Configure the ISA Server in the internal network

Configuring a router is very important for networking. How can I configure ISA Server in an internal network with multiple routes? In the internal networks of many enterprises, due to the large number of computers or the isolation of departments, multiple subnets or VLANs are usually divided, and subnet VLANs are implemented through layer-3 switches or routers) interconnection. Many of my friends raised this question. If I have configured a connection to the Internet on a vro in one of the subnetworks, how should I configure the ISA Server 2004 router, so that customers in other subnets can share the Internet connection of this subnet?

In this article, I have introduced "How to: configure the ISA Server network environment on a router" in "talking about routes in ISA Server 2004 and KWF, I will give you a detailed description of how to implement it on the ISA Server. When multiple routes exist in the internal network, because the ISA Server cannot set the internal interface IP address as the default gateway, you must manually add routes to these subnets; in addition, you need to define these subnets as internal networks in ISA Server. Otherwise, ISA Server will warn you of router configuration errors. After the vro is configured, the ISA Server considers these subnets to belong to the internal network, and any access rule settings for the internal network apply to these subnets.

Note: In this article, I did not detail every detail of specific operations, such as how to install ISA Server, how to configure access rules on the router, and so on, these methods have been introduced in many articles on the ISA Chinese site. I hope you will be familiar with ISAServer operations when reading this article, I also have some knowledge about networks and routes. This article has jumped out of the ISA Server category. It is more about network routing. If you want to better master it, we recommend that you read the books on how to implement basic Windows Network Services and CCNA 216 in MCSE 70-801. In addition, please do not ask me in the forum how to use the route command to add routes, WIndows Help is the best teacher. Is our test network:

LAN1172.16.1.0/24) and LAN2172.16.2.0/24) connect the two subnets through the Router. Client1 in the 172.16.1.0/24 subnet wants to access the external network through the ISA Server Firewall connected to the 172.16.2.0/24 subnet, server1 is an FTP server on the Internet. The TCP/IP Settings of each computer are as follows. In this experiment, DNS operations are not involved, and the IP addresses of the DNS server are all set to null. The Router is only responsible for the routing between the two subnets, but not in this experiment:

 
 

  
  
Client1：   
  
  
IP：172.16.1.2/24   
  
  
DG：172.16.1.1Router）   
  
  
Router：   
  
  
LAN1 Interface：   
  
  
IP：172.16.1.1/24   
  
  
DG：None   
  
  
LAN2 Interface：   
  
  
IP:172.16.2.254/24   
  
  
DG：None   
  
  
ISA Server：   
  
  
LAN2 Interface：   
  
  
IP：172.16.2.1/24   
  
  
DG：None   
  
  
Internet Interface：   
  
  
IP：61.139.0.1/24   
  
  
DG：61.139.0.1   
  
  
Server1：   
  
  
IP：61.139.0.8/24   
  
  
DG：None