[ovirt-users] R: R: PXE boot of a VM on vdsm don't read DHCP offer
NUNIN Roberto
Roberto.Nunin at comifar.it
Fri May 8 09:11:25 EDT 2015
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.
>
> 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.
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
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