I have 3 VM (qemu with tap interface), 2 on vlan 10 and 1 on vlan 66 on the same lab1 OpenVSwitch. The first VM is connected via a tap interface on port lab1vm1. The second has 2 network interfaces connected on port lab1dhcp and lab1dhcpmaster and the third VM on port dhcpmaster.
------------- ----------------------- --------------
| VM 1 | | VM2 | | VM3 |
|10.10.10.3 | |10.8.6.1 10.10.10.13| | 10.10.10.2 |
------------- ----------------------- --------------
| | | |
| | | |
------------------------------------------------------------------
|lab1vm1 lab1dhcp lab1dhcpadm dhcpmaster OVS lab1|
|tag 10 tag 10 tag 66 tag 66 |
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The OpenVSwitch is configured as follow :
Bridge "lab1"
Port "lab1vm1"
tag: 10
Interface "lab1vm1"
Port "lab1"
tag: 10
Interface "lab1"
type: internal
Port "lab1dhcp"
tag: 10
Interface "lab1dhcp"
Port "lab1dhcpadm"
tag: 66
Interface "lab1dhcpadm"
Port dhcpmaster
tag: 66
Interface dhcpmaster
ovs_version: "2.9.2"
The problem: VM1 can ping VM3!
- If I power off VM2 or shutdown lab1dhcp or lab1dhcpadm interface, the ping doesn't work.
- If I shutdown the two network interfaces of VM2, ping works !
Why VM2 relay ICMP packet from VM1 to VM3 ? The broadcast send
by VM1 reach also VM3 ! for example, if I ask an address from
dhcp client on VM1, VM3 receive the dhcp discover.