Some operating systems, such as Linux, will reply to ARP requests for the cluster IP address configured on the loopback interface. On such systems, the ARP behavior needs to be adjusted so the system only replies to ARP requests for IP addresses on non-loopback interfaces. The method used to do this varies between operating systems. For example, to do this on a Linux box, you would adjust specific kernel parameter values as shown below, by editing the file /etc/sysctl:
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net.ipv4.conf.all.arp_ignore = 1 net.ipv4.conf.all.arp_announce = 2 net.ipv4.conf.default.arp_ignore = 1 net.ipv4.conf.default.arp_announce = 2 net.ipv4.conf.eth0.arp_ignore = 1 net.ipv4.conf.eth0.arp_announce = 2 |