RE: Routing between internal subnets
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 22 Sep 2004 20:57:21 -0500
Hi Alexy,
All addresses behind a single interface are considered part of the same
network. While the ISA firewall will route back to networks located
behind that interface, it won't implement user/group access control
because the Firewall client uses this information to determine which
connections should use Direct Access, i.e., not loop back through the
firewall to access resources on the same network. This improves the
performance of the firewall since looping back isn't part of performance
best practices :-)
Do you have a network diagram? I'm not clear on what you're exactly
trying to accomplish.
Thanks!
Tom
www.isaserver.org/shinder <http://www.isaserver.org/shinder>
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7 <http://tinyurl.com/3xqb7>
MVP -- ISA Firewalls
-----Original Message-----
From: UNE-Alexey Fernandez, J' Grupo Tecnico OEB TI
[mailto:alexeyf@xxxxxxxxx]
Sent: Wednesday, September 22, 2004 10:54 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Routing between internal subnets
http://www.ISAserver.org
Hi to all,
Dear colleagues, I'm facing the following challenge:
I want to take advantage of multi-networking feature of ISA
Server 2004, to serve internet via a main ISA server (2 physical
interfaces) at the top level domain of a network with a lot of branches
connected to it with HDSL and concentrated in 3 Cisco routers, all the
internet request are finally served by an ISA Server 2004 for all the
subnets in 172.0.0.0/14. Each subnet belongs to a particular domain in
the domain tree (not all domains are integrated to active directory).
The question is how to divide the IP traffic between these subnets so
that the internal traffic could be routed between subnets and internet
traffic goes outside via ISA Server enabling it for NAT to some subnets
(= sub domains in my case), for firewall clients to other subnets and
only for web proxy to other subnets?.
I was working around it by defining Networks, Networks Rules and
Firewall Policies, but when I declare a Network with some subnets, these
subnets can't reach the rest of subnets and vice versa, and the main
problem, these subnets can't reach ISA Server internal interface; even
when I declare the Network Rule and Policies enabling protocols and
routing between them. I think I am apparently still missing something. I
only reach routing between subnets when I include all subnets in the
single predefined network "Internal", but I need to separate it due to
the internet access I need to apply to each subnet (need for
authentication, NAT, Firewall Client, etc.)
Thanks in Advance,
Lic. Alexey Fernandez Suarez
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