Great Circle Associates Firewalls
(October 1996)
 

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Subject: IP forwarding and bind()
From: Colin Campbell <sgcccdc @ citec . qld . gov . au>
Date: Fri, 11 Oct 1996 15:20:17 +1000 (EST)
To: firewalls @ greatcircle . com

Hi,

A question based on my ignorance comming up ...

	Consider the following machine, with two
	ethernets (A, B) and IPFORWARDING turned OFF


		-------------------LAN A
			|
			|
		    ---------
		    |   A   |
		    |       |
		    |       |
		    |   B   |
		    ---------
			|
			|
		-------------------LAN B
		    
	One process bind()s itself to IP-A and another
	bind()s to IP-B. Both are on the same port.

If I attempt to connect from LAN-A to IP-B ...
    
    On which machines will I get an answer from the
    process bound to IP-A?

    On which machines will I get and answer from the
    process bound to IP-B?

    On which machines will I get no answer?

Colin

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