[Qemu-devel] Using QEMU as a terminal server?

[Qemu-devel] Using QEMU as a terminal server?

[Alexandre Leclerc]

Hi all,

I was thinking to something weird, but I don't know if it is totally
doable. So I ask your expertise. (Being under Linux to use W2K
images.)

- ssh login.
- then the login script launch a qemu session without the X session
(running without visual).
- there would be UltraVNC server inside the OS
- find a way to catch the nat ip address of this new qemu session
- trhu the ssh tunel, connect UltraVNC viewer to server.

Here we go I have a nive 'Terminal Server' connection.

Ok, if the ssh thing is not working, or simply, let us remove this
aspect; would such a thing be possible?

Having something like that would be amasing because then doing
windows-like terminal server on linux becomes possible. You map the
sessions in read-only to a master image file and there you go.

Best regards.

-- 
Alexandre Leclerc

Re: [Qemu-devel] Using QEMU as a terminal server?

[Michael McConnell]

Alexandre Leclerc wrote:
> Hi all,
> 
> I was thinking to something weird, but I don't know if it is totally
> doable. So I ask your expertise. (Being under Linux to use W2K
> images.)
> 
> - ssh login.
> - then the login script launch a qemu session without the X session
> (running without visual).
> - there would be UltraVNC server inside the OS
> - find a way to catch the nat ip address of this new qemu session
> - trhu the ssh tunel, connect UltraVNC viewer to server.
> 
> Here we go I have a nive 'Terminal Server' connection.
> 
> Ok, if the ssh thing is not working, or simply, let us remove this
> aspect; would such a thing be possible?
> 
> Having something like that would be amasing because then doing
> windows-like terminal server on linux becomes possible. You map the
> sessions in read-only to a master image file and there you go.

I do something very similar.

My localnet uses IPs in 192.168.a.0/24, and my QEMU sessions operate on 
separate 192.168.b.x/30 subnets, and for my Win2000 QEMU session I have 
ipchains NATing outbound connections and transparently forwarding a 
192.168.a.y address that is aliased on the host's eth0 (the host handles 
192.168.a.z as normal) to the 192.168.b.x/30 address used within QEMU. I 
then just open a VNC connection to 192.168.a.y port 5900, and it all 
works fine.

This forwarding means my net-facing box which handles inbound SSH from 
the internet can "see" the QEMU virtual machine without requiring a 
second level of port-forwarding.

My ssh looks something like this, from the outside world:

ssh -L5944:192.168.96.y:5900 -C username@hostname

The -C compresses, and despite VNC doing a lot of compression on its 
own, this does help, especially on low-bandwidth connections (e.g. 
dial-up, GPRS)

If you want to use user-mode networking instead of the tunnelling 
device, use the "-redir tcp:5900::5900" option for QEMU, then the host's 
port 5900 will be forwarded into the QEMU VNC server.

Hope that's of some help.

-- 
-- Michael "Soruk" McConnell
   Eridani Star System

   MailStripper - http://www.MailStripper.eu/ - SMTP spam filter
   Mail Me Anywhere - http://www.MailMeAnywhere.com/ - Mobile email

Re: [Qemu-devel] Using QEMU as a terminal server?

[Alexandre Leclerc]

Michael,

Thank you for your help. Now I know it is possible. I'll try to figure
all that out. If you know any links on the web that could help me on
some specific points, I'll be glad to have a look at them.

Best regards.

2007/1/12, Michael McConnell <soruk@eridani.co.uk>:
> Alexandre Leclerc wrote:
> > Hi all,
> >
> > I was thinking to something weird, but I don't know if it is totally
> > doable. So I ask your expertise. (Being under Linux to use W2K
> > images.)
> >
> > - ssh login.
> > - then the login script launch a qemu session without the X session
> > (running without visual).
> > - there would be UltraVNC server inside the OS
> > - find a way to catch the nat ip address of this new qemu session
> > - trhu the ssh tunel, connect UltraVNC viewer to server.
> >
> > Here we go I have a nive 'Terminal Server' connection.
> >
> > Ok, if the ssh thing is not working, or simply, let us remove this
> > aspect; would such a thing be possible?
> >
> > Having something like that would be amasing because then doing
> > windows-like terminal server on linux becomes possible. You map the
> > sessions in read-only to a master image file and there you go.
>
> I do something very similar.
>
> My localnet uses IPs in 192.168.a.0/24, and my QEMU sessions operate on
> separate 192.168.b.x/30 subnets, and for my Win2000 QEMU session I have
> ipchains NATing outbound connections and transparently forwarding a
> 192.168.a.y address that is aliased on the host's eth0 (the host handles
> 192.168.a.z as normal) to the 192.168.b.x/30 address used within QEMU. I
> then just open a VNC connection to 192.168.a.y port 5900, and it all
> works fine.
>
> This forwarding means my net-facing box which handles inbound SSH from
> the internet can "see" the QEMU virtual machine without requiring a
> second level of port-forwarding.
>
> My ssh looks something like this, from the outside world:
>
> ssh -L5944:192.168.96.y:5900 -C username@hostname
>
> The -C compresses, and despite VNC doing a lot of compression on its
> own, this does help, especially on low-bandwidth connections (e.g.
> dial-up, GPRS)
>
> If you want to use user-mode networking instead of the tunnelling
> device, use the "-redir tcp:5900::5900" option for QEMU, then the host's
> port 5900 will be forwarded into the QEMU VNC server.
>
> Hope that's of some help.
>
> --
> -- Michael "Soruk" McConnell
>    Eridani Star System
>
>    MailStripper - http://www.MailStripper.eu/ - SMTP spam filter
>    Mail Me Anywhere - http://www.MailMeAnywhere.com/ - Mobile email
>
>
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> Qemu-devel mailing list
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>


-- 
Alexandre Leclerc