39 lines
1.4 KiB
Bash
39 lines
1.4 KiB
Bash
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#!/bin/bash
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# Load balance multiple internet connections. Requires iproute2, awk and grep.
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# (C) 2016 Tobias Girstmair, isticktoit.net, GPLv2
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# Also useful: speedometer -l -r eth1 -t eth1 -m $(( 1024 * 1024 * 3 / 2 ))
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# Not much user error checking is done - only pass working network connections
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# script needs root to work and at least two interfaces to be useful
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[ $EUID -eq 0 -a $# -ge 2 ] || {
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echo "Usage (as root): $0 iface1[:weight1] iface2[:weight2] ..." >&2
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exit 1
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}
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get_free_tblnum() { # http://stackoverflow.com/a/28702075
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awk -v RS='\\s+' '{ a[$1] } END { for(i = 10; i in a; ++i); print i }'</etc/iproute2/rt_tables
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}
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loadbal() {
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IFS=':' read IFACE WEIGHT <<< "$1"
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TABLE="${IFACE}loadbalance"
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if ! grep -q -w "$TABLE" /etc/iproute2/rt_tables ; then
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echo "$(get_free_tblnum) $TABLE" >> /etc/iproute2/rt_tables
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fi
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MY_IP=$(ip -o -4 addr show $IFACE |awk -F'(\\s|/)+' '{print $4}')
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GW_IP=$(ip route show dev $IFACE | awk '/default/ {print $3}')
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SUBNT=$(ip route show dev $IFACE | awk '/proto kernel/ {print $1}')
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ip route add $SUBNT dev $IFACE src $MY_IP table $TABLE
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ip route add default via $GW_IP table $TABLE
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#ip rule add from $MY_IP table $TABLE
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ip rule add from 127.0.0.1 table $TABLE
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#ip rule add from all table $TABLE
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echo nexthop via $GW_IP dev $IFACE weight ${WEIGHT:-1}
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}
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ip route add default scope global $(for IF in "$@"; do loadbal $IF; done)
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