Bug 238393 – network unreachable with qemu/kvm

Bug 238393 - network unreachable with qemu/kvm

Summary:	network unreachable with qemu/kvm

Status:	CLOSED RAWHIDE

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	virt-manager (Show other bugs)
Sub Component:
Version:	rawhide
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Daniel Berrange
QA Contact:	Brian Brock
Docs Contact:

URL:
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Depends On:
Blocks:
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Reported:	2007-04-30 00:58 EDT by Jens Petersen
Modified:	2007-11-30 17:12 EST (History)
CC List:	1 user (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2007-05-01 20:13:10 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Jens Petersen 2007-04-30 00:58:51 EDT

Description of problem:
If I start a qemu guest OS in rawhide it seems the network connection
on eth0 is unreachable.  I guess the bridge is not working correctly.

How reproducible:
every time

Steps to Reproduce:
1. try to install FC6 via http as a guest OS
  
Actual results:
Can't connect to http mirror.

Expected results:
Network connection to work like under xenbr.

Additional info:
I configure the qemu guest network to be "Virtual network -> default"
since "Shared physical device" shows no devices.

Comment 1 Daniel Berrange 2007-05-01 11:40:54 EDT

Can you tell me what kernel version is being used in the guest OS ? The most
likely reason for the broken connectivity is a kernel bug todo with checksumming.

You can verify this theory by doing:

In the host:

  ethtool -K virbr0  tx off

And in the guest:

  ethtool -K eth0 tx off

With both those disabled, networking should work.  The real fix will be done in
the kernel-xen RPM.

Comment 2 Jens Petersen 2007-05-01 20:13:10 EDT

(BTW I am running qemu with kernel-2.6.21-1.3116.fc7.x86_64 and kvm.)

Yum upgrading to the latest rawhide today pulled in dnsmasq and networking
is working now. :)

Comment 3 Jens Petersen 2007-05-01 20:48:02 EDT

However I am still not able to do a network install of guests for qemu.

Comment 4 Jens Petersen 2007-05-01 23:11:04 EDT

BTW is kernel-xen required for networking with qemu?

(I ran "ethtool -K virbr0  tx off" on the host but
couldn't run "ethtool -K eth0 tx off" on a rhel5 qemu guest.)

> However I am still not able to do a network install of guests for qemu.

Actually after rebooting again everything *is* working now. <shrug/>

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