Linux network namespaces

README.md

Abbreviations

• mc - just prefix for every object in this example
• br - bridge
• rtr - router
• srv - server (is not different from client)
• cli - client (is not different from server)

Network namespaces and interfaces

• mc-rtr
  • mc-rtr-br
  • mc-rtr-srv
  • mc-rtr-cli1
  • mc-rtr-cli2
• mc-srv
  • mc-srv-rtr
• mc-cli1
  • mc-cli1-rtr
• mc-cli2
  • mc-cli2-rtr

cleanup

#!/bin/sh

set -e

ip netns delete mc-rtr
ip netns delete mc-srv
ip netns delete mc-cli1
ip netns delete mc-cli2

echo 'OK!'

prepare

#!/bin/sh

set -ex

ip netns add mc-rtr
ip netns add mc-srv
ip netns add mc-cli1
ip netns add mc-cli2

ip link add mc-rtr-srv  type veth peer name mc-srv-rtr
ip link add mc-rtr-cli1 type veth peer name mc-cli1-rtr
ip link add mc-rtr-cli2 type veth peer name mc-cli2-rtr

ip link set mc-rtr-srv  netns mc-rtr
ip link set mc-rtr-cli1 netns mc-rtr
ip link set mc-rtr-cli2 netns mc-rtr
ip link set mc-srv-rtr  netns mc-srv
ip link set mc-cli1-rtr netns mc-cli1
ip link set mc-cli2-rtr netns mc-cli2

ip netns exec mc-rtr brctl addbr mc-rtr-br
ip netns exec mc-rtr brctl addif mc-rtr-br mc-rtr-srv
ip netns exec mc-rtr brctl addif mc-rtr-br mc-rtr-cli1
ip netns exec mc-rtr brctl addif mc-rtr-br mc-rtr-cli2

ip netns exec mc-rtr  ip link set lo up
ip netns exec mc-srv  ip link set lo up
ip netns exec mc-cli1 ip link set lo up
ip netns exec mc-cli2 ip link set lo up

ip netns exec mc-rtr  ip addr add 10.0.0.1/24 brd + dev mc-rtr-br
ip netns exec mc-srv  ip addr add 10.0.0.2/24       dev mc-srv-rtr
ip netns exec mc-cli1 ip addr add 10.0.0.3/24       dev mc-cli1-rtr
ip netns exec mc-cli2 ip addr add 10.0.0.4/24       dev mc-cli2-rtr

ip netns exec mc-rtr  ip addr add fd00::1/64 dev mc-rtr-br
ip netns exec mc-srv  ip addr add fd00::2/64 dev mc-srv-rtr
ip netns exec mc-cli1 ip addr add fd00::3/64 dev mc-cli1-rtr
ip netns exec mc-cli2 ip addr add fd00::4/64 dev mc-cli2-rtr

ip netns exec mc-rtr  ip link set mc-rtr-br   up
ip netns exec mc-rtr  ip link set mc-rtr-srv  up
ip netns exec mc-rtr  ip link set mc-rtr-cli1 up
ip netns exec mc-rtr  ip link set mc-rtr-cli2 up
ip netns exec mc-srv  ip link set mc-srv-rtr  up
ip netns exec mc-cli1 ip link set mc-cli1-rtr up
ip netns exec mc-cli2 ip link set mc-cli2-rtr up

echo 'OK!'

test4

#!/bin/sh

set -e

sudo ip netns exec mc-rtr ping -c 3 10.0.0.1
sudo ip netns exec mc-rtr ping -c 3 10.0.0.2
sudo ip netns exec mc-rtr ping -c 3 10.0.0.3
sudo ip netns exec mc-rtr ping -c 3 10.0.0.4

sudo ip netns exec mc-srv ping -c 3 10.0.0.1
sudo ip netns exec mc-srv ping -c 3 10.0.0.2
sudo ip netns exec mc-srv ping -c 3 10.0.0.3
sudo ip netns exec mc-srv ping -c 3 10.0.0.4

sudo ip netns exec mc-cli1 ping -c 3 10.0.0.1
sudo ip netns exec mc-cli1 ping -c 3 10.0.0.2
sudo ip netns exec mc-cli1 ping -c 3 10.0.0.3
sudo ip netns exec mc-cli1 ping -c 3 10.0.0.4

sudo ip netns exec mc-cli2 ping -c 3 10.0.0.1
sudo ip netns exec mc-cli2 ping -c 3 10.0.0.2
sudo ip netns exec mc-cli2 ping -c 3 10.0.0.3
sudo ip netns exec mc-cli2 ping -c 3 10.0.0.4

echo 'OK!'

test6

#!/bin/sh

set -ex

sudo ip netns exec mc-rtr ping6 -c 3 fd00::1
sudo ip netns exec mc-rtr ping6 -c 3 fd00::2
sudo ip netns exec mc-rtr ping6 -c 3 fd00::3
sudo ip netns exec mc-rtr ping6 -c 3 fd00::4

sudo ip netns exec mc-srv ping6 -c 3 fd00::1
sudo ip netns exec mc-srv ping6 -c 3 fd00::2
sudo ip netns exec mc-srv ping6 -c 3 fd00::3
sudo ip netns exec mc-srv ping6 -c 3 fd00::4

sudo ip netns exec mc-cli1 ping6 -c 3 fd00::1
sudo ip netns exec mc-cli1 ping6 -c 3 fd00::2
sudo ip netns exec mc-cli1 ping6 -c 3 fd00::3
sudo ip netns exec mc-cli1 ping6 -c 3 fd00::4

sudo ip netns exec mc-cli2 ping6 -c 3 fd00::1
sudo ip netns exec mc-cli2 ping6 -c 3 fd00::2
sudo ip netns exec mc-cli2 ping6 -c 3 fd00::3
sudo ip netns exec mc-cli2 ping6 -c 3 fd00::4

echo 'OK!'