Re: [Qemu-devel] Morphix booting in 1024x768 resolution and Win32 questions

[Luca Ferroni <luca.ferroni@studio.unibo.it>]

Il Tue, 16 Mar 2004 18:38:41 +0200,  Markus Niemistö <markus.niemisto@iki.fi> ha scritto:

> 1) Download and extract linux-test package from QEMU homepage
> 
> 2) Configure your kernel to support tun and tap (see bochs manual)
> 

When I insert module tun in my kernel 2.6.4, I have to rebuild the link in devfs to make qemu working
this is the original link 		/dev/net/tun -> misc/net/tun
this is the modified link		/dev/net/tun -> /dev/misc/net/tun

> 3) Create a network script; put the following lines to the
> /etc/qemu-ifup file:
> 
> #!/bin/sh
> /sbin/ifconfig $1 172.20.0.1
> 
> and make the file executable: chmod 755 /etc/qemu-ifup
> 

The problem of root execution is the script /etc/qemu-ifup which calls ifconfig
It is not enough to set permissions 755 to this script
You can use sudo, 

#!/bin/sh
sudo /sbin/ifconfig $1 172.20.0.1

and put your user in /etc/sudoers file

user	ALL=(ALL) 	NOPASSWD: ALL

Obviously you need sudo package installed in your system


> 4) Start X server with TCP listening turned on: startx -listen_tcp
> 
> 5) Allow X connections from 172.20.0.2 (the quest). Run:
> 
> xhost +172.20.0.2
> 
> 6) Run QEMU with linux-test distribution:
> 
> qemu -hda /tmp/linux-test/linux.img
> 
> 7) Setup DISPLAY variable in quest. Type in linux-test prompt:
> 
> export DISPLAY=172.20.0.1:0
> 
> 8) Run xterm from the quest:
> 
> /usr/X11R6/bin/xterm
> 
> You can also ping 172.20.0.1 or run xlogo or whatever
> 
> And voilá! You have an xterm running in QEMU but it is displayed on your
> host's X server. Network works! I have to run QEMU as root, so if this
> doesn't work, try running QEMU as root.
> 
> So what really happens is that you see the QEMU quest as 172.20.0.2 and
> it sees your computer as 172.20.0.1.
> 
> The following is untested but AFAIK it should work. In order to access
> the Internet from the QEMU quest, set the gateway and nameserver of the
> host to the gateway and nameserver you normally use on your computer.
> You may have to do some additional route configuration, but I am not
> sure (and cannot help you with that becouse I don't know that much
> about Linux).
> 

In your host OS you have to build iptables with NAT support in your kernel.
then you have to install iptables package and do the following:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

And so, you can surf the web and make net update to your guest ... great!

I hope this help
bye


-- 
----------------------------------------
Non ci toglieranno mai....la LIBERTA'!!!
Luca Ferroni
www.cs.unibo.it/~fferroni/
----------------------------------------