Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration actually work?
I created the vtap's using KVM Manager by adding a NIC, selecting Network source "macvtap", Source mode VEPA, Device model: virtio.
The configuration looks like this (mac address):
vm3-62 vm2-62 ---------- ------------ eth1: 188.8.131.52 eth1: 184.108.40.206 (52:54:00:08:9d:8b) (52::54:00:8a:b1:0f) + + | | \ / \ host / macvtap1 macvtap0 (52:54:00:08:9d:8b) (52:54:00:8a:b1:0f) \ / \ / \ / bond1.62 (98:03:9b:2d:91:a2) | bond1 | NIC port 1 and 2 (active/passive config)
Not sure if the above will format ok, If the above diagram did not format here is a jpeg
The host NIC is connected to a cisco nexus 9000, which I have configured for Reflective Relay 802.1Qbg.
On vm2-62 when I try ping 220.127.116.11, I get Destination Host Unreachable.
When I use tcpdump on the host, I can see the ARP request from vm2-62 looking for the mac for 18.104.22.168 (vm3-62). I can see the request on macvtap0, and on bond1.62 and on bond1, but NOT on macvtap1.
If I manually add ARP entries on vm3-62 & vm2-62, the ping works fine so I think the reflective relay on the switch is configured ok.
It just seems that either the switch is not bouncing back the ARP request or I need to do something in Linux to enable bond1.62 to forward the ARP request to macvtap1.
Any thoughts? .
FYI in case someone does stuble accross this that might have an insight, I want to add that I have also tried the suggestions from this post:
"ip link set dev macvtap0 allmulticast on" manually and also in the /etc/libvirt/hook/qemu, and added "interface type='direct' trustGuestRxFilters='yes'" to the vn file with virsh edit.