Routing and Remote Access Service (RRAS)

Definition of Routing and Remote Access Service (RRAS) in The Network Encyclopedia.

What is RRAS (Routing and Remote Access Service)?

An add-on for Microsoft Windows NT Server version 4 with Service Pack 3 or later that provides additional support for TCP/IP internetworking, including the following:

  • Routing Information Protocol (RIP) for Internet Protocol (IP) versions 1 and 2, which allows a multihomed server running Windows NT to be used as a dynamic RIP router for small to medium-sized IP internetworks.
  • Open Shortest Path First (OSPF) Protocol, which allows a multihomed server running Windows NT to be used as a router for large IP internetworks in autonomous systems.
  • IP packet filtering, which allows a multihomed server running Windows NT to be used as a packet-filtering router. Both input and output filters can be configured for each TCP/IP interface and can be configured based on the contents of key header fields in IP, Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Internet Control Message Protocol (ICMP) packets.
  • ICMP router discovery, which supports automatic discovery of default routers by hosts using ICMP router advertisement messages.
  • Dynamic Host Configuration Protocol (DHCP) relay agent support for enabling DHCP clients and DHCP servers to reside on different networks.
NOTE

Routing and Remote Access Service (RRAS) replaces the existing Remote Access Service (RAS) on Windows NT 4 and fully supports the existing capabilities of RAS. For information on RRAS for Windows 2000, see the entry on Routing and Remote Access elsewhere in this chapter.