On Fri, May 08, 2015 at 03:11:25PM +0200, NUNIN Roberto wrote:
Hi Dan Thanks for answering
Which kernel does the el7 host run? I think that Ido has seen a case where `brctl showmacs` was not populated with the VM mac, despite a packet coming out of it.
Kernel is: 3.10.0-123.20.1.el7.x86_64, package is vdsm only. Brctl isn't available within vdsm only package.
Could you try upgrading to a more up-to-date http://mirror.centos.org/centos-7/7.1.1503/updates/x86_64/Packages/kernel-3.... ? bridge-utils is a vdsm dependency. It must exist on your host. Please see if the mac of the vNIC shows up on `brctl showmacs` as it should.
Can you tcpdump and check whether the bridge propogated the DHCP offer to the tap device of the said VM? Does the packet generated by `ether-wake MAC-of-VM` reach the tap device?
Yes: host "see" the broadcast : 0.000000 0.0.0.0 255.255.255.255 DHCP 346 DHCP Discover - Transaction ID 0x69267b67 It came from the right MAC: Source: Qumranet_15:81:03 (00:1a:4a:15:81:03) And it is tagged correctly: 802.1Q Virtual LAN, PRI: 0, CFI: 0, ID: 3500
This is the offer, on the bond interface: 1.012355 10.155.124.2 10.155.124.246 DHCP 346 DHCP Offer - Transaction ID 0x69267b67 Layer 2 info: Ethernet II, Src: Cisco_56:83:c3 (84:78:ac:56:83:c3), Dst: Qumranet_15:81:03 (00:1a:4a:15:81:03) Tagging on the bond: 802.1Q Virtual LAN, PRI: 0, CFI: 0, ID: 3500
The tag is correctly removed when DHCP offer is forwarded over the bond.3500. Here's the offer content, seems everything right:
Client IP address: 0.0.0.0 (0.0.0.0) Your (client) IP address: 10.155.124.246 (10.155.124.246) Next server IP address: 10.155.124.223 (10.155.124.223) Relay agent IP address: 10.155.124.2 (10.155.124.2) Client MAC address: Qumranet_15:81:03 (00:1a:4a:15:81:03) Client hardware address padding: 00000000000000000000 Server host name: 10.155.124.223 Boot file name: pxelinux.0 Magic cookie: DHCP
Nothing of this offer appear on the VM side.
But does it show on the host's bridge? on the tap device?
ether-wake -i bond0.3500 00:1a:4a:15:81:03 (started from the host) reach the VM eth0 interface: 2.002028 HewlettP_4a:47:b0 Qumranet_15:81:03 WOL 116 MagicPacket for Qumranet_15:81:03 (00:1a:4a:15:81:03)
Really strange behavior.
Roberto