Re: Any Vulnerability Associated with Sharing single printer?

From: Stewart Smith (stewart@gammasolutions.com)
Date: 09/18/02 

From: Stewart Smith <stewart@gammasolutions.com>
To: jove@gaza.halo.nu
Date: 18 Sep 2002 10:44:35 +1000

In my experience (at least with Epson printers, and i'm talking old
inkjets here) the printer had a sort of "lock" itself, so that if two
people tried to print at once, one got an error message (the printer is
in use) and the other got to print.

i.e. I was working fine with a PC on one end (via parallel) and mac on
the other (via serial) and could print from both. And yes, I tried
hitting "print" at the same time, and it all was okay.

On Thu, 2002-09-12 at 04:33, jove@gaza.halo.nu wrote:
> Reza,
>
> Yes there could be some risks associated with such an undertaking
> most notably a race condition when data is recieved from both the rs-232
> port and the parallell port. Due to faster speed from the parallel port
> this type of race condition would be more seemlessly attacked from the
> workstation connected to it. My advice to you would be to include a
> security device that can interrupt voltage and amperage to the printer in
> a binary fashion (on/off) in some sort of a device that could be toggeled
> to two different positions (if anyone on the list knows of such a device
> by all means, chime in). Hope that helps.
>
> Regards,
> jove
> -------
> Every time I think it can't get worse
> I just have to check my e-mail
>
> On Wed, 11 Sep 2002, Reza Ghaffari wrote:
>
> > Does any one know if there is any risk associated with allowing two
> > different users share a printer on printer's separate ports? One will be
> > using its serial port and the other one will be using its parallel port.
> > Thank you.
> >
> > (BTW, Printer model is a HP 2250TN or HP 2280TN)
> >
> > Regards,
> >
> > Reza Ghaffari
> >
> > 

-- 
Stewart Smith
stewart@gammasolutions.com
Programmer / UNIX Sys Admin

Gamma Solutions Pty Ltd
Monash Corporate Centre,
Unit 11, 20 Duerdin Street,
Clayton, Victoria 3168
Phone:  +61 3 9562 7755
Fax:    +61 3 9562 7766
Mobile: +61 4 3884 4332

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