Windows Server 2003 supports routing with the RRAS, or Routing and Remote Access Service. RRAS is an effective interior router (routing between internal IP networks) for businesses large and small, as well as a very good border router and remote access server.
What is Routing and Remote Access Service (RRAS Jun 12, 2012 Configure a Windows Server 2003 VPN on the server side Jul 26, 2005
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When the Routing and Remote Access Wizard completes, you might see the message "Windows was unable to add this computer to the list of valid remote access servers in the Active Directory. Before you can use this computer as a remote access server, the domain administrator must complete this task." If you see this message, click OK. Later, after Apr 28, 2012 · Once added the second network card, go to the start menu -> Administrative Tools -> Routing and Remote Access. Note for Windows Server 2008 : On Windows Server 2003 you can see that this feature is already installed but on Windows Server 2008 this isn't the case. On Windows Server 2008, you must add the role "Services Network Policy and Access".
Creating Routing and Remote Access Policy and Remote Access Permissions in Windows Server 2003 – Including EAP-TLS Authentication for PPTP and L2TP/IPSec Clients . The Routing and Remote Access Service (RRAS) on the ISA Server firewall/VPN server uses Remote Access Service Policies to determine what VPN connections should be allowed or denied.
Routing and Remote Access - Maximum ports limit - Petri Nov 13, 2006