概述
RAC环境，内网心跳经常不通，RAC经常宕机
解决方案
针对oracle的RAC环境，linux内核需要特别优化的参数如下：
#set new
net.ipv4.conf.eno3.rp_filter = 2
net.ipv4.conf.bond0.rp_filter = 2
net.ipv4.ipfrag_high_thresh = 67108864
net.ipv4.ipfrag_low_thresh = 66060288
net.ipv4.ipfrag_time = 120
net.ipv4.ipfrag_max_dist = 1024
net.core.netdev_budget = 600
net.core.netdev_max_backlog = 2000