After thinking, arp problem is suspected, then verified,
Using a virtual machine installed xp and Linux two systems respectively, xp is set to address 192.168.0.1, Linux is set to 192.168.0.100, within xp computer installed wireshark software at the same time,
The first step is to use xp computer ping test Linux computer, normal, using arp - a command to see the xp computer cache table, showing the other computer IP and physical address correspondence tables,
The second step, using the ifconfig eth0 down
The ifconfig eth0 hw Mr New physical address
The ifconfig eth0 up
Modify the Linux host physical address,
The third step, using xp host ping test Linux host, is unable to ping,
Using wireshark software to check the data packets, found that the objective physical address is still the old address,
