Bugs item #1896213, was opened at 2008-02-18 17:42
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Technologov (technologov)
Assigned to: Nobody/Anonymous (nobody)
Summary: VM locks up with several NICs, without VLANs

Initial Comment:
I have tried to setup F8 Router, but 3 VirtIO, 3 TAP and 3 bridges.

But I have not specified VLANs.

The Linux guest locks up as soon as as it send at least few packets.

Tried on KVM-60+, pink-intel, F7/x64 on Intel.

The correct command: (with VLANs)

/usr/local/bin/qemu-system-x86_64 -hda /isos/disks-vm/alexeye/Fedora8-64.vmdk 
-m 512 -net nic,vlan=0,macaddr=52:54:00:12:34:11,model=virtio -net 
tap,vlan=0,ifname=tap11,script=no -net 
nic,vlan=1,macaddr=52:54:00:12:34:12,model=virtio -net 
tap,vlan=1,ifname=tap12,script=no -net 
nic,vlan=2,macaddr=52:54:00:12:34:13,model=virtio -net tap,vlan=2,ifname=tap13 
-name F8-Main

The command, that locks up guest: (without VLANs)

/usr/local/bin/qemu-system-x86_64 -hda /isos/disks-vm/alexeye/Fedora8-64.vmdk 
-m 512 -net nic,macaddr=52:54:00:12:34:11,model=virtio -net 
tap,ifname=tap11,script=no -net nic,macaddr=52:54:00:12:34:12,model=virtio -net 
tap,ifname=tap12,script=no -net nic,macaddr=52:54:00:12:34:13,model=virtio -net 
tap,ifname=tap13 -name F8-Main

Better behavior would be to make a "WARNING" so users will know that they must 
use vlans, or best would be to fix this bug.

Steps to reproduce:
Use the command w/o VLANs, and start pinging...

If you configured bridges correctly, then guest will halt. If you configured 
bridges incorrectly, the ping will fail.
In any case it won't succeed. (ping from guest to host) 

-Alexey "Technologov", 18.02.2008.

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