Monitoring QoS with TCPDUMP
July 14th, 2009
To monitor the AF31 class you could use the following filter:
tcpdump -i eth0 -nn ip[1]=0x68
This command will show all AF31 traffic. For other classes:
AF11 = '001010', AF12 = '001100', AF13 = '001110', AF21 = '010010', AF22 = '010100', AF23 = '010110', AF31 = '011010', AF32 = '011100', AF33 = '011110', AF41 = '100010', AF42 = '100100', AF43 = '100110'.