docker-net-test.sh

#!/bin/bash

clear

echo "configure for my network settings"
netDev="wlp3s0"
netPrefix="192.168.0"
macNet="fritz"
shimDev="${macNet}0"
ipHost="35"
ipShim="130"
ipGateway="1"
theInternet="8.8.8.8"
timeToSettle=3

echo "some sources say promisc mode on '$netDev' is neccessary"
sudo ip link set $netDev promisc on

echo "create"
echo -n " * macvlan network '$macNet': "
docker network create -d macvlan -o parent=$netDev \
    --subnet=${netPrefix}.0/24 \
    --gateway=${netPrefix}.$ipGateway \
    --aux-address="$shimDev=${netPrefix}.${ipShim}" \
    --ip-range=${netPrefix}.128/26 \
    $macNet

echo -n " * checker container: "
docker run -dit --name container --net $macNet alpine ash
echo -n " * sibling container: "
docker run -dit --name nginx --net $macNet nginx

echo -n " * shimInterface '$shimDev' "
sudo ip link add $shimDev link $netDev type macvlan mode bridge && \
sudo ip addr add ${netPrefix}.130/26 dev $shimDev && \
sudo ip link set $shimDev up && \
# # sudo ip addr add ${netPrefix}.150/32 dev $shimDev && \
# sudo ip link set $shimDev up && \
# sudo ip route add ${netPrefix}.128/26 dev $shimDev && \
echo "up"

while [[ $timeToSettle -ge 0 ]]
do
    printf "\rgive everything some time to settle (%2dsec)" $timeToSettle
    sleep 1s
    let timeToSettle=$timeToSettle-1
done
echo ""

echo -n "cmp external and internal IP of the checker container: "
containerIP=$(docker inspect -f "{{ .NetworkSettings.Networks.${macNet}.IPAddress }}" container)
echo -n "$containerIP <=> "
docker exec container ip addr show eth0 | grep inet | cut -d' ' -f6

docker exec container route
route

echo "ping from the checker container"
for target in nginx ${netPrefix}.${ipHost} ${netPrefix}.${ipShim} ${netPrefix}.${ipGateway} $theInternet
do
    echo -n " * $target> "
    docker exec container ping -c3 -q -w2 $target | egrep -o '[0-9]*% packet loss'
done

# echo "from host via '$netDev':"
# for target in ${netPrefix}.${ipGateway} $theInternet $containerIP
# do
#     echo -n " * $target> "
#     ping -c3 -q -w2 -I $netDev $target | egrep -o '[0-9]*% packet loss'
# done
# 
# echo "from host via '$shimDev':"
# for target in ${netPrefix}.${ipGateway} $theInternet $containerIP
# do
#     echo -n " * $target> "
#     ping -c3 -q -w2 -I $shimDev $target | egrep -o '[0-9]*% packet loss'
# done

echo "from host [any]"
for target in ${netPrefix}.${ipGateway} $theInternet $containerIP
do
    echo -n " * $target> "
    ping -c3 -q -w2 $target | egrep -o '[0-9]*% packet loss'
done

echo "cleanup"
echo -n " * delete checker "; docker rm -f container
echo -n " * delete container "; docker rm -f nginx
echo -n " * delete network "; docker network rm $macNet 
echo -n " * delete shimInterface '$shimDev'"; sudo ip link delete $shimDev; echo
echo -n " * turn off promisc on '$netDev'"; sudo ip link set $netDev promisc off; echo