End User RIPEnterprise and ISP Protective Measures

John

Jane

1

2

3

A

B

Main

ISP

John’s

ISP

X

X

X

X

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Routers that generate RIP updates for purposes of router discovery should only advertise the default route (i.e., 0.0.0.0/0), and accept no routing updates from edge networks that only should contain end systems.

The external screening router should accept no routing advertisements from the outside which refer to internal networks.