Dear Members First of all thank you for the amazing idea that CoDel is :) I have downloaded CoDel from https://github.com/dtaht/ns2 In fact I downloaded everything as a zip so that if CoDel needs some other files in the directory I wouldn't miss them out. However, I have been trying to run ns codel.tcl on the my shell. My linux kernel version is 3.6. It gives the following error ftps 1 webrate 0 cbrs 0 bw 3000000.0 filesize 10000000 reverse 0 accessdly 20 bneckdly 10 realrtt 100 bneckbw 3000000.0 invalid command name "Queue/CoDel" while executing "Queue/CoDel set target_ $target" (file "codel.tcl" line 143) A little help will be highly appreciated. -- Regards Safa Nasir