Offline PCS to ping each VLAN gateway, also can ping other PCS, under the same VLAN can't PC under other VLAN (all VLAN when the normal PC can ping); Also can't master router. Can eliminate offline PC system problem, because this happens, is not to say only one computer, one PC today may be the financial staff appear offline, a few days is likely to be the same problem on the sales department of a PC, it feels like the ARP virus, please master door to help analysis analysis, where is the problem? Thank you very much!

Note: due to the early stage of the company network planning is not in place, and the company is not installed wireless AP, just installed several wireless router and small switches, each wireless router has open DHCP, but also with the main IP address of each wireless router router and each VLAN gateway address is not a network segment, each VLAN has open DHCP, and most of the PC machine is automatically obtain IP address, no broken network, can PING each other between each VLAN, PC under different VLAN can PING each other,