Initial Vexta Core v0.1.0 release

contrib/qos/README.md

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+### QoS (Quality of service) ###
+
+This is a Linux bash script that will set up tc to limit the outgoing bandwidth for connections to the DigiByte network. It limits outbound TCP traffic with a source or destination port of 8333, but not if the destination IP is within a LAN.
+
+This means one can have an always-on digibyted instance running, and another local digibyted/digibyte-qt instance which connects to this node and receives blocks from it.

contrib/qos/tc.sh

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+# Copyright (c) 2017 The Bitcoin Core developers
+# Copyright (c) 2017-2019 The DigiByte Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+#network interface on which to limit traffic
+IF="eth0"
+#limit of the network interface in question
+LINKCEIL="1gbit"
+#limit outbound DigiByte protocol traffic to this rate
+LIMIT="160kbit"
+#defines the IPv4 address space for which you wish to disable rate limiting
+LOCALNET_V4="192.168.0.0/16"
+#defines the IPv6 address space for which you wish to disable rate limiting
+LOCALNET_V6="fe80::/10"
+
+#delete existing rules ('Error: Cannot delete qdisc with handle of zero.' means there weren't any.)
+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 ${IF} parent 1: protocol ip prio 2 handle 2 fw classid 1:11
+
+if [ -n "${LOCALNET_V6}" ] ; then
+	# v6 cannot have the same priority value as v4
+	tc filter add dev ${IF} parent 1: protocol ipv6 prio 3 handle 1 fw classid 1:10
+	tc filter add dev ${IF} parent 1: protocol ipv6 prio 4 handle 2 fw classid 1:11
+fi
+
+#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_V4 and $LOCALNET_V6)
+#	--set-mark marks packages matching these criteria with the number "2" (v4)
+#	--set-mark marks packages matching these criteria with the number "4" (v6)
+#	these packets 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_V4} -j MARK --set-mark 0x2
+iptables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V4} -j MARK --set-mark 0x2
+
+if [ -n "${LOCALNET_V6}" ] ; then
+	ip6tables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
+	ip6tables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
+fi