[ovirt-users] R: R: PXE boot of a VM on vdsm don't read DHCP offer
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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