In my project, some servers used kernel parameter(net.ipv4.conf.all.rp_filter=0) for network architecture.
When I installed ElasticSearch 7.X via 'yum install elasticsearch', That kernel parameter was also changed 0 => 1. Is there reason for this to change??
Before Install
# rpm -qa | grep elasticsearch
# sysctl -a | grep net.ipv4.conf.all.rp_filter
net.ipv4.conf.all.rp_filter = 0
Install & After Install
# yum install -y elasticsearch
# rpm -qa | grep elasticsearch
elasticsearch-7.1.0-1.x86_64
# sysctl -a | grep net.ipv4.conf.all.rp_filter
net.ipv4.conf.all.rp_filter = 1