RE: ISA Publish Scenario
- From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 9 Aug 2004 18:28:00 -0700
1. I was taught from the get go to when ever and where ever possible, do not
use the same internal domain name for AD as the external name.
2. Doesn't Windows Server 2003 DNS allow stub zones or such, to where you
can include some records, and all others send to another server?
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
> Sent: Monday, August 09, 2004 6:14 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: ISA Publish Scenario
>
> http://www.ISAserver.org
>
> Hi William,
>
> It sure would be nice if the Microsoft DNS supported views, it would
> make life a lot simpler. As it stands right now, you need to use two
> separate machines to host the Internal and External zones.
>
> Tom
> www.isaserver.org/shinder
> Get the book!
> Tom and Deb Shinder's Configuring ISA Server 2004
> http://tinyurl.com/3xqb7
> MVP -- ISA Firewalls
>
>
>
> -----Original Message-----
> From: William Holmes [mailto:wtholmes@xxxxxxxxxxxxxx]
> Sent: Monday, August 09, 2004 8:01 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: ISA Publish Scenario
>
>
> http://www.ISAserver.org
>
> Hello Tom,
>
> The next question is does Microsoft intend to support a DNS server that
> handles a split DNS environment? That is similar to views that are
> available
> in Bind 9. When a request is made from an internal host you should get
> one
> set of information. When the request comes from an external address you
> should get another.
>
> In our environment we are not primary on our dns so its quite difficult
> to
> set up a split DNS. I could change the zone file after receiving it from
> the
> primary name server but that's quite ugly.
>
> Thanks
>
> Bill
>
> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
> Sent: Monday, August 09, 2004 8:48 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: ISA Publish Scenario
>
> http://www.ISAserver.org
>
> Hi William,
>
> The answer is *always* to create a split DNS. The ISA firewall really
> doesn't
> like looping back through itself for requests from Internal network
> clients.
> As you're noticed, when SecureNAT clients try to loop back through the
> ISA
> firewall, it doesn't work because the ISA firewall isn't proxying the
> request. It will work at times with the Firewall client (since its
> acting as
> a Winsock proxy) and will always work with the Web Proxy client.
>
> Also, the ISA firewall doesn't have an integrated mode. You also get all
> firewall features with the ISA firewall, although you can cripple it by
> installing it in single NIC mode.
>
> HTH,
> Tom
>
> -----Original Message-----
> From: William Holmes [mailto:wtholmes@xxxxxxxxxxxxxx]
> Sent: Monday, August 09, 2004 7:25 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] ISA Publish Scenario
>
> http://www.ISAserver.org
>
> Hello,
>
> I am setting up ISA 2004 to publish several web servers. I have a
> diagram at:
> http://www.cs.cornell.edu/~wtholmes/publishingsetup.htm
>
>
> With this setup there is a split routing problem and I was wondering if
> there
> is a way to fix this within ISA.
>
> The external listener on the ISA server is on the DMZ network. When a
> web
> request comes into this listener from an external client everything
> works as
> expected. The request goes through the Checkpoint firewall to the DMZ to
> the
> ISA server which requests the page from the appropriate back-end web
> server.
>
> However when the request comes from an internal client it passes through
> the
> checkpoint firewall to the ISA server which responds its internal
> interface.
> This creates a split route. The checkpoint firewall seeing the incoming
> request but never seeing the outgoing request drops the connection. The
> ISA
> server sees a request coming to its external interface from a subnet
> that
> should only appear on its internal interface and also drops the
> connection.
>
> Solutions not involving ISA:
>
> 1. Create a split DNS so that requests for
> http://isaserver_listener_address
> from an internal host are directed to the internal network interface on
> the
> ISA server.
>
> 2. Modify the routing tables in the CISCO router to redirect requests to
> the
> DMZ listener's address on the ISA server to the internal ISA server
> address.
>
> 3. Configure all clients to use the ISA server as their web proxy.
>
> My question: Is there a way to configure ISA so that requests received
> on its
> external interface are answered on its external interface regardless of
> the
> source IP. In other words when publishing a web site can you ignore
> normal IP
> routing.
>
> The answer is likely a no but I just thought I would ask.
>
> Thanks
>
> Bill
>
> William Holmes (MCP)
> Department of Computer Science
> 310 Upson Hall
> Cornell University
> Ithaca, NY 14853
> wtholmes@xxxxxxxxxxxxxx
> 607 255-1757 (o) 607 227-6049 (c)
>
>
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