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CLI-based Configuration Guide - Security

AR500, AR510, and AR530 V200R007

This document describes the configurations of Security, including AAA, DAA,NAC, BRAS Access, ACL, Firewall, Deep Security Defense, Local Attack Defense;Attack Defense, Traffic Suppression, ARP Security, Port Security, DHCP Snooping, IPSG, URPF, PKI, SSL, HTTPS, Keychain, separating the management plane from the service plane, security risks.
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Applications

Applications

URPF Strict Check

As shown in Figure 14-2, AS1, AS2, and AS3 are unidirectionally connected. URPF is enabled on Interface1 and Interface2 of SwitchC to protect AS3 from source address spoofing attacks from AS1 and AS2.

Assumes that PC A in AS1 generates a packet with the bogus source IP address 2.2.2.2 and sends the packet to the server in AS3. After receiving the packet, RouterC checks the inbound interface of the packet and finds that the packet with the destination IP address 2.2.2.2 must reach RouterC through Interface2. RouterC considers the packet as a bogus packet and discards it.

The packet sent from AS2 to the server is forwarded after passing URPF check.

Figure 14-2  URPF strict check application

URPF Loose Check

URPF is often used when multiples connections are set up between two network edge devices.

  • Single-homed client connected to one ISP

    Figure 14-3  URPF enabled on single-homed client connected to one ISP

    As shown in Figure 14-3, two connections are set up between the enterprise and the ISP device to ensure reliability. In this case, route symmetry between the enterprise and the ISP device cannot be ensured. Therefore, URPF loose check is used.

  • Multi-homed client connected to several ISPs

    Figure 14-4  URPF enabled on multi-homed client connected to several ISPs

    As shown in Figure 14-4, the enterprise is connected to several ISPs. Route symmetry between the enterprise and the two ISP devices cannot be ensured. Therefore, URPF loose check is used.

    URPF enabled on multi-homed client connected to several ISPs can be applied to the following situations:

    • If specified packets are required to pass the URPF check in any situations, you can create an ACL to permit packets with specified source IP addresses to pass through.

    • The devices connected to users may only have a default route to the ISP. Therefore, matching the default routing entry needs to be supported.

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Updated: 2019-05-25

Document ID: EDOC1000097287

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