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If there are cases of packet loss of the ping LAN IP and lf later there is connection, it is possible that the
system is attacked by ARP. To verify the situation, we may judge by checking ARP table. Enter the ARP -a
command as illustrated below.
It is found that the IP of 192.168.1.1 and 192.168.252 points to the same MAC address as
00-0f-3d-83-74-28. Evidently, this is a cheat by ARP.
3. ARP Solution
Now we understand ARP, ARP cheat and attack, as well as how to identify this type of attack. What
comes next is to find out effective prevention measures to stop the network from being attacked. The general
solution provided by Allnet can be divided into the following three options:
a) Enable “Prevent ARP Virus Attack”:
Enter the device IP address to log in the management webpage of the device. Enter ”Firewall-> General”
and find the option "Prevent ARP Virus Attack" to the right of the page. Click on the option to activate it and
click "Apply" at the bottom of the page (see illustrated).
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