Bonjour J'ai un problème d'isolation entre des VM connectés à un OpenVSwitch et utilisant des VLAN. Les vlan ne jouent pas leur rôle de cloisement. Je copie ci-dessous le post stackoverflow que j'ai effectué, resté sans réponse à ce jour. 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 | ------------------------------------------------------------------ | The OpenVSwitch is configured as follow : |Bridge"lab1"Port"lab1vm1"tag:10Interface"lab1vm1"Port"lab1"tag:10Interface"lab1"type:internal Port"lab1dhcp"tag:10Interface"lab1dhcp"Port"lab1dhcpadm"tag:66Interface"lab1dhcpadm"Portdhcpmaster tag:66Interfacedhcpmaster 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. Merci pour votre aide. Florent