cat  <<EOF>> /etc/sysctl.conf
vm.swappiness = 0
kernel.sysrq = 1
net.ipv4.neigh.default.gc_stale_time = 120

net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2

fs.file-max = 65535
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_keepalive_time = 30
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 15

net.ipv4.ip_local_port_range = 1024 65535
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 30000000 30000000 30000000
net.ipv4.tcp_wmem = 30000000 30000000 30000000
net.ipv4.tcp_fin_timeout = 10 
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_window_scaling = 0 
net.ipv4.tcp_sack = 0 
net.core.netdev_max_backlog = 30000
net.ipv4.tcp_no_metrics_save=1 
net.core.somaxconn = 65535
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_orphans = 262144 
net.ipv4.tcp_max_syn_backlog = 262144 
net.ipv4.tcp_synack_retries = 2 
net.ipv4.tcp_syn_retries = 2
EOF

sysctl -p
sysctl -w net.ipv4.route.flush=1