Qemu networking setup

          
------------        ----------
|           |      |  Guest  |
| Host  ----+------+-----    |
|      |    | Hub  |     |   |
|      |tap0|      |tap1 |   |
|      |-----+-----+-----|   |
| eth0      |      |         |
|   |       |      |         |
----+-------       ----------
 |
(Internet)

Host
* Add a hub
# vde_switch  -x -d -tap tap0 -tap tap1
* Assign ip to host's nic
# ifconfig tap0 192.168.1.1
* Setup ip forwarding
Modify /etc/sysctl.conf
net.ipv4.ip_forward=1
* Setup masquerading
# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
* Fire qemu
# vdeqemu -m 1024 -localtime /vm//jos_8.04_01/jos_8.04_01.img

Guest
# ifconfig eth0 192.168.1.2
# route add default gw 192.168.1.1
# vi /etc/resolv.com
# ping google.com