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@Hritik14
Last active May 8, 2022
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Multipath routing to increase bandwith
#!/bin/bash
# (C) Hritik Vijay
# License: GPLv2
# Suppliment to https://m47r1x.github.io/posts/multi-net/
tmp=$(mktemp multi-net-ip-XXXX --tmpdir)
TIMEOUT=5
Table=200
_ping(){
echo "Wait $1 seconds "
init=$(date +%s)
curr=$init
until [ $(($curr-$init)) -ge "$1" ]; do
curl -s -m $1 "ipecho.net/plain" >> "$tmp"
echo >> "$tmp"
echo -n .
curr=$(date +%s)
done
echo
}
trap "rm $tmp && rm -f $tmp.uniq" EXIT
#----------------------main-------------------#
# Need root
if [ "$(id -u)" -ne 0 ]; then
echo "[!] Root required"
exit
fi
route_cmd="ip route add default scope global "
echo "[*] Scanning interfaces"
# Iterate through each interface and process them
count=0
while read -r line; do
P=$(echo $line | grep -Eo 'via [0-9\.]+ ' | cut -d " " -f 2)
IF=$(echo $line | grep -Eo 'dev [A-Za-z0-9]+ ' | cut -d " " -f 2)
ip=$(ip -br address show dev "$IF" | tr -s ' ' | cut -d " " -f 3)
IP=${ip%%/*} P_NET=$P # Assumption
# Init table
ip route add "$P_NET" dev "$IF" src "$IP" table $Table
ip route add default via "$P" table $Table
# Match connections on proper interfaces
ip rule add from "$IP" table $Table
# add nexthop
route_cmd="$route_cmd nexthop via $P dev $IF weight 1 "
# a new table
Table=$((Table+1))
echo "[*] Processed $IF"
count=$((count+1))
done < <(ip route list default)
if [ $count -lt 2 ]; then
echo "[!] Please connect at least two internet links. Aborted."
exit
fi
echo "[*] Creating multipath route"
eval "$route_cmd"
echo "[*] Verifying"
_ping $TIMEOUT
sort "$tmp" | uniq > "$tmp.uniq"
if [ $(wc -l "$tmp.uniq" | cut -f 1 -d " ") -gt 1 ]; then
echo "[*] Success ! Your public IPs: "
cat "$tmp.uniq"
else
echo "[!] Failed"
fi
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