From: Henning, Thomas B (thomas.b.henning@usa-spaceops.com)
Date: Thu Mar 11 2004 - 08:29:31 EST
All:
Original email and questions are quoted below.
Thanks are due to (in order of receiving their replies):
Chris Medaglia
Rick Jones
John Adams
Ryan Green
All Marillier
Steve Illgen
John Lee
The answer to question #1, can I bring NIC's up and down on the fly is yes, it can be done easily. I will have to be careful of things like default routes, DNS and any other connections made on the side being switched off. I was aware of most of these (I had forgotten about default routes) but will take care of them. Since the "secure" side of this switched connection is only one hop deep, I don't think I'll run into much trouble over the default routing.
One additional comment in reference to a comment made by Rick. Due to other considerations here, just using one NIC and leaving a cable hanging is not a good solution. We have decided to implement the "Air gap" the other group wants by adding two low cost switching hubs and configuring power to have only one on at a time via a switch on the operations console. Each NIC is connected to the different network via one of these hubs. This will be much easier to control for us than leaving a cable hanging, and with quality seals on everything no one should be changing them configuration, even me.
The short answer to question #2 is that Starbase binaries are provided with PA-RISC servers, but it is generally accepted that openGL is the wave of the future. I will look into porting the code we are using with the Starbase libraries in my copious free time.
Thanks again all.
Tom
> -----Original Message-----
> From: Henning, Thomas B
> Sent: Wednesday, March 10, 2004 2:25 PM
> To: 'hpux-admin@dutchworks.nl'
> Subject: FW: Changing LAN connections on the fly and Starbase on 11.11 server
>
> All:
>
> Question #1:
>
> I have a system going in that needs to connect to two different networks, at different times. The owners of one network, (different group, the usual story) insist that it be protected by an air gap from everyone else, but would allow me to connect to it to collect data from the machines on this network, if I am isolated. Since I also need to be connected to the campus network, except when I am collecting this data, I have to configure the system with two NIC's and a switch that will kill one connection before making the other connection.
>
> My question is: can I change the active LAN connections on the fly so that when one net is connected that NIC is active and then when the other net is active the other NIC is? They will be on two different NIC's (different speeds also). I was thinking it could be done with a script file that took lan1 down and lan2 up, or the other way around, depending.
>
> I know I will lose DNS when the campus net is down, but the hosts on the isolated LAN Are small in number and should not change address so /etc/hosts is fine for that.
>
> Question #2:
>
> I am looking at purchasing a new server to replace the J282/2 workstation I have been using as a server for a number of years. Does anyone know, while I am waiting on the answer from the HP sales rep, if starbase is supported (or even if it just runs) on a rp5405 box running 11.11? I use starbase to generate data plots and various other graphics and if it's not supported I'll have to start re-writing or buy another workstation to be used as a server.
>
> Am I out of my mind, again? Thanks is advance for any answers.
>
> Thomas B. Henning
> United Space Alliance
> Ground Operations
> Wave Analysis Lab
> (321)861-4234
> thomas.b.henning@usa-spaceops.com
>
> Opinions expressed are my own and do not reflect those of my employer or NASA.
>
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