Add Linux script to limit outgoing bandwidth used by Bitcoin

This commit adds a Linux script that uses tc and iptables to
limit outgoing bandwidth to Bitcoin nodes. All tcp connections with
a source or destination port of 8333 are limited to the chosen rate.
It does not alter the incoming bandwidth. Additionally, outgoing
bandwidth to a host on a local LAN (defined by the LOCALNET variable)
is not limited.
This commit is contained in:
Rune K. Svendsen 2013-06-03 12:15:12 +02:00
parent fa9e5adddd
commit 2002bceac5
2 changed files with 44 additions and 0 deletions

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contrib/qos/README Normal file
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This is a Linux bash script that will set up tc to limit the outgoing bandwidth for connections to the Bitcoin network. It limits outbound TCP traffic with a source or destination port of 8333, but not if the destination IP is within a LAN (defined as 192.168.x.x).
This means one can have an always-on bitcoind instance running, and another local bitcoind/bitcoin-qt instance which connects to this node and receives blocks from it.

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contrib/qos/tc.sh Normal file
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#network interface on which to limit traffic
IF="eth0"
#limit of the network interface in question
LINKCEIL="1gbit"
#limit outbound Bitcoin protocol traffic to this rate
LIMIT="160kbit"
#defines the address space for which you wish to disable rate limiting
LOCALNET="192.168.0.0/16"
#delete existing rules
tc qdisc del dev ${IF} root
#add root class
tc qdisc add dev ${IF} root handle 1: htb default 10
#add parent class
tc class add dev ${IF} parent 1: classid 1:1 htb rate ${LINKCEIL} ceil ${LINKCEIL}
#add our two classes. one unlimited, another limited
tc class add dev ${IF} parent 1:1 classid 1:10 htb rate ${LINKCEIL} ceil ${LINKCEIL} prio 0
tc class add dev ${IF} parent 1:1 classid 1:11 htb rate ${LIMIT} ceil ${LIMIT} prio 1
#add handles to our classes so packets marked with <x> go into the class with "... handle <x> fw ..."
tc filter add dev ${IF} parent 1: protocol ip prio 1 handle 1 fw classid 1:10
tc filter add dev ${IF} parent 1: protocol ip prio 2 handle 2 fw classid 1:11
#delete any existing rules
#disable for now
#ret=0
#while [ $ret -eq 0 ]; do
# iptables -t mangle -D OUTPUT 1
# ret=$?
#done
#limit outgoing traffic to and from port 8333. but not when dealing with a host on the local network
# (defined by $LOCALNET)
# --set-mark marks packages matching these criteria with the number "2"
# these packages are filtered by the tc filter with "handle 2"
# this filter sends the packages into the 1:11 class, and this class is limited to ${LIMIT}
iptables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET} -j MARK --set-mark 0x2
iptables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET} -j MARK --set-mark 0x2