Forum: NGINX only allow traffic from specific servers

BACKGROUND:
I will be setting up two servers on a hosted platform.  I plan to use 
NGINX
as a front-end proxy for APACHE. Let's call the two servers App Server 1 
and
App Server 2. I also have a server on another hosting platform and that 
has
my home page. Let's call that OUTSIDE Server. App Server 1 and App 
Server 2
will house the application. When the user clicks on the sign in button 
on
the OUTSIDE Server, the user will be redirected to App Server 1. Basic
round-robin load balancing through NGINX on App Server 1 will assign the
user to sign in on either that server (App Server 1) or on App Server 2.

QUESTIONS:
(1) I want to only allow App Server 1 to accept traffic coming from 
either
OUTSIDE Server or App Server 2. Even if the user had bookmarked App 
Server
1, they will need to go back thru OUTSIDE Server to sign in.  How do I 
do
this with NGINX?
(2) Very similar issue with App Server 2, except that it can only have
traffic coming from App Server 1. How do I do this with NGINX?

Thanks for any suggestions!

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,236220,236220#msg-236220

On Thu, Feb 14, 2013 at 05:55:47AM -0500, mottwsc wrote:

Hi there,

> When the user clicks on the sign in button on
> the OUTSIDE Server, the user will be redirected to App Server 1.

> QUESTIONS:
> (1) I want to only allow App Server 1 to accept traffic coming from either
> OUTSIDE Server or App Server 2. Even if the user had bookmarked App Server
> 1, they will need to go back thru OUTSIDE Server to sign in.  How do I do
> this with NGINX?

If you use nginx to redirect to the app servers, what you seem to want
can't be done.

If you use nginx to proxy_pass to the app servers, what you seem to want
can be done. But doing it is unrelated to nginx. Look at the 
configuration
of the app servers and/or the network devices protecting them.

  f
--
Francis Daly        francis@daoine.org