Re: [foxboro] Architecture problem

Hi Ed,

  As I mentioned in the first post we normally use PCs and Exceed to manage
our I/A systems.  90% of the work I do is from the comfort of my desktop PC.
I only do major ICC work and ALL display editing directly on an AW51.  The
ICC stuff is too risky from a PC, and a display drawn on a PC generally
looks terrible on a Sun computer.

  Logging in to each of our I/A systems from a PC uses the same basic
process.  We use the script utility "Xstart" that comes with Exceed to make
the connection, but any type of telnet program could do the same thing (as
long as the X server is running first on the PC). 

  The PC user is logged into the I/A system as a user named "ia".  This
causes a login script called
"/opt/ia/.profile"  to run which starts up the appropriate Display Manager
or FoxView and routes it to the PC.

  I have modified the .profile script to disable the print screen and the
blink task due to conflicts when using the old display manager and FoxView
at the same time on the same PC.  This would not be a good idea if you are
using the PC as an operator workstation, but we just use PCs for engineers
and managers.

  To log in from an AW51 I just pull up a VT100 window, and rlogin to the
other AW51.

  rlogin "IPADDRESS" -l ia

  A password prompt come back, and type in the user ia's password.  A few
moments later a display manager magically appears (providing you have a free
DM license slot available on the other machine).

  If the ip address of the other AW51's second ethernet card is in the
/etc/hosts file you can just use the name of the other machine instead of
"IPADDRESS".

  This causes the exact same .profile login script to run.  The AW already
has an X server running, so Exceed is not required.  

  One problem with using two different I/A systems is the when you log in
from the AW51 using the old Display Manager to the AW51 using the new
FoxView it whacks out the color palette.  This causes color changes in the
currently running Display Manager and they seem to last until the Display
Manager is restarted.  This is one of the reasons I seldom log in from one
AW51 to another, but IS possible.

  Logging in from the FoxView machine to the Display Manager machine does
not cause this color shift to occur.

  Note that using Exceed on a PC or going direct from one AW51 to another
uses the SECOND ethernet card on the  AW51s, with our corporate LAN in
between.  You have to balance the convenience of this against the very real
security and operational risks.  We have a Cisco router attached to each I/A
system, and all traffic between the corporate LAN and each I/A system goes
through the routers.  Foxboro has a nice document on FoxRemote that covers a
lot of the security concerns of connecting the I/A system to the outside
world.

 Steve Murray
Asarco

-----Original Message-----
From: Ed Zychowski [mailto:Ed.Zychowski@xxxxxxxxxx]
Sent: Wednesday, February 20, 2002 4:13 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Architecture problem




Steve,
Sorry if I misunderstand you but are you saying you can use an AW51 to do
the same thing as you do with Exceed on a pc? Can you pull up displays from
another node from an AW? You wrote "log in as user "ia" where do you do
this? from a vt session? This sounds very interesting. Please let me know
if this is what you ment or if I misunderstand.

Thanks!


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