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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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Application Scenarios for IPSG

Application Scenarios for IPSG

IPSG is used on campus networks to prevent network access from hosts using stolen IP addresses.

Figure 12-9 shows a typical campus network. For most campus networks:

  • If a campus network is small, the hosts and printers use static IP addresses.
  • If a campus network is large, the hosts obtain IP addresses through DHCP and some printers use static IP addresses.

IPSG is configured on the switches (Switch_1 and Switch_2) to which users connect.

Figure 12-9  Typical IPSG networking

Scenario 1: IPSG prevents access of the hosts who change their IP addresses

  • Hosts can only use the IP addresses allocated by the DHCP server or static IP addresses configured by the administrator to access the network. If a host changes its IP address without permission, the host cannot access the network. This prevents hosts from obtaining network rights without permission.
  • Static IP addresses configured for the printers can only be used by printers, and cannot be used by hosts to access the network.

Scenario 2: IPSG prevents access of unauthorized hosts (static IP addresses are used on the network)

  • Each host can only connect to a fixed port and cannot change the access location. The traffic rate on ports is limited.
  • Users cannot access the intranet with their own computers. This prevents intranet resource leaks.

If hosts obtain IP addresses through DHCP, NAC (such as Portal or 802.1X authentication) can be configured to prevent unauthorized host access.

Updated: 2019-09-23

Document ID: EDOC1000178177

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