QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward
by bren_doyle1@yahoo.com from LinuxQuestions.org on (#4V0YX)
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):
Code:vm3-62 vm2-62
---------- ------------
eth1: 172.15.62.105 eth1: 172.15.62.205
(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 172.15.62.105, 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 172.15.62.105 (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? .
Thanks
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):
Code:vm3-62 vm2-62
---------- ------------
eth1: 172.15.62.105 eth1: 172.15.62.205
(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 172.15.62.105, 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 172.15.62.105 (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? .
Thanks