On Mon, 20 Oct 2003, Patrick Powell wrote:
PP> SNMP runs over UDP. The network security issues can be hideous or
PP> trivial, depending on the approach you take.
Yeah. By using a private VLAN for the printers (like you have to do anyway
to protect them from TCP :]), I believe this is not a security issue
anymore. But it is something to consider as a con on a non-private VLAN of
course.
PP> If you use SNMP, then you have to fight through the various OIDS, and
PP> then make sure that the values you get for 'end of job' really do
PP> match the 'end of job'. You also have to make sure that the
PP> Pagecounter value is really the right value.
I guess you mean you have to be sure the job really has ended, that is
wait for the printer to become idle (as if it is down it might have run
out of paper and still want to continue printing later) and so on and so
forth? And for the right value, you have to be sure it is counting
impressions if that is what you want?
PP> If you use PJL/Postscript, then you have to fight through the various
PP> PJL insanities, and hope that PJL Echo, PJL JOB/END, etc., work. If
PP> you are using USTATUS, then you need to make sure that you really do
PP> get status :-) You also have to make sure that the Pagecounter value
PP> is really the right value.
So the major thing with PJL is that the commands are not supported or do
basically not work as specified? Going into PJL insanities, could you give
more details on these? USTATUS being PostScript right? What else would you
get if not status? Comparing these two options, is PJL more support/a
better choice then PostScript, or would you say that you have to try with
both options depending on printer?
I have a pretty good idea of the success ratio of using SNMP and that you
cannot trust that a printer supports (meaning returns intelligent values)
even though the manufacturerar says so. (Canon being a bad one here and
Xerox a good one.)
What is the success ratio of PJL/PS? Beinh behind IFHP you should have
some idea on the success people have had with it?
PP> It is a case of death by fire or death by water.
PP>
PP> Patrick ("You get to choose") Powell
Concerning your SNMP implementation in IFHP, you might want to read my
experiences in my report later on (those I haven't shared so far) and look
at my implementation, so you can work around them if you don't already
have.
There are some interesting special cases and solutions that I ran into
when testing SNMP with 10 or so printers. I currently do not have time to
dig into the SNMP test release if IFHP myself right now. :-(
Henrik
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