This is a simple example of namespace networking.
- Create 4 different namespaces and assign an ip address to each side of the veth pair
sudo ip netns add ns1
sudo ip netns add ns2
sudo ip netns add ns3
sudo ip netns add ns4
sudo ip link add veth1 type veth peer name veth11
sudo ip link add veth2 type veth peer name veth12
sudo ip link add veth3 type veth peer name veth13
sudo ip link add veth4 type veth peer name veth14
sudo ip link set veth11 netns ns1
sudo ip link set veth12 netns ns2
sudo ip link set veth13 netns ns3
sudo ip link set veth14 netns ns4
sudo ip netns exec ns1 ifconfig lo up
sudo ip netns exec ns2 ifconfig lo up
sudo ip netns exec ns3 ifconfig lo up
sudo ip netns exec ns4 ifconfig lo up
sudo ifconfig veth1 10.1.11.1/24 up
sudo ifconfig veth2 10.1.12.1/24 up
sudo ifconfig veth3 10.1.13.1/24 up
sudo ifconfig veth4 10.1.14.1/24 up
sudo ip netns exec ns1 ifconfig veth11 10.1.11.2/24 up
sudo ip netns exec ns2 ifconfig veth12 10.1.12.2/24 up
sudo ip netns exec ns3 ifconfig veth13 10.1.13.2/24 up
sudo ip netns exec ns4 ifconfig veth14 10.1.14.2/24 up
sudo ip netns exec ns1 route add default gw 10.1.11.1 veth11
sudo ip netns exec ns2 route add default gw 10.1.12.1 veth12
sudo ip netns exec ns3 route add default gw 10.1.13.1 veth13
sudo ip netns exec ns4 route add default gw 10.1.14.1 veth14
Now from ns1
ping ns2
, ns3
, and ns4
and verify reachability.
ip netns exec ns1 ping -c2 10.1.12.2
ip netns exec ns1 ping -c2 10.1.13.2
ip netns exec ns1 ping -c2 10.1.14.2
To remove the newly created namespaces.
sudo ip netns del ns1
sudo ip netns del ns2
sudo ip netns del ns3
sudo ip netns del ns4