Network Related Kernel Runtime Parameters for Hosts and Routers

$ sudo sysctl -w net.ipv4.conf.all.accept_local=0

net.ipv4.conf.all.accept_local = 0

$ sudo sysctl -w net.ipv4.conf.all.arp_filter=

net.ipv4.conf.all.arp_filter = 

$ sudo sysctl -w net.ipv4.conf.all.arp_ignore=

net.ipv4.conf.all.arp_ignore = 

$ sudo sysctl -w net.ipv4.conf.all.route_localnet=0

net.ipv4.conf.all.route_localnet = 0

$ sudo sysctl -w net.ipv4.conf.all.rp_filter=1

net.ipv4.conf.all.rp_filter = 1

$ sudo sysctl -w net.ipv4.conf.all.secure_redirects=0

net.ipv4.conf.all.secure_redirects = 0

$ sudo sysctl -w net.ipv4.conf.all.shared_media=

net.ipv4.conf.all.shared_media = 

$ sudo sysctl -w net.ipv4.conf.default.accept_redirects=0

net.ipv4.conf.default.accept_redirects = 0

$ sudo sysctl -w net.ipv4.conf.default.shared_media=

net.ipv4.conf.default.shared_media = 

$ sudo sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1

net.ipv4.icmp_echo_ignore_broadcasts = 1

$ sudo sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1

net.ipv4.icmp_ignore_bogus_error_responses = 1

$ sudo sysctl -w net.ipv4.tcp_syncookies=1

net.ipv4.tcp_syncookies = 1