Question

how to configure ISA 2006 to work as reverse proxy so that one site can be used internally and from outside

Asked by: gdemoura6555

Hi Experts

I have test environment and soon it should be implemented in production.
Here is the scenario I have setup 5 servers (W2k3) in the lab environment with static ips.  Now 4 out of the 5 servers are in one domain are as follow:

DC1--> Primary DC  --> ip 10.1.1.1 subnet: 255.0.0.0 Default gateway: 10.1.1.3
WEB1--> Sharepoint Server (MOSS 2007) --->  ip 10.1.1.2  subnet: 255.0.0.0 Default gateway: 10.1.1.3
DB1--> Sql2005 carrying the Database for Web1:  ip 10.1.1.4  subnet: 255.0.0.0 Default gateway: 10.1.1.3
ISA1--> ISA 2006   has two NICs

NIC 1:  ip 10.1.1.3  subnet: 255.0.0.0    ----> No default gateway
NIC 2: 172.17.1.2 subnet :255.255.255.0 ----> No default gateway

Server 5 is in different domain:
External: 172.17.1.1 subnet :255.255.255.0 Default gateway: 172.17.1.1

Now I have configured Routing and remote access on ISA. I have also setup the DNS in respective Domains. The DNS in internal Domain has Forwarder pointing to external DNS.

The external dns has Host entry in its DNS for external NIC on ISA.

What I am trying to acheive is internal domain connected to internet. Here external DC is acting as ISP and it's DNS. Ultimate goal is to host a website for internal and external users on Web1. On ISA I shall be configuring Reverse proxy for same.
The site is hosted on Sharepoint and its working fine for internal domain

Can any of the expert suggest if I am in right direction? and what am I missing or what can I do to acheive the same

CJ

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Asked On
2008-08-19 at 16:14:04ID23661537
Tags

Microsoft

,

Windows

,

2003

,

ISA 2006 MOSS 2007 2 Nics Split DNS

Topics

MS Forefront-ISA

,

Network Design & Methodology

,

Windows 2003 Server

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: QuoriPosted on 2008-08-19 at 17:45:10ID: 22265239

You could setup the ISA box in 3-leg perimeter mode and have one of the legs be a DMZ for published servers.

 

by: lavionlinePosted on 2008-08-19 at 23:32:40ID: 22266701

Looking at the current configuration, the setup looks okay to me. It is organisational requirement and invidual preference which may utimately decide what king of network network you'd like to setup. Some people place their web-servers/SPS servers in DMZ network while some would go with the network design you have.

You can definitely go ahead with this network design. Make sure that you run ISA in firewall mode to take it's full advantage. You can run ISA as a edge firewall facing the internet with an Static public ipaddress on the external NIC. regarding your reverse proxy/publishing requirement of website, you can surely host it on your internal SPS server and make that available to the external world.

You can make use of SSL using certificates to make your website secure. As a reference, you can use the folowing article to publish website. This article talks about publishing OWA website using SSL. in similar fashion, you can publish any website on IAS to be available for external users.

Using the 2006 ISA Firewall (RC) to Publish OWA Sites

http://www.isaserver.org/tutorials/Using-2006-ISA-Firewall-RC-Publish-OWA-Sites-Part1.html

 

by: gdemoura6555Posted on 2008-08-20 at 09:49:55ID: 22271651

Thanks for your response guys. Now I have a website hosted by Sharepoint. On ISA policy what should I use Publish Websites or Publish Sharepoint Sites. Also we want to use ISA just for reverse proxy purpose and not as firewall.
The thing is in about setup if I uninstall ISA and ping from external server to internal domain it ping fine and replies back with internal ip(the way I have set it up on external dns) but when I install ISA , it blocks that ping.
Also in firewal policy I configured to Publish Sharepoint sites (not sure if thats what I want). We have not yet brought the SSL certificate for our external site so I am testing with http on port 80. Is that ok?

Following link below:
http://blogs.msdn.com/sharepoint/archive/2007/03/06/what-every-sharepoint-administrator-needs-to-know-about-alternate-access-mappings-part-1.aspx

Thanks again

CJ

 

by: QuoriPosted on 2008-08-20 at 14:23:48ID: 22274088

Publish sharepoint sites.

Add a rule to permit ICMP. Or a rule to permit all/all if you don't want to use its firewall abilities.

 

by: gdemoura6555Posted on 2008-08-21 at 09:39:57ID: 22281389

Hi Thanks for your response. We had some changes from Network guys so I have a little different setup. Hope you guys would help me with that. I have attached both required setup and what I have for testing. Please suggest how I can acheive this. Thanks again

 

by: QuoriPosted on 2008-08-21 at 19:51:27ID: 22285927

Do you presently have a hardware firewall option selected?

 

by: gdemoura6555Posted on 2008-08-22 at 08:24:56ID: 22291005

Not sure where tht option is. Does tht mean ISA will act only as reverse proxy ? Also is above scenario acheivable with one NIC. thanks again

20120131-EE-VQP-002

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