i am running a small network network of 230 computers. These computers are connected to the D-Link 24 port switches (non-manageable). These switches are not connected one another directly but all are connected to a catalyst 3750 (manageable switch). This catalyst 3750 is directly connected to pixfirewall 515.
Some of computers in the networking are not ping the pixfirewall 515. one computer is directly connected to catalyst 3750 and that system also stops ping to the pixfirewall 515. when the LAN cable is disconnected from the computer means unplugged and replugged then ping starts to the pixfirewall 515.
Now i m using arp -d command on infected system and ping starts. but this is not solution.
Is there anybody who can help me on this problem.