Safa, In the CoDel.tcl from Dave's git repo, the line your code is choking on is 210 not 143, did you modify CoDel.tcl? Also, did you rebuild ns after downloading the CoDel updates? It sounds like ns doesn't know about the queue type CoDel but it is in the makefile.in so it should if you did cd /ns2/ ./configure; make; after downloading and unpacking the zip. -Joey Sent from my iPhone On May 31, 2013, at 5:17 AM, "safa khan" > wrote: 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 _______________________________________________ Codel mailing list Codel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/codel