ISA Server 2000 Routing certain http requests to a different gateway.

Posted on 2004-10-29
Last Modified: 2013-11-16
My company uses Oracle applications that is hosted outside the organization. Oracle requires a VPN connection to access the apps. The apps are browser based.  The VPN connection exisits at our corporate office, we connect to them via a WAN on a Point to Point T-1. We also have our own inhouse T-1 for internet access so we do not use up bandwith on the WAN. We use ISA server as our Internet gateway.
Here is my problem,
In order for http requests to the Oracle application to work, we could not use the ISA client software, we had to switch to secure NAT.
Then we had to assign a route to the client computers via a logon script directing all Oracle requests through the P2P router. Everything else goes through the default gateway (ISA). This has worked fine but now I have an issue with Internet abuse. I need to enable content rules on the ISA server by "Users" or "Security Groups". My users are in a mixed environment of thin clients connecting to a Terminal Server and desktop computers. I do not want to restrict activity via the IP address of the client computer. This will cause problems with my Terminal clients. I have managers who use the terminal and need full internet access, but I have others who just need access to our Oracle applications. My delima is, I know I have to use the ISA client to gain this type of control. But I can not use Proxy because it will not route the oracle requests to the proper router on the lan. Is there a way to use the ISA client and tell ISA that all http requests to Oracle applicaitons get routed to the P2P router? I tried telling IE not to use the proxy for local intranet address and I put the addresses in the selection box but it still does not work.
Question by:bryandillon
    LVL 9

    Accepted Solution

    Try this, if I udnerstand correctly.
    In your ISA you need the IP addresses added into the LAT table that constitute your P2P routed network.
    For example....if your oracle traffic is to NEVER leave  ISA, but rather be directed to the P2P network of 192.168.1.x/24, then you need to add a lat entry  in ISA console for TO
    This will tell ISA to NOT send any traffic for that IP range out of it's internet connection.

    Next...does ISA know how to find the P2P network? From ISA, can you ping or tracert to the P2P network? If so, good. If not, then you need to add a static route to ISA's route table stating anytihgn going to 192.168.1.x needs to be routed TO x.x.x.x (IP of the network side of your P2P network.

    Now set your proxy settings on your client to hit ISA. Traffic for the internet will be routed to internet. Traffic for P2P IP addresses will be sent there. Your thinking that this didn't work before when I tried it? Well, it didn't because ISA had no way of knowing that the IP addresses of the p2p network were INTERNAL and routed everything to the web that is NOT in it's LAT table. Give it a shot.

    I am somewhat confused why your needing clients set to Secure NAt (DG of ISA IP) to get an internal vpn connection to be negotiated to the P2P network. No need to explain, I am just thinking outloud.

    Try the above and let us know.

    Author Comment

    This thought did come to me over the weekend and I added the address to to LAT and it still did not work. But once I added the static route to the ISA (per your suggestion) with the combination of the LAT it worked great!  Now I get to have fun trying to setup content rules. Thanks!
    LVL 9

    Expert Comment

    And thanks for the points

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    How your wiki can always stay up-to-date

    Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
    - Increase transparency
    - Onboard new hires faster
    - Access from mobile/offline

    Do you have a windows based Checkpoint SmartCenter for centralized Checkpoint management?  Have you ever backed up the firewall policy residing on the SmartCenter?  If you have then you know the hassles of connecting to the server, doing an upgrade_…
    The DROP (Spamhaus Don't Route Or Peer List) is a small list of IP address ranges that have been stolen or hijacked from their rightful owners. The DROP list is not a DNS based list.  It is designed to be downloaded as a file, with primary intention…
    With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

    933 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    19 Experts available now in Live!

    Get 1:1 Help Now