Kvm usermode networking

[T o n g <mlist4suntong@yahoo.com>]

Hi,

How do I use the '-net user' kvm command-line option?

According to
https://help.ubuntu.com/community/KVM/Networking

,-----
| By default, if you enable the usermode networking using the '-net
| user' command-line option, the guest OS will get an IP address in
| the 10.0.2.0/24 address space and the host OS will be reachable
| at 10.0.2.2.
`-----

However, whenever I use the '-net user' option, there will be no eth0 
device. I.e.,

 kvm -boot d -cdrom linux-live.iso

This I'll get an eth0 device, and an IP for it.

 kvm -net user -boot d -cdrom linux-live.iso

This I won't get the eth0 device.

As for linux-live.iso, I've tried two different ones, and the symptom is 
the same. 

My kvm is just the vanilla one:

$ apt-cache policy qemu-kvm
qemu-kvm:
  Installed: 0.12.5+dfsg-3
  Candidate: 0.12.5+dfsg-3
  Version table:
 *** 0.12.5+dfsg-3 0
        360 http://cdn.debian.net testing/main Packages
         50 http://cdn.debian.net unstable/main Packages
        100 /var/lib/dpkg/status

Please help. 

Thanks

-- 
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