[olug] Application problem with NATing

[Craig Wolf]

Well, 1-1 Nating looks interesting but I will have to read it a few times to get it to sink in and make sense.  I don't know what you are hinting to me on blind-drops, since it leads to  info about Ben Franklin, unless it is an electricity lesson and then you are on the money!  8)  I think that out of band signaling is a little out of my league of understanding.  I have no control over the server, just the client and the firewall for changing settings.  
Thanx for the help!!

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283


>>> jlh at cox.net 2/7/2004 >>>
1 to 1 NAT (http://www.lug.udel.edu/articles/firewall-1to1nat/1to1nat.html)
OR
If the app behind the firewall/NAT is something that you have written, you
could use a blind-drop (http://www.pbs.org/benfranklin/l3_world_spies.html)
method to establish an out of band signal
(http://www.iec.org/online/tutorials/ss7/topic02.html) from the client to
the server.  I've never seen anything written about it with regards to
computer connectivity but I've used it a number of times to over come this
exact problem.

In a nutshell: you set up an out of band communications link from the client
to the server.  The server, on a regular schedule checks for a signal
somewhere outside the firewall, when it sees the signal it attempts to
establish a connection with the client.  When the client wants to connect to
the server it leaves a signal at the agreed upon "drop box" and waits for
the server to attempt contact.  It is also possible to write a server side
drop box monitor that does the drop box check and then tells the server to
connect to the client.


----- Original Message ----- 
From: "Craig Wolf" <cjwolf at mpsomaha.org>
To: <olug at olug.org>
Sent: Saturday, February 07, 2004 7:09 PM
Subject: [olug] Application problem with NATing


I have a program that connects back to a Unix system (this part is not that
important).  The problem it has is that it has problems with connecting to a
private IP behind my nat'ed firewall.  How could I fool the app into
thinking that there IS no firewall?
I will not be able to get too many details until Monday morning...

Any and all help/ideas would be GREATLY appreciated.

Craig Wolf
Linux Web Server Support
Desktop/Network Specialist
402-894-6283

_______________________________________________
OLUG mailing list
OLUG at olug.org 
http://lists.olug.org/mailman/listinfo/olug 

_______________________________________________
OLUG mailing list
OLUG at olug.org 
http://lists.olug.org/mailman/listinfo/olug