I have asked this on http://unix.stackexchange.com/questions/154144/, and even offered a bounty, but nobody was able to answer me (if you want the bounty, go there and grab it fast ;) Based on this section of the Linux Advanced Routing & Traffic Control HOWTO: http://lartc.org/howto/lartc.ratelimit.single.html, I can't get tc to limit the network speed in my computer. Basically, I have 13 machines in the network, and this particular machine sometimes steals all traffic available. The router is a Motorola SurfBoard modem with a few routing capabilities and firewall. The machine I want to limit the traffic is 192.168.0.5, and also the script is being run from 192.168.0.5. Here is my adaption of the commands in the HOWTO for /etc/NetworkManager/dispatcher.d/: #!/bin/sh -eu # clear any previous queuing disciplines (qdisc) tc qdisc del dev wlan0 root 2>/dev/null ||: # add a cbq qdisc; see `man tc-cbq' for details if [ $2 = up ]; then # set to a 3mbit interface for more precise calculations tc qdisc add dev wlan0 root handle 1: cbq avpkt 1000 \ bandwidth 3mbit # leave 30KB (240kbps) to other machines in the network tc class add dev wlan0 parent 1: classid 1:1 cbq \ rate 2832kbit allot 1500 prio 5 bounded isolated # redirect all traffic on 192.168.0.5 to the previous class tc filter add dev wlan0 parent 1: protocol ip prio 16 \ u32 match ip dst 192.168.0.5 flowid 1:1 # change the hashing algorithm every 10s to avoid collisions tc qdisc add dev wlan0 parent 1:1 sfq perturb 10 fi The problem is that I have tried setting 2832kbit to very small values for testing (like 16kbit), but I still can browse the web at high speed. The problem is not in NetworkManager, because I'm testing the script manually. Also, tc doesn't return any errors. I have found that by changing dst 192.168.0.5 to src 192.168.0.5, the upload speed is reliably limited, but I still haven't figured how to get the download speed to work, which is the most important for me. The following approach I have taken from wondershaper: tc qdisc add dev wlan0 handle ffff: ingress tc filter add dev wlan0 parent ffff: protocol ip prio 50 u32 match ip \ dst 192.168.0.5 police rate 200kbps burst 10k drop flowid :1 But the problem with this one is that it is very unreliable, it results in unstable download speeds (if set to 200, it downloads at ~80-120). Thank you! Teresa and Junior -- To unsubscribe from this list: send the line "unsubscribe lartc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
