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Use the default route as the route to the Internet

2022-07-04 14:01:00 【51CTO】

This case is an application scenario of default routing .

The intranet of a company has A、B、C and D common 4 Router , Yes 10.1.0.0/24、10.2.0.0/24、10.3.0.0/24、10.4.0.0/24、10.5.0.0/24、10.6.0.0/24 common 6 Net segment , The network topology and address planning are shown in the figure 1 Shown . Now ask here 4 Add routes to routers , Make the intranet share 6 Network segments can communicate with each other , At the same time it 6 Each network segment should also be accessible Internet.

Router B and D It is the end router of the network , Connect two network segments directly , To other networks, you need to forward to the router C, In these two routers, you only need to add a default route .

For routers C Come on , Direct connection 3 Net segment , To 10.1.0.0/24、10.4.0.0/24 The routes of the two network segments need to be added separately , To Internet or 10.6.0.0/24 Packet of network segment , All need to be forwarded to the router A, Add another default route .

For routers A Come on , Direct connection 3 Net segment , For several intranet without direct connection , You need to add a route separately , To Internet You only need to add a default route to access .

To Internet Routing of all network segments on the , Just add a default route .

Use the default route as the point Internet The routing _ Intranet

chart 1 Use the default route to simplify the routing table

Observation map 2, have a look A Can the routing table in the router be further simplified . The network segments used in the enterprise intranet can be merged into 10.0.0.0/8 In segment , So in the router A in , Routes to intranet segments can be aggregated into one , Pictured 5-13 Shown . Think about the router C Can the routing table in be simplified ？

Use the default route as the point Internet The routing _ Intranet _02