We have a firewall that connect different network. There is one interface that connected with our core switch. the problem is. Some PCs having ip 172.16.2.0 that connected with coreswitch cannot access network that connected via firewall and are increased every day. The interface in the firewall connected with 172.16.1.0 and 172.16.2.0.
We checked ARP in the firewall but we didn't able to see the some of the PCs that are beyond coreswitch, suprisingly; there were 4000 pcs which are not in our network and all have the same MAC address.
how can i remove these Mac /ip from the firewall? or what is the problem exactly.