I would like to follow up and bring Proxy arp to your attention.
With proxy arp you can route traffic to your LAN via your wireless card (if you wish to access a samba or nfs share for example).
This is done with a few simple commands:
tunctl
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/conf/wlan0/proxy_arp
echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp
ip link set tap0 up
route add -host 192.168.0.20 dev tap0
You can now use the tap0 on the guest (from the command line). In fedora you need to allow the traffic as the default settings in iptables will block the traffic)
The tap0 does not appear as an option in virt-manager, so you have to start kvm from the command line.
In the guest configure a static IP with the route ip as a gateway.
I hope this information is helpful and perhaps you could consider adding the option to virt manager.
I posted a blog on how I did this on Fedora 11 here :
http://blog.bodhizazen.net/linux/bridge-wireless-cards/
(Yes I know it is not technically a bridge, but it accomplishes what I need / want, ie the guest behaves as if it is on th eLAN and I can manage internet access via my router rather then the host and I can use samba and nfs with the guest and a wireless network card on the host).
HTH, thanks
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