I am taking a course at a local university and we're using a revision
of "Red Hat Linux Networking and System Administration." In the VNC
configuration section, the text states:

"By default, VNC uses ports numbered 5900 plus the display number. In
this example, the display is :1, so the port number is 5901. If you
were using display number :21, the port number would be 5912."

Is the port designation that is transposed for display number :21
supposed to be transposed to "5912" as stated? Or is this a typo and
should it be "5921?"

TIA,
Dave

tom_sawyer70@yahoo.com wrote:

> I am taking a course at a local university and we're using a revision
> of "Red Hat Linux Networking and System Administration." In the VNC
> configuration section, the text states:
>
> "By default, VNC uses ports numbered 5900 plus the display number. In
> this example, the display is :1, so the port number is

still 5900!!

The display number is like a session number.
Suppose you had 10 users connecting to the same machine.
Each of those persons can have the same port number but a different display
number so that each person will be given a different screen so they can
open up different applications and have different windows open at any one
time. Each screen can't see the other screen but each user will feel they
have the PC all to themselves. Each display runs independently even
though there is only one physical graphics card.

The converse of that is many users connecting to the same port and display.
For example 10 students can connect to port 5600 display :1 so that
they all see what teacher is demonstrating.


> 5901. If you
> were using display number :21, the port number would be 5912."
>
> Is the port designation that is transposed for display number :21
> supposed to be transposed to "5912" as stated? Or is this a typo and
> should it be "5921?"
>
> TIA,
> Dave

tom_sawyer70@yahoo.com <tom_sawyer70@yahoo.com> wrote:
> "By default, VNC uses ports numbered 5900 plus the display number.
> [...] If you were using display number :21, the port number would
> be 5912."

You're correct; it's a transposition typo.
Chris

On Fri, 21 Mar 2008 10:44:04 -0700, tom_sawyer70@yahoo.com wrote:

> I am taking a course at a local university and we're using a revision
> of "Red Hat Linux Networking and System Administration." In the VNC
> configuration section, the text states:
>
> "By default, VNC uses ports numbered 5900 plus the display number. In
> this example, the display is :1, so the port number is 5901. If you
> were using display number :21, the port number would be 5912."
>
> Is the port designation that is transposed for display number :21
> supposed to be transposed to "5912" as stated? Or is this a typo and
> should it be "5921?"
>
> TIA,
> Dave


It's a typo. if it's vnc session :21, then it will use port 5921.

.... to the person that said it's 5900 for all.... that's incorrect.
the TCP Port is incramented... your getting the x-windows id :21
confused with the tcp port that the client connects to.


--
D.A.M. - Mothers Against Dyslexia

see http://www.jacksnodgrass.com for my contact info.

jack - Grapevine/Richardson

On 2008-03-21, 7 <website_has_email@www.enemygadgets.com> wrote:

>> I am taking a course at a local university and we're using a revision
>> of "Red Hat Linux Networking and System Administration." In the VNC
>> configuration section, the text states:
>>
>> "By default, VNC uses ports numbered 5900 plus the display number. In
>> this example, the display is :1, so the port number is
>
> still 5900!!
>
> The display number is like a session number.
> Suppose you had 10 users connecting to the same machine.
> Each of those persons can have the same port number but a different display
> number so that each person will be given a different screen so they can
> open up different applications and have different windows open at any one
> time. Each screen can't see the other screen but each user will feel they
> have the PC all to themselves. Each display runs independently even
> though there is only one physical graphics card.
>
> The converse of that is many users connecting to the same port and display.
> For example 10 students can connect to port 5600 display :1 so that
> they all see what teacher is demonstrating.

Mmmm. Must be a choice of configuration.

I have a Linux machine with VNC enabled. Each person connecting to that port
5901 gets a new session, not a view of the machines monitor.

BTW, you didn't answer his question. :-)



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On 2008-03-21, tom_sawyer70@yahoo.com <tom_sawyer70@yahoo.com> wrote:

> "By default, VNC uses ports numbered 5900 plus the display number. In
> this example, the display is :1, so the port number is 5901. If you
> were using display number :21, the port number would be 5912."
>
> Is the port designation that is transposed for display number :21
> supposed to be transposed to "5912" as stated? Or is this a typo and
> should it be "5921?"

That is a - well spotted - typo. It should be 5921.


--
There is an art, it says, or rather, a knack to flying.
The knack lies in learning how to throw yourself at the ground and miss.
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