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Re: [Qemu-devel] eth0 problems

From: Joe Menola
Subject: Re: [Qemu-devel] eth0 problems
Date: Sat, 28 Aug 2004 21:53:02 -0500
User-agent: KMail/1.7

On Sat August 28 2004 7:55 pm, Lonnie Cumberland wrote:
> I just looked at  the kernel sources for my 2.6.3-7mdk kernel and
> TUN/TAP has already been compiled in as a module.
> Although there is no /dev/net/tun0 listed or /dev/tun0 as well

/dev/net/tun0 wont exist until module "tun" is loaded.

If you wish to setup a tun device, I've created a small and raw howto for my 
own use on what works for me. Should give you a decent start...

First off, kernel needs tun networking support compiled in and module loaded. 

"eth0" =host device connected to lan 
"/etc/rc.d/init.d" = path to init scripts
adjust as needed

                Setup Masquerade 

Run in terminal as root:
        # iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE 
        #/etc/rc.d/init.d/iptables save

                Sanity check
        #/etc/rc.d/init.d/iptables start
        #/etc/rc.d/init.d/iptables status

Rule "Chain POSTROUTING (policy ACCEPT)" 
 should contain:
        "MASQUERADE  all  --  anywhere             anywhere"

                Create Ifup scripts

1- Create file: /etc/qemu-ifup 

sudo /sbin/ifconfig $1 <ip address>
sudo /etc/qemu-iptables

2- #chmod 777 /etc/qemu-ifup

3- Create file /etc/qemu-iptables

/etc/rc.d/init.d/iptables stop
echo "1" >&/proc/sys/net/ipv4/ip_forward
/etc/rc.d/init.d/iptables start
#/usr/sbin/dhcpd -q tun0

4- #chmod 777 /etc/qemu-iptables

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