RE: TCP/IP and NT -- MIDRANGE-L

Michael,

It depends. Do you have other machines that need to access both 
the NT Server, the Internet and the AS/400?

If not, then you could assign the AS/400 an IP from the 10.1.1.x 
network.  Then on the NT box, give it a second IP address that 
is in the 10.1.1.x network.  This way, it would be able to talk 
to both networks.

If you have other machines that require IP access to the AS/400 
and the Internet, you could turn IP forwarding on your NT box. 
 With the appropriate routes on the NT server, it would act as a 
router for your other machines (with InterNic assigned address) 
use the NT box as a router.  You would have to change their 
Default Gateway to be the NT box.

You may also be able to set this same thing up on your Internet 
router.  There are actualy several ways you can achive your 
goal.  This is just 2 of them.  There are probably others and 
they might even be "better".

If your AS/400 has an IP address of 10.1.1.x, the NOBODY from 
the Internet will be able to get to it.  Unless of course they 
telnet to your NT box (assuming TelNet is on) and then telnet 
from the NT box to your /400.  But barring this, every router in 
the Internet will throw a 10.1.1.x (Actually, 10.anything) 
source or target address out...so you are very safe....unless 
the hacker gets into a box that will can see both networks.  And 
then if your have NAT (Network address translation) active 
someplace, all bets are off.

Not meaning to start another NT vs AS/400 or "stinking NT" 
discussion, but do not be ashamed of having an NT server!  There 
are some things the AS/400 JUST WON'T DO!  And a few that it 
won't do well.  Especialy if you are not on V4R2. Not to mention 
legacy stuff.  Pick the tool appropriate for the job.

Regards,
Bob Crothers
Cornerstone Communications

PS: There are several "local network address ranges" defined. 
 10.anything is just the one I use.  You should definitely use 
one of the official local network ranges for your arbitrary IP 
address's.


-----Original Message-----
From:   Michael J. Guzak [SMTP:mguzak@ican.net]
Sent:   Thursday, March 05, 1998 9:46 AM
To:     Midrange List (E-mail)
Subject:        TCP/IP and NT

In all the documentation regarding running TCP/IP on the AS/400, 
it always states that if you are not going to connect to the 
Internet, you can arbitrarily use any IP address.  I wish to run 
TCP/IP between my NT server and my AS/400.  The NT server will 
be connected to the Internet.  I have no need/desire to make the 
AS/400 accessible or visible to the Internet.  Can I still use a 
dummy IP address on the 400 ?  Will this cause a problem ?  Is 
this a secure solution or should I consider some other method? 
 BTW, this post is not meant to invite questions as to why I 
have an NT Server.  I just do.



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