I have two hubshub1 was connected to four pcpc1-192.168.10.11pc2-192.168.10.12pc3-192.168.10.13pc4-192.168.10.14hb2 was connected to four pcpc5-192.168.10.15pc6-192.168.10.16pc7-192.168.10.17pc8-192.168.10.18 i want pC1 should ping pc5pc1 should not ...