Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 52)

46 Chapter 2 - IP Routing & Bridging

When you are finished adding entries, making changes, and marking dele-

tions, click OK to store them in CompatiView’s edit area for the device, for

later downloading. If you click Cancel, CompatiView will discard any

changes and additions you made in this dialog box.

v Note: The “default router” is used as a “route of last resort” when your

device cannot determine where an IP packet should be sent. In very simple

routing setups, including connecting small networks to the Internet through

an Internet Service Provider, a default router entry may be the only routing

information required.

Static routes are used to provide information to the device about where IP

packets should be sent when the device itself has not been able to determine

a correct route for them using dynamic routing information acquired through

an IP routing protocol such as RIP.

In cases where the routing metrics (i.e. the number of routing hops to a desti-

nation) are equal between a static route and a dynamic route, Compatible

Systems devices will use the dynamic route.

v Note: Static routes are more difficult to maintain and are generally not as

reliable as dynamically determined routes. We recommend that you use static

routing only when the network does not provide adequate routing information

through RIP.

> Destination

Enter an IP address here in decimal notation for which you wish to provide

static routing information. This can be a network address or an entire host

address (e.g. 198.238.9).

By convention, 0.0.0.0 is used here for a default router entry.

> Mask

Enter a mask value here to tell the device how much of the Destination

Address entry should be considered when determining the route for a packet.

If you simply tab into this field, CompatiView will calculate a standard mask

depending on the class of the Destination Address network. For instance,

255.255.255.0 tells the device to consider only the first three octets of a

packet’s address in determining whether it should be routed to the Gateway.

By convention, 0.0.0.0 is used here for a default router entry.

> Gateway

This section allows you to specify a gateway machine which is responsible

for packets being sent to the Destination Address.

• If IP Address is selected, enter the IP address of the gateway.

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Compatible-systems 5.4 Manuel d'utilisateur Page 52