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[Xen-devel] [PATCH][qemu-xen] Change tap device mac address to prevent c
| To: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] [PATCH][qemu-xen] Change tap device mac address to prevent change of bridge's mac |
| From: | Miroslav Rezanina <mrezanin@xxxxxxxxxx> |
| Date: | Tue, 21 Dec 2010 08:13:03 -0500 (EST) |
| Delivery-date: | Tue, 21 Dec 2010 05:13:46 -0800 |
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Qemu tap device is created with random mac address and then add to bridge. Due
to linux kernel handlig, bridge change its mac address to tap mac in case tap
mac is lower than bridge one. This can lead to short network breakage for dom0
and guests.
This patch set tap device mac adress to FE:FF:FF:FF:FF:FF to ensure tap device
mac is always higher then bridge one.
Signed-off-by: Miroslav Rezanina <mrezanin@xxxxxxxxxx>
Patch:
--
diff --git a/i386-dm/qemu-ifup-Linux b/i386-dm/qemu-ifup-Linux
index bcbee92..c706a10 100644
--- a/i386-dm/qemu-ifup-Linux
+++ b/i386-dm/qemu-ifup-Linux
@@ -33,5 +33,8 @@ then
fi
fi
+# We have to change mac address of tap device to not change bridge mac
+ip link set $1 addr fe:ff:ff:ff:ff:ff
+
ifconfig $1 0.0.0.0 up
brctl addif $bridge $1 || true
--
Miroslav Rezanina
Software Engineer - Virtualization Team - XEN kernel
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