User-mode Linux kernel port

On Mon, Sep 10, 2007 at 02:53:44PM -0400, siddhu srivatsan wrote:
> Hi,
> I downloaded the Kernel and Filesystem and got UML functioning. However, I
> was wondering if we can connect UML to host eth1?
> 
> If so is it just a replacement of eth0 with eth1 in the commands specified
> in the networking session or some different set of instructions need to be
> followed.

I think what you want is to create a tap device, give it to UML as its
eth0, and bridge it with the host's eth1.

The documentation I've written generally uses routing rather than
bridging - there are UML bridging HOWTOs around, so follow one of
them.

				Jeff

-- 
Work email - jdike at linux dot intel dot com

I tried to do it but still my uml is not connecting to the outside world. I
did the following steps
First in the host I did the following,
ifconfig eth1 0.0.0.0 promisc up
<http://10.0.1.255>brctl addbr uml-bridge
brctl setfd uml-bridge 0
brctl sethello uml-bridge
brctl stp uml-bridge off
ifconfig uml-bridge 10.227.89.13 netmask 255.255.255.0 up
tunctl -t tap0
ifconfig tap0 0.0.0.0 promisc up
brctl addif uml-bridge tap0

Then I got into the directory where I had the uml and gave the following
option with uml boot command
eth0=tuntap,tap0

Then in uml I gave eth0 its ip address using the command
ifconfig eth0 192.168.0.201 netmask 255.255.255.0

But when I tried to add the default gateway as 10.227.89.13 by using the
route add command, I get an error which just tells me that there is no such
device. I think I am missing something. Can someone let me know what is it
that I am missing.

Thanks
After this I started

On 9/10/07, Jeff Dike <jdike@...> wrote:
>
> On Mon, Sep 10, 2007 at 02:53:44PM -0400, siddhu srivatsan wrote:
> > Hi,
> > I downloaded the Kernel and Filesystem and got UML functioning. However,
> I
> > was wondering if we can connect UML to host eth1?
> >
> > If so is it just a replacement of eth0 with eth1 in the commands
> specified
> > in the networking session or some different set of instructions need to
> be
> > followed.
>
> I think what you want is to create a tap device, give it to UML as its
> eth0, and bridge it with the host's eth1.
>
> The documentation I've written generally uses routing rather than
> bridging - there are UML bridging HOWTOs around, so follow one of
> them.
>
>                                 Jeff
>
> --
> Work email - jdike at linux dot intel dot com
>

Hi,

siddhu srivatsan wrote:
> ifconfig uml-bridge 10.227.89.13 netmask 255.255.255.0
...
> ifconfig eth0 192.168.0.201 netmask 255.255.255.0
>
> But when I tried to add the default gateway as 10.227.89.13
> by using the route add command, I get an error
> which just tells me that there is no such device. I think I am missing
> something. Can someone let me know what is it that I am missing.

your default gateway must be reachable over one of your interfaces. You
have configured the bridge and your uml-client to be in different
subnets and your uml-client can't figure out the route to the gateway
you want to set.

Try one of these:

ifconfig uml-bridge 192.168.0.200 netmask 255.255.255.0 up
ifconfig eth0 192.168.0.201 netmask 255.255.255.0

ifconfig uml-bridge 10.227.89.13 netmask 255.255.255.0 up
ifconfig eth0 10.227.89.14 netmask 255.255.255.0

Make sure, that the network part of the ip-adress, in your case the
first 3 numbers match. Now you should be able to set the uml-bridge as
the gateway, because the route command can determine the interface over
which the gateway can be reached.

Jan