Stef and all, I got error sometimes, dmesg results like this: HTB: quantum of class 10011 is small. Consider r2q change.<4>HTB: quantum of class 10012 is small. Consider r2q change.<4>HTB: quantum of class 10013 is small. Consider r2q change.<4>HTB: quantum of class 10014 is small. Consider r2q change.<4>HTB: quantum of class 10015 is small. Consider r2q change.<4>HTB: quantum of class 10016 is small. Consider r2q change.<4>HTB: quantum of class 10017 is small. Consider r2q change.<4>HTB: quantum of class 10018 is small. Consider r2q change.<4>HT Is this happened because i set QUANTUM value too low ? i set 1000. Why it cannot set below MTU size (1500) ? Regards, Rio Martin.