RE: NAT Help

From: Nathan (nathan.grandbois@cerdant.com)
Date: 09/13/02 

From: "Nathan" <nathan.grandbois@cerdant.com>
To: "'Akash Malhotra'" <akash@me.umn.edu>, <security-basics@securityfocus.com>
Date: Fri, 13 Sep 2002 13:25:49 -0400

Well, the person who initiates the connection doesn't have to do anything
with nat, the nat device will automatically map it. On the other side
(recieving) somewhere in your nat device a one to one nat must be done. Ie
192.168.0.1 is the computer the game is on but your public ip is 67.88.99.88
(<-- fake I hope). You'd need to set up the table to say 67.88.99.88 =
192.168.0.1. That's if your device supports one to one nat. If not you'd
need to set up a rule allowing the port of your game access to that specific
IP of the box the game is on. kinda like arp tables.

-Nathan

-----Original Message-----
From: Akash Malhotra [mailto:akash@me.umn.edu]
Sent: Friday, September 13, 2002 11:10 AM
To: security-basics@securityfocus.com
Cc: focus-ids@securityfocus.com
Subject: NAT Help

Hi

I just want to know how NAT wokrs in general.Any help is appreciated.

The reason me asking help abt NAT is i want to know how NAt will behave
when two users are behind NAT is contatcting same applictaion.For Eg

If two users want to play multiuser game and both of them are behind NAT
than how NAT is gonna know who is what??? and how is NAT gonna response to
different packet.

situation can be described below

                         Website -> Game Application
                          | (Multi User Game)
                          |
                         NAT
                          |
                        ------
                        | |
                        user1 user2 ( both are playing with each other)

ANy suggestion on this issue ?? I Want to know the behaviour of NAT

-Akash

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