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Re: [Qemu-devel] TUN network

From: Thomas Munn
Subject: Re: [Qemu-devel] TUN network
Date: Tue, 27 Jul 2004 12:40:04 -0400

You might find the list a little non-comunicative.  You will need a
qemu-ifup script which you can call with the -n paramater.

You also need to compile the "tun/tap" device for your kernel or insert
the module if you already have it.  e.g. modprobe tun.

Additionally you will need to turn on ip-forwarding, by

echo 1>/proc/sys/net/ipv4/ip_forward 

Hope this helps.  Thomas Still haven't figured out how to iptables the
host, tho!

FYI the tun0 device doesn't exist until AFTER you start the program.  It
disappears when you quit qemu.

Here is my qemu-ifup script (you have to run qemu twice, but it
eventually works)
## Set your host os to the following
## IP -
## Mask -
## Gateway -
## DNS - whatver is in your resolv.conf

# Remember to have the following in sysctl.conf and do sysctl -p
# net.ipv4.ip_forward = 1

# Set these to the IP/mask you want to your qemu vm to have on the

# Setup an interface for the vm to use
ifconfig eth0:1 up $qemu_ip netmask $qemu_netmask

# Clear iptables
iptables -t nat -F PREROUTING
iptables -t nat -F POSTROUTING

# Setup NAT
iptables -t nat -A PREROUTING -d $qemu_ip \
        -j DNAT --to-destination
        iptables -t nat -A POSTROUTING -s \
                -j SNAT --to-source $qemu_ip
                # Bring up the TUN interface
                exec /sbin/ifconfig $1 running for 
the qemu virtual machine, has any one had any exprience with this? 
the instructions say to modprobe tun to get the tun module loaded and 
then to run the following command 
ifconfig tun0 netmask 
to get the interface configured. 
lsmod shows that there is a device module loaded and there is a device 
in the dev directory /dev/net/tun 
but I get the following error. 
SIOCSIFADDR: No such device 
tun0: unknown interface: No such device 
SIOCSIFNETMASK: No such device 
if any one can point me to the right Docs then Id appreciate it, Im sure

its something that Im not doing right 
thanks DarR!N 

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