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Table Of Contents

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Figure 22-4 URPF application situation

In the above figure, Router A sends requests to the server Router B by faking messages whose source

address are 2.2.2.1/8 .In response, Router B will send the messages to the real ”2.2.2.1/8”. Such illegal

messages attack both Router B and Router C. The application of URPF technology in the situation described

above can avoid the attacks based on the Source Address Spoofing.

22.4.2 URPF Configuration Task Sequence

1. Enable URPF

2. Display and debug URPF relevant information

1. Globally enable URPF

Command

Explanation

Global mode

urpf enable

no urpf enable

Globally enable and disable URPF.

2. Display and debug URPF relevant information

Command

Explanation

Admin and Config Mode

show urpf

Display which interfaces have been

enabled with URPF function.

22.4.3 URPF Typical Example

SW1

SW2

SW3

Globally enable

URPF

E1/0/8

10.1.1.10/24

vlan1

E1/0/2

Vlan3

E3/2

Vlan4

E1/0/3