Every now and again I need to lookup an IP ToS or DSCP value and I spend a good couple of minutes hunting for a table that contains all the different values. In some situations the ToS field might have an ECN (Explicit Congestion Notification) flag set which will alter the ToS value but keep the DSCP value unchanged. Instead of looking everytime, I decided to put together a table and keep it online for future reference.
In the spirit of sharing information, I have made it available for the benefit of anyone who wants a lookup table with all the different values. It contains a lookup between “IP Precedence”, “DSCP” and “ToS” with decimal, hexadecimal and binary representation.
Clicking on the image below will open up a new window containing the actual table.General QoS