Macvlan based interface pings from host but not from namespace
- by jtlebi
My setup:
Private network vboxnet1 10.0.7.0/24
1 Host, ubuntu desktop
1 VM, ubuntu server (VirtualBox)
Adressing layout:
HOST: 10.0.7.1
VM: 10.0.7.101
VM MAC NAMESPACE: 10.0.7.102
On the VM, I ran the following commands:
ip netns add mac # create a new nmespace
ip link add link eth0 mac0 type macvlan # create a new macvlan interface
ip link set mac0 netns mac
On the mac namespace, inside the VM:
ip link set lo up
ip link set mac up
ip addr add 10.0.7.102/24 dev mac0
So that we basically end up with: (Like Inception ?)
+------------------------+
| Host: 10.0.7.1 |
| |
| +--------------------+ |
| | VM: 10.0.7.101 | |
| | | |
| | +----------------+ | |
| | | NS: 10.0.7.102 | | |
| | | | | |
| | +----------------+ | |
| +--------------------+ |
+------------------------+
What works:
Ping between Host and VM
Ping between NS and NS
dhclient from NS
What does not work:
ping between NS and VM
ping between NS and Host
Where I started to go nuts:
tcpdump on host (the real machine) actually shows ARP request AND replies
tcpdump on NS shows ARP requests sent to the host
tcpdump on VM makes the whole mess work (!) -- ping starts to get answers when tcpdump is started on the VM ?!?
So, I bet you were eager for it, my question is: how to I make it work ? I suspect something's wrong with ARP on the macvlan inside the NS but can't figure out what exactly...
Btw, I did the same expérimentations with the mac0 interface directly on the VM (no namespace) and it worked flawlessly.
