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Additional protection of potential man in the middle attack
Dynamic ARP Inspection will help us prevent Address Resolution Protocol – ARP spoofing attacks with help of DHCP functionality and specially DHCP snooping. This is why Dynamic ARP Inspection is usually used simultaneously with DCHP snooping. Let’s se how is this technology protecting us from ARP attack.
The DHCP snooping builds a DHCP binding table in which are the MAC addresses associated with IP addresses of network devices. We can also add to this table static MAC address to IP address mappings. This will be the best thing to do when we are mapping the interfaces of the router. DHCP binding table is used by the Dynamic ARP Inspection – DAI.
ARP – What is ARP?
Purpose of ARP requests in network is to give to the device appropriate mapping of MAC address to IP address. In other words, when a network device needs to find out the MAC address that corresponds to an IP address, the device can send an ARP request. In that moment the device that has an address that we seek replies to the requesting device with an ARP reply. The ARP reply contains the requested MAC address.
Prevent ARP Spoofing using Dynamic ARP Inspection – DAI
Networks can be protected from ARP spoofing attacks using the DAI – Dynamic ARP Inspection. Dynamic ARP Inspection functionality is similar to DHCP snooping. It uses trusted and untrusted ports. ARP replies are allowed into the switch interface only on trusted ports. If an ARP reply comes to the switch on an untrusted port, the contents of the ARP reply packet will be compared to the DHCP binding table to verify its accuracy. If the ARP reply is not valid and is not in the DHCP binding table, the ARP reply is dropped, and the port is disabled.
ON CISCO SWITCH
You can configure on the router
But bad working in load balancy and response other device
Switch1(config)# ip arp inspection vlan 60
Switch1(config)# interface gigabitethernet 0/1
Switch1(config-if)# ip arp inspection trust
Additional protection of potential man in the middle attack
Dynamic ARP Inspection will help us prevent Address Resolution Protocol – ARP spoofing attacks with help of DHCP functionality and specially DHCP snooping. This is why Dynamic ARP Inspection is usually used simultaneously with DCHP snooping. Let’s se how is this technology protecting us from ARP attack.
The DHCP snooping builds a DHCP binding table in which are the MAC addresses associated with IP addresses of network devices. We can also add to this table static MAC address to IP address mappings. This will be the best thing to do when we are mapping the interfaces of the router. DHCP binding table is used by the Dynamic ARP Inspection – DAI.
ARP – What is ARP?
Purpose of ARP requests in network is to give to the device appropriate mapping of MAC address to IP address. In other words, when a network device needs to find out the MAC address that corresponds to an IP address, the device can send an ARP request. In that moment the device that has an address that we seek replies to the requesting device with an ARP reply. The ARP reply contains the requested MAC address.
Prevent ARP Spoofing using Dynamic ARP Inspection – DAI
Networks can be protected from ARP spoofing attacks using the DAI – Dynamic ARP Inspection. Dynamic ARP Inspection functionality is similar to DHCP snooping. It uses trusted and untrusted ports. ARP replies are allowed into the switch interface only on trusted ports. If an ARP reply comes to the switch on an untrusted port, the contents of the ARP reply packet will be compared to the DHCP binding table to verify its accuracy. If the ARP reply is not valid and is not in the DHCP binding table, the ARP reply is dropped, and the port is disabled.
ON CISCO SWITCH
You can configure on the router
But bad working in load balancy and response other device
Switch1(config)# ip arp inspection vlan 60
Switch1(config)# interface gigabitethernet 0/1
Switch1(config-if)# ip arp inspection trust
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