configuring bridge with wlan0 on libvirt (KVM) (RHEL6)

[Sam Varshavchik]

Kernel Guardian writes:

> Put into ifcfg-wlan0 :
>
> # bridged interface for wlan0
> BRIDGE=br1
>
> ifcfg-br1 :
> DEVICE=br1
> TYPE=Bridge
> ONBOOT=yes
> ...
>
> the rest of config is standard.
>
> after restart network service or whole system, you can use br1 as
> interface in KVM guest

What confidence level exists that all wireless cards support bridging (or  
that 802.11whatever supports a single client flinging multiple MACs at the  
access point, in the first place), and that all wireless adapters are  
willing to assign multiple DHCP leases to a single client, that suddenly  
starts babbling multiple MAC addresses, all of a sudden? That's what I'm  
wondering.

The way I reckon, with this kind of a setup NetworkManager will still try to  
obtain an IP address from the access point, when it logs in. But then, when  
the guest VM comes up, its stack will demand an IP address of its own, and  
that demand will also go to the access point.

But even if this works, the way I see it that this effectively prevents  
Networking from coming up on the guest unless wireless is up – because it  
now relies on the access point to give it one.

Has anyone tried this, and can actually claim that this works, and is not  
mere speculation. But even if it does, not being able to talk to the guest,  
unless wireless is up, seems rather inconvenient. I say the best way is  
just to enable NATing on the virtual bridge.

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