A.P. Lawrence

lpd with dhcp

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Date: Wed, 07 Nov 2001 18:06:08 -0500
From: Tony Lawrence <tony@aplawrence.com>
Subject: Re: Ethernet Terminals, DHCP and printing References: <8947fc5.0111070948.95c8c5e@posting.google.com> <20011107185117.GC1387@jpradley.jpr.com> <hYiG7.6779$35.802405@iguano.antw.online.be>

Karel Adams wrote:
> 
> "Jean-Pierre Radley" <jpr@jpr.com> schreef in bericht news:20011107185117.GC1387@jpradley.jpr.com...
> > Keith Clay propounded (on Wed, Nov 07, 2001 at 09:48:47AM -0800):
> > | Folks,
> > |
> > | We are considering moving from a serial terminal server to ethernet
> > | terminals served by DHCP.  They are ET2000 terminals from ComputerLab
> > | and they have a printer port.  Is it possible to set the printers up
> > | so that they can be printed to from the SCO lpd spooler.
> >
> > The 'D' in DHCP stands for 'Dynamic', so how will you know which printer
> > resides at which IP address?
> 
> <very humbly>
> I always understood DHCP allocates dynamic IP adresses to
> fixed host names. So it would seem to me that there must be a way
> to set up a remote printer port associated with a fixed host name,
> then leaving the rest to DHCP.

No, not quite.

However, all is not lost.  

First, Visionfs printing only needs a Netbios name- so that would work,
but not for you :-)

Secondly, if you know MAC addresses (and you can always get that info),
you can get the ip address from arp -an and adjust things as
necessary.   That aassumes of course that you are on the same lan and
that some other communication causes arp to be there- a ping will do, of
course. 

If a particukar user needs printing to go to their lpd server, that's
easy. I've done that sort of thing for printing over the internet where
someone comes in over ssh from who knows where, but a quick shell script
picks up their ip and modifies /etc/hosts with the new info.  This
sounds like it might be what your situation needs- only the user needs
access to their printer?  If so, define the hosts by name in printcap
and just modify /etc/hosts as they login- watch out for race conditions-
you need to be careful here.

So yes, you can do this.  Just takes a little creativity and some
careful scripting.

 
--
Tony Lawrence
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