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VPN on ISA

Configure the user account for VPN access
Configure the ISA Server computer as a VPN server
Configure Routing to another subnet in ISA for VPN client
Configure inside PPTP clients to access a outside VPN through ISA
Interoperability of RRAS and ISA
Permits network traffic between two networks by using Policy rules

 

Configure the user account for VPN access

You can configure the user account properties for VPN access by using Active Directory Users and Computers or by configuring the local computer that is running ISA Server. To configure the user account for VPN access, check Allow access or Control access through Remote Access Policy under Dial-in tab.

Configure the ISA Server computer as a VPN server

To configure the computer that is running ISA Server as a VPN server, you must do all the following:

1. Configure VPN client access.
2. Create a VPN access rule.
3. Verify the VPN network rule.

Configure Routing to another subnet in ISA for VPN client

 

Symptom: you create VPN in ISA server and the VPN clients use different IP range from the LAN. For example, the LAN IPs are 10.X.X.X and the VPN client IPs are 192.168.1.X.


Resolution: you need to add routing table entries  pointing to the internal interface of the ISA server for the off subnet network ID. You can add these manually, or use a routing protocol such as RIP or OSPF.

 

Configure inside PPTP clients to access a outside VPN through ISA

To permit inside PPTP clients to access a outside VPN through ISA Server, you must create a rule to permit PPTP protocol traffic to access the external network.

Interoperability of RRAS and ISA

If you install ISA Server 2004 on a computer that is running 2000/2003 server, ISA Server takes control of the Routing and Remote Access service configuration. However, there are some Routing and Remote Access parameters, such as the Routing and Remote Access tracing level, that are not available through the ISA Server Management snap-in. These parameters can be set directly through Routing and Remote Access.

Permits network traffic between two networks by using Policy rules

To permits network traffic between two networks in both directions, you may want to create Policy Rule. This behavior might be helpful when you configure VPN client connections.

 

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