--> Dynamic ARP Inspection is used to prevent ARP Spoofing and Man in the Middle attacks in the Network.
--> ARP Spoofing attack occurs because of ARP behaviour.
--> ARP accepts ARP reply without sending any ARP Request for particular IP address and updates ARP Table for that IP address. This is called as Gratuitous ARP.
--> DAI Security feature checks ARP packets in the network.
--> In DAI , Switch Ports are divided into two types
i) Trusted Ports ( Where no ARP inspection or check takes place)
ii) UnTrusted Ports ( Where ARP Inspection takes place)
--> Basically we will configure Switchports which are connected to Host are configured as untrusted ports and Switchports which are connected to other switches as Trusted Ports.
--> DAI uses DHCP snooping binding table.
--> If you configure ip address manually on the host, then the communication won't happen with other devices, In that case we have to configure ARP Acl manually which allows the communication with other devices.
Configuration
Switch (config)# ip arp inspection vlan 10
Switch(config)# int gig0/1
Switch (config)# ip arp inspection trust
---> Gig0/1 is the port where switch or router is connected..
--> ARP Spoofing attack occurs because of ARP behaviour.
--> ARP accepts ARP reply without sending any ARP Request for particular IP address and updates ARP Table for that IP address. This is called as Gratuitous ARP.
--> DAI Security feature checks ARP packets in the network.
--> In DAI , Switch Ports are divided into two types
i) Trusted Ports ( Where no ARP inspection or check takes place)
ii) UnTrusted Ports ( Where ARP Inspection takes place)
--> Basically we will configure Switchports which are connected to Host are configured as untrusted ports and Switchports which are connected to other switches as Trusted Ports.
--> DAI uses DHCP snooping binding table.
--> If you configure ip address manually on the host, then the communication won't happen with other devices, In that case we have to configure ARP Acl manually which allows the communication with other devices.
Configuration
Switch (config)# ip arp inspection vlan 10
Switch(config)# int gig0/1
Switch (config)# ip arp inspection trust
---> Gig0/1 is the port where switch or router is connected..
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