How To Use DHCP Snooping and ARP Security to Block ARP Poisoning Attacks

PublishTime：2022-03-23

When you use DHCP servers to allocate IP addresses to clients on a LAN, you can also configure DHCP snooping to bolster the security on the LAN. DHCP snooping only allows clients to access the network if they have specific IP and/orMAC addresses.
With DHCP snooping, you can control access by:
●allowing only known IP addresses on the LAN
●allowing only a specific number of clients to access the LAN on any given port
●providing a record of where on the network any given IP address was in use at any given time
Through a sub-feature known as ARP security, DHCP snooping can also impose very strict control over what ARP packets are allowed into the network. This How To Note concentrates on this ARP security aspect of DHCP snooping, and shows how you can use it to guard against certain information-stealing attacks.

Brand of Product：	Allied Telesis
Part#：	x900 Series 、 x900 、 AT-9900 series 、 AT-8948 series 、 x900-48 series 、 AT-8800 series 、 AT-8600 series 、 AT-8700XL series 、 AT-9900 、 AT-8948 、 x900-48 、 AT-8800 、 AT-8600 、 AT-8700XL More Part#
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Operating Temperature：	Please see the document for details
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Language：	English Chinese Chinese and English Japanese
Date of Creation：	2007/9/12
Version Number：	REV A
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