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mysql+ha. 实现高可用性 http://code.google.com/p/mysql-master-master/

send_arp
 
This program sends out one ARP packet with source/target IP and Ethernet
hardware addresses suuplied by the user.  It uses the libnet libary from
Packet Factory (http://www.packetfactory.net/libnet/ ). It has been tested
on Linux, FreeBSD, and on Solaris.