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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)
-----------------------------------
#!/bin/bash
## Set your host os to the following
## IP - 192.168.1.1
## Mask - 255.255.255.0
## Gateway - 192.168.1.254
## 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
network
qemu_ip="1.1.1.1"
qemu_netmask="255.255.255.0"
# 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 192.168.1.1
iptables -t nat -A POSTROUTING -s 192.168.1.1 \
-j SNAT --to-source $qemu_ip
# Bring up the TUN interface
exec /sbin/ifconfig $1 192.168.1.254 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 192.168.0.3 netmask 255.255.255.0
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
- Re: [Qemu-devel] TUN network,
Thomas Munn <=