Bug 632712

Summary:	PXE Boot Fails with virtio NIC
Product:	Red Hat Enterprise Linux 6	Reporter:	Gordan Bobic <gordan>
Component:	qemu-kvm	Assignee:	Glauber Costa <gcosta>
Status:	CLOSED NOTABUG	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	high
Version:	6.0	CC:	amcnabb, amit.shah, berrange, mkenneth, tburke, virt-maint
Target Milestone:	beta	Keywords:	Reopened
Target Release:	6.1
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-03-02 14:23:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	580954

Description Gordan Bobic 2010-09-10 19:32:18 UTC

Description of problem:
If the VM NIC is virtio based, PXE boot fails. e1000 works OK, though.

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.90.el6.x86_64

How reproducible:
Every time.

Steps to Reproduce:
1. Create an empty VM, set RHEL6 as the VM type
2. Try to PXE boot via a bridged interface
  
Actual results:
For virtion:
gPXE> dhcp net0
DHCP (net0 52:54:00:56:4e:1f)................ Connection timed out (0x4c106035)
Could not configure net0: Connection timed out (0x4c106035)

However, setting it to e1000:
gPXE> dhcp net0
DHCP (net0 52:54:00:56:4e:1f)................ ok
gPXE>


Expected results:
Should work for both virtio and emulated NICs.

Comment 2 Amit Shah 2010-10-15 10:20:57 UTC

Is this bug related to bug 632716?

Comment 3 Gordan Bobic 2010-10-15 10:34:08 UTC

I don't think they are related per se. This is about DHCP failing. https://bugzilla.redhat.com/show_bug.cgi?id=632716 is about the tftp boot failing. This is lower level than that.

Comment 4 Amit Shah 2010-10-15 10:45:04 UTC

(In reply to comment #3)
> I don't think they are related per se. This is about DHCP failing.
> https://bugzilla.redhat.com/show_bug.cgi?id=632716 is about the tftp boot
> failing. This is lower level than that.

Ah, I see now.  This is due to the bridge delay.  Glauber, Dan, any ideas how to resolve this?

Comment 5 Daniel Berrangé 2010-10-15 10:55:40 UTC

There's not enough information here really.

Please provide the full libvirt XML for the guest, and the corresponding /var/log/libvirt/qemu/$GUEST.log file

Also provide info on the host networking setup from

  ifconfig -a
  brctl show
  brctl showstp $BRIDGENAME
  sysctl -a | grep ip_forward
  iptables -L -n -v
  iptables -t nat -L -n -v

Finally what libvirt RPM version is present.

Comment 6 Andrew McNabb 2010-11-19 01:35:00 UTC

Is this a duplicate of bug #586324?

Comment 7 Gordan Bobic 2010-11-20 11:34:03 UTC

Yes, it looks like it is!
Setting DELAY=0 in the ifcfg-br0 config file solves the problem.

Comment 8 Bill Burns 2010-11-20 13:12:18 UTC

Closed as a dup per previous comments.

*** This bug has been marked as a duplicate of bug 586324 ***

Comment 9 Bill Burns 2010-11-20 13:19:17 UTC

Oops other bug is a Fedora bug. Will leave this RHEL bug assigned.

Comment 11 Glauber Costa 2011-03-02 14:26:01 UTC

*** Bug 632716 has been marked as a duplicate of this bug. ***