Installation guide

Wave data routing 30-9
Chapter 30: Understanding Wave Data Networking
Wave Global Administrator Guide
IPX supports a simple address scheme that allows clients to communicate with servers residing
in other logical networks, and lets routers determine what traffic needs to flow between different
links. IPX does not dictate that each client and server have assigned addresses, other than the
physical network adapter address. (In contrast, TCP/IP requires every client and network to
have a unique assigned address, with both a network component and a system address.)
Microsoft Windows Server 2003 accommodates TCP/IP and IPX, individually or concurrently.
What you configure depends on your particular network configuration.
Routing protocol metrics
All IP addresses, subnet masks, and metrics are stored in a routing table so that packets of
information can be directed quickly to their destinations. If a client on a subnet sends a packet
to another on the same subnet—x.x.3.3 to x.x.3.8, for example—the packet goes directly to its
recipient. If a client on one subnet sends a packet to a client on a different subnet—x.x.3.3 to
x.x.4.9, for example—the packet is sent through a router, and is routed along the shortest path
from one point to another, based on routing protocol metrics.
Routing protocol metrics measure the cost of sending a packet between a source and a
destination. By setting routing protocol metrics, you can define pathways and alternate
pathways for routing packets.
Hint: The IP Routing Table in the RRAS administrator reports non-local metrics as one greater
than they really are.
The RIP metric, for example, is measured in hop counts (the number of nodes, composed of
routers and other devices).
If both a modem and a digital line connect to the ISP, configure RIP metrics so that the digital
line will be used for all routing to the ISP. You can control the metric by defining a default static
route and setting a shorter metric for the digital (1) than for the modem (2).
The OSPF metrics take bandwidth and load sharing (distributing bandwidth across equal paths)
into account, making them both more advanced and more complex to configure than RIP
metrics.
Note: Backup routing requires special configuration, since RRAS cannot detect link failures.
The digital link must have RIP or OSPF configured, and the modem link must have a default or
static route configured.
Release 2.0
September 2010