TL-ER7206: Detected ARP conflict
Hello Everyone,
Happy new year...!!!
We are facing a weird issue in our network. We are using TL-ER7206 as our Internet gateway router, it's LAN ip address is 172.21.21.21/16.
DHCP range is from 172.21.8.1 to 172.21.9.255.
We have reserved IP address from 172.21.6.1 to 172.21.6.100 for computers and laptops in our network.
Since yesterday, network went down suddenly and when we check log in the router, we found a WARNING message stating "Detected suspected ARP attack packets. Be careful! ".
We are receiving this message periodically, " [osg:78-8C-B5-7D-40-B4] detected ARP conflict and dropped 1 packets. (Packet=172.21.21.21:46-01-BB-0C-30-16, Bind-Rule=172.21.21.21:78-8C-B5-7D-40-B4) "
Router LAN IP= 172.21.21.21
Router LAN MAC= 78-8C-B5-7D-40-B4
When we tried to lookup 46-01-BB-0C-30-16 MAC address for the its vendor/OUI, it is showing UNKNOWN.
So as of now network is not stable, ping is dropped to the devices in the LAN.
Please help and guide me to trace this issue.
With regards,
Sagar Patel