Error under ubuntu 18.04

[estebantoribio]

Hi @urbenlegend , I would like to have some help from you. I'm trying to use your tool for a final project.
After running the following command:
sudo python netimpair.py -n ens33 netem --delay 200

Error: Cannot delete qdisc with handle of zero.
Including the following for network impairment:
tc filter add dev ens33 protocol ip parent 1:0 prio 3 u32 match ip src 0/0 flowid 1:3
tc filter add dev ens33 protocol ipv6 parent 1:0 prio 4 u32 match ip6 src ::/0 flowid 1:3

Excluding the following from network impairment:
tc filter add dev ens33 protocol ip parent 1:0 prio 1 u32 match ip dport 22 0xffff flowid 1:2
tc filter add dev ens33 protocol ip parent 1:0 prio 1 u32 match ip sport 22 0xffff flowid 1:2
tc filter add dev ens33 protocol ipv6 parent 1:0 prio 2 u32 match ip6 dport 22 0xffff flowid 1:2
tc filter add dev ens33 protocol ipv6 parent 1:0 prio 2 u32 match ip6 sport 22 0xffff flowid 1:2

Network impairment starting. Press Ctrl-C to restore normal behavior and quit.

Setting network impairment:
tc qdisc change dev ens33 parent 1:3 handle 30: netem loss 0% 0% duplicate 0% delay 200ms 0ms 0% reorder 0% 0%
Illegal "loss percent"
Traceback (most recent call last):
File "netimpair.py", line 295, in main
args.toggle)
File "netimpair.py", line 185, in netem
self._check_call(impair_cmd)
File "netimpair.py", line 58, in _check_call
subprocess.check_call(shlex.split(command))
File "/usr/lib/python2.7/subprocess.py", line 190, in check_call
raise CalledProcessError(retcode, cmd)
CalledProcessError: Command '['tc', 'qdisc', 'change', 'dev', 'ens33', 'parent', '1:3', 'handle', '30:', 'netem', 'loss', '0%', '0%', 'duplicate', '0%', 'delay', '200ms', '0ms', '0%', 'reorder', '0%', '0%']' returned non-zero exit status 1
Network impairment teardown complete.

[urbenlegend]

Okay, I just installed Ubuntu 20.04. I'll look into it when I have time.

[zemaree]

Hi, i have the same issue. look like that with ratio is working and the issue is only when I try to use a netem command.

Would be great if you can take a look and fix it