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RE: [Xen-users] Xen Console

Hi guys,

I've been playing around with the built-in VNC and VNC server installed in
my HVM DomU these few days.

I realise if I will to sniff the packets in the network, I will be able to
pick up RFB packets between my host and my RealVNC server installed in the

In contrast, there don't seems to be any RFB packets picked up by my
packet-sniffer when I'm using the built-in VNC. 

Why is that so? What is the different between the connection of this two

Nathan Eisenberg wrote:
> Aside from the security issue of using the built in VNC server, there is
> also a huge performance impact because of the way that the interface
> operates.  Using a VNC server installed on the guest OS does not cause the
> same kind of issue.  I highly recommend avoiding the use of the built in
> VNC server for anything but administrative tasks.
> Best Regards
> Nathan Eisenberg
> Sr. Systems Administrator
> Atlas Networks, LLC
> support@xxxxxxxxxxxxxxxx
> http://support.atlasnetworks.us/portal
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Chris 'Xenon'
> Hanson
> Sent: Tuesday, June 23, 2009 6:55 AM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Xen Console
> Jingwei Tan wrote:
>> Hi Guys,
>> 1. Beside SDL, VNC, and Virt-Viewer is there any console application Xen
>> uses?
>   I can't think of any. What were you looking for?
>> 2. Is SDL - Simple DirectMedia Layer?
>   Yes. http://en.wikipedia.org/wiki/Simple_DirectMedia_Layer
>> 3. When I'm using VNC, I am able to establish a VNC connection to my
>> DomU without installing VNC on it. Where exactly is the VNC server and
>> client? Will I be able to establish such connection remotely?
>   The VNC server is built into Xen and utilizes Xen's emulated video
> hardware. The client
> is wherever you are running the client. If you have Xen attach the VNC
> server to an
> address that is accessible to more than just the local Xen Dom0 machine
> (ie, bind to
> or another real ethernet interface instead of just then
> you will be
> able to access the VNS server from anywhere on the net you can reach that
> interface from.
> Be mindful of the security issues of this.
>> Tan
> -- 
> Chris 'Xenon' Hanson, omo sanza lettere                  Xenon
> AlphaPixel.com
> PixelSense Landsat processing now available!
> http://www.alphapixel.com/demos/
> "There is no Truth. There is only Perception. To Perceive is to Exist." -
> Xen
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