Network Parameters for Hosts Only System
If the system is not going to be used as a firewall or gateway to pass IP traffic between different networks, then edit the file /etc/sysctl.conf and add or correct the following lines:
net.ipv4.ip forward = 0
net.ipv4.conf.all.send redirects = 0
net.ipv4.conf.default.send redirects = 0
net.ipv4.conf.all.send redirects = 0
net.ipv4.conf.default.send redirects = 0
These settings disable hosts from performing network functionality which is only appropriate for routers.
