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Bug 617243

Summary:	libvirt should not use the MAC address assigned to tap devices/vnet interfaces by the TAP/TUN driver.
Product:	Red Hat Enterprise Linux 5	Reporter:	RHEL Program Management <pm-rhel>
Component:	libvirt	Assignee:	Jiri Denemark <jdenemar>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	urgent
Version:	5.5.z	CC:	acathrow, akunysz, apevec, a.rogge, berrange, bhughes, dallan, dyasny, eblake, fleitner, james.brown, jentrena, jialiu, jplans, llim, nachandr, olaf, pm-eus, tao, veillard, virt-maint, xen-maint
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	libvirt-0.6.3-33.el5_5.2	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-08-10 17:02:48 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:	571991, 652605
Bug Blocks:

Description RHEL Program Management 2010-07-22 15:08:05 UTC

This bug has been copied from bug #571991 and has been proposed
to be backported to 5.5 z-stream (EUS).

Comment 3 Jiri Denemark 2010-07-26 14:21:41 UTC

Fix built into libvirt-0.6.3-33.el5_5.2

Comment 5 Johnny Liu 2010-08-02 10:11:52 UTC

Verify this bug with libvirt-0.6.3-33.el5_5.3 on RHEL5u5-Server X86_64 KVM, and PASSED.

Here is my steps:
1. Define a guest with the following mac address.
<mac address='54:52:00:12:ce:b8'/>
2. Start/Destroy guest for several times, bridge mac address is not changed, so host is always keep reachable.

Before start guest:

# brctl show; ifconfig br0;ifconfig eth0
bridge name	bridge id		STP enabled	interfaces
br0		8000.6cf049270c06	no		eth0
virbr0		8000.000000000000	yes		
br0       Link encap:Ethernet  HWaddr 6C:F0:49:27:0C:06  
          inet addr:10.66.92.198  Bcast:10.66.93.255  Mask:255.255.254.0
          inet6 addr: 3ffe:501:ffff:100:6ef0:49ff:fe27:c06/64 Scope:Global
          inet6 addr: fe80::6ef0:49ff:fe27:c06/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6433 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1952 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:4789942 (4.5 MiB)  TX bytes:239926 (234.3 KiB)

eth0      Link encap:Ethernet  HWaddr 6C:F0:49:27:0C:06  
          inet6 addr: fe80::6ef0:49ff:fe27:c06/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4548553 errors:0 dropped:1357 overruns:0 frame:0
          TX packets:1339934 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:6763681923 (6.2 GiB)  TX bytes:92213194 (87.9 MiB)
          Memory:fc300000-fc320000

Start guest:

# virsh start test1;brctl show; ifconfig br0;ifconfig vnet0
Domain test1 started

bridge name	bridge id		STP enabled	interfaces
br0		8000.6cf049270c06	no		vnet0
							eth0
virbr0		8000.000000000000	yes		
br0       Link encap:Ethernet  HWaddr 6C:F0:49:27:0C:06  
          inet addr:10.66.92.198  Bcast:10.66.93.255  Mask:255.255.254.0
          inet6 addr: 3ffe:501:ffff:100:6ef0:49ff:fe27:c06/64 Scope:Global
          inet6 addr: fe80::6ef0:49ff:fe27:c06/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6578 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1981 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:4805423 (4.5 MiB)  TX bytes:244592 (238.8 KiB)

vnet0     Link encap:Ethernet  HWaddr FE:52:00:12:CE:B8  
          inet6 addr: fe80::fc52:ff:fe12:ceb8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:0 (0.0 b)  TX bytes:1964 (1.9 KiB)

Now libvirt should assign MAC address in the upper range (starting with FE:xx) to tap devices to prevent the MAC address of the bridge from changing every time a VM is created or destroyed.

So this bug is fixed.

Comment 6 errata-xmlrpc 2010-08-10 17:02:48 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2010-0615.html