Created
July 5, 2017 00:31
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| #!/bin/bash | |
| set -x | |
| set -e | |
| # This sets up QoS using HTB, which is a simplified algorithm. How it works is | |
| # that I set up three classes, each class gets a guaranteed rate ('rate') and | |
| # a maximum-usable rate ('ceil'). The ceiling is set to my uplink rate, so | |
| # any class can use the full pipe assuming no better class trumps it. | |
| # | |
| # The classes are: | |
| # Class 10 - high prio (interactive, SSH, etc.) | |
| # Guaranteed 90% of the uplink rate | |
| # Class 20 - default | |
| # Guaranteed 50% of the uplink rate | |
| # Class 30 - bulk (torrent, usenet) | |
| # Guaranteed 10% of the uplink rate | |
| # | |
| # Largely based on the info here: | |
| # http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm | |
| # | |
| # Remember that we can only control what we _send_, not what we receive. | |
| # I'm crossing my fingers that inbound hogs will get throttled if their | |
| # TCP ACKs are getting throttled. | |
| UPLINK_IFACE=eth0 | |
| UP_KBPS=3000 | |
| # Calculated rates for each class | |
| CLASS10_RATE=$(echo "scale=0; $UP_KBPS * 0.9 / 1" | bc) | |
| CLASS20_RATE=$(echo "scale=0; $UP_KBPS * 0.5 / 1" | bc) | |
| CLASS30_RATE=$(echo "scale=0; $UP_KBPS * 0.1 / 1" | bc) | |
| tc qdisc del dev $UPLINK_IFACE root || true | |
| tc qdisc add dev $UPLINK_IFACE root handle 1: htb default 20 | |
| # Handle - the parent of each of the classes. Gotta have at least one of these in the tree. | |
| # If you don't have a handle that the classes child off of, then the classes won't be able | |
| # to 'borrow' from other classes and won't use the full available bandwidth when no one | |
| # else is using it. | |
| tc class add dev $UPLINK_IFACE parent 1: classid 1:1 htb rate "${UP_KBPS}kbit" burst 15k | |
| # Set up each of the classes | |
| tc class add dev $UPLINK_IFACE parent 1:1 classid 1:10 htb rate "${CLASS10_RATE}kbit" ceil "${UP_KBPS}kbit" burst 15k | |
| tc class add dev $UPLINK_IFACE parent 1:1 classid 1:20 htb rate "${CLASS20_RATE}kbit" ceil "${UP_KBPS}kbit" burst 10k | |
| tc class add dev $UPLINK_IFACE parent 1:1 classid 1:30 htb rate "${CLASS30_RATE}kbit" ceil "${UP_KBPS}kbit" burst 5k | |
| # Use SFQ (fair queueing) for all traffic within a particular class | |
| tc qdisc add dev $UPLINK_IFACE parent 1:10 handle 10: sfq perturb 10 | |
| tc qdisc add dev $UPLINK_IFACE parent 1:20 handle 20: sfq perturb 10 | |
| tc qdisc add dev $UPLINK_IFACE parent 1:30 handle 30: sfq perturb 10 | |
| # Finally add some basic filters to match packets to classes | |
| FILTER_PRE="tc filter add dev $UPLINK_IFACE parent 1:0 prio 1 u32" | |
| # SSH | |
| $FILTER_PRE match ip dport 22 0xffff flowid 1:10 | |
| # BitTorrent | |
| $FILTER_PRE match ip dport 6881 0xffff flowid 1:30 |
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