TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 User Guide - Page 222
ARP Inspection, Option 82 Support, Existed Option 82 field, Circuit ID, Remote ID
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Option 82 Support: Enable/Disable the Option 82 feature. Existed Option 82 field: Select the operation for the Option 82 field of the DHCP request packets from the Host. • Keep: Indicates to keep the Option 82 field of the packets. • Replace: Indicates to replace the Option 82 field of the packets with the switch defined one. • Drop: Indicates to discard the packets including the Option 82 field. Circuit ID: Enter the sub-option Circuit ID for the customized Option 82. Remote ID: Enter the sub-option Remote ID for the customized Option 82. Option 82 Config List Displays the option 82 configuration of the ports. 13.3 ARP Inspection According to the ARP Implementation Procedure stated in 13.1.3 ARP Scanning, it can be found that ARP protocol can facilitate the Hosts in the same network segment to communicate with one another or access to external network via Gateway. However, since ARP protocol is implemented with the premise that all the Hosts and Gateways are trusted, there are high security risks during ARP Implementation Procedure in the actual complex network. Thus, the cheating attacks against ARP, such as imitating Gateway, cheating Gateway, cheating terminal Hosts and ARP Flooding Attack, frequently occur to the network, especially to the large network such as campus network and so on. The following part will simply introduce these ARP attacks. Imitating Gateway The attacker sends the MAC address of a forged Gateway to Host, and then the Host will automatically update the ARP table after receiving the ARP response packets, which causes that the Host cannot access the network normally. The ARP Attack implemented by imitating Gateway is illustrated in the following figure. Figure 13-10 ARP Attack - Imitating Gateway 212