scripts/test-ns at master · theundefined/scripts · GitHub

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#!/bin/sh
#to test:
#ip netns exec test-1 bash
#ping 192.168.13.200
network=192.168.13

stop(){
for id in `seq 1 127`; do
	idprev=$(( $id - 1))
        ip netns del test-$id;
	ip link del test-$idprev-$id
done;
}

bring(){
 idprev=$1
 id=$2
 ipprev=$(( $idprev * 2 ))
 ip=$(( $idprev * 2 + 1 ))
 ip netns add test-$id
 ip netns exec test-$id ip link set dev lo up
 ip netns exec test-$id sysctl -w net.ipv4.conf.default.forwarding=1
# ip netns exec test-$id sysctl -w net.ipv4.conf.default.hop_limit=255
 ip link add test-$1-$2 type veth peer name test-$2-$1
 [ $idprev -eq 0 ] && ip link set test-$1-$2 up
 [ $idprev -eq 0 ] && ip a a ${network}.$ipprev/31 dev test-$1-$2
 [ $idprev -eq 0 ] && ip r a ${network}.0/24 via ${network}.$ip

 [ $idprev -gt 0 ] && ip link set test-$1-$2 netns test-$idprev up
 [ $idprev -gt 0 ] && ip netns exec test-$idprev ip a a ${network}.$ipprev/31 dev test-$1-$2
 [ $idprev -gt 0 ] && ip netns exec test-$idprev ip r a ${network}.0/24 via $network.$ip
 ip link set test-$2-$1 netns test-$id up
 ip netns exec test-$id ip a a ${network}.$ip/31 dev test-$2-$1
 ip netns exec test-$id ip r a default via ${network}.$ipprev
 ip netns exec test-$id ip r a ${network}.0 via ${network}.$ipprev
}

start() {

for id in `seq 0 127`; do
        bring $id $(( $id + 1 ))
done;
ip a a ${network}.0/31 dev test-0-1
ip r a ${network}.0/24 via ${network}.1
}

case $1 in
	stop)
		stop
		;;
	start)
		start
		;;
	*)
		echo stop or start
		;;
esac