat and prioritize packets. TOS and DSCP are two different standards and cannot be used simultaneously.
For more information about TOS, read RFC 791 & 795. For more information about DSCP, read RFC 2474.
On this page, you can set the TOS or DSCP value for outgoing packets in a class.
Class
Select a class for which the packets should be modified. Select from the classes defined on the QoS Classes page.
TOS octet
TOS
Select a new TOS value for packets in this class. Select between Empty (no TOS bit set), MD (Minimize Delay; the packet is forwarded as quickly as possible), MT (Maximize Throughput; data throughput is maximized), and MR (Maximize Reliability; data is forwarded as reliably as possible). If the packet should have a DSCP value instead, select "-" here.
DSCP
Enter a new DSCP value for packets in this class. The DSCP field has 6 bits, which means that only the numbers 0-63 (inclusive) are possible to set for this field.
In addition to this, only some of the numbers are valid values for the DSCP field. There is also no simple linear scale of the type "a larger value means a higher priority". Do not enter a value in this field if you do not know that the value is valid.
Delete row
If you select this box, the row is deleted when you click on Add new rows or Save.
Add new rows
Enter the number of new rows you want to add to the table, and then click on Add new rows.
Save
Saves the TOS Modification configuration to the preliminary configuration.
Undo
Clears and resets all fields in new rows and reset changes in old rows.