Bug 497706

Summary: suddenly there is no network on kvm guests
Product: [Fedora] Fedora Reporter: Matěj Cepl <mcepl>
Component: libvirtAssignee: Daniel Veillard <veillard>
Status: CLOSED INSUFFICIENT_DATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: rawhideCC: berrange, clalance, crobinso, itamar, markmc, rjones, veillard, virt-maint
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-05-05 08:21:20 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Attachments:
Description Flags
/var/log/messages none

Description Matěj Cepl 2009-04-26 07:54:17 EDT
Created attachment 341347 [details]
/var/log/messages

Description of problem:
Without changing anything in configuration all my guests lost network access. DHCP client fails on both Windows 7 and RHEL 5, with the same configuration which worked before.

Version-Release number of selected component (if applicable):
qemu-system-x86-0.10-12.fc11.x86_64
kernel-2.6.29.1-102.fc11.x86_64
qemu-img-0.10-12.fc11.x86_64
libvirt-0.6.2-2.fc11.x86_64
qemu-common-0.10-12.fc11.x86_64

How reproducible:
100%

Steps to Reproduce:
1.start kvm guest
2.
3.
  
Actual results:
startup of network on guest fails

Expected results:
should just work

Additional info:
Comment 1 Richard W.M. Jones 2009-04-26 08:25:17 EDT
I noticed the other day that guests which are configured in
qemu/kvm with
  -net nic,...
(no explicit model), no longer get the default model which was
rtl8139.  I wasn't sure if there is now no default model at all, or
if the default model changed to something else.  This may be
related anyhow.
Comment 2 Mark McLoughlin 2009-05-04 10:41:19 EDT
(In reply to comment #0)
> Created an attachment (id=341347) [details]
> /var/log/messages
> 
> Description of problem:
> Without changing anything in configuration all my guests lost network access.
> DHCP client fails on both Windows 7 and RHEL 5, with the same configuration
> which worked before.

If this is still happening take a look at:

  https://fedoraproject.org/wiki/Reporting_virtualization_bugs#Networking

and provide the info requested there

It could be that you changed your firewall config and a "service libvirtd reload" would fix it

(In reply to comment #1)
> I noticed the other day that guests which are configured in
> qemu/kvm with
>   -net nic,...
> (no explicit model), no longer get the default model which was
> rtl8139.  I wasn't sure if there is now no default model at all, or
> if the default model changed to something else.  This may be
> related anyhow.  

That shouldn't be the case; please file a new bug if you can reproduce this. I just tried with latest F-11 and rtl8139 does seem to be used as the default.
Comment 3 Matěj Cepl 2009-05-05 08:21:20 EDT
(In reply to comment #2)
> If this is still happening take a look at:
> 
>   https://fedoraproject.org/wiki/Reporting_virtualization_bugs#Networking
> 
> and provide the info requested there
> 
> It could be that you changed your firewall config and a "service libvirtd
> reload" would fix it

Not sure how to reproduce it now, and it seems to be working.