The Eudemon 1000E-U/X is deployed in active/standby mode. FW_A is the active device. A user can ping the actual address of the Eudemon 1000E-U/X interface from a PC through a switch successfully, but fails to ping the virtual address of the interface. On the Eudemon 1000E-U/X, ping the PC while specifying the source address in the command. The actual address can be pinged successfully while the virtual address cannot be pinged.