sysctl.conf

net.ipv4.conf.all.rp_filter=1
net.ipv4.icmp_echo_ignore_broadcasts=1

kernel.shmmax = 1500000000

net.ipv4.ip_local_port_range = 1024 65535
vm.overcommit_memory = 1
fs.file-max = 1000000

# General gigabit tuning:
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_syncookies = 1

# more mem for lots of tcp connections
net.ipv4.tcp_mem = 50576   64768   98152
net.core.netdev_max_backlog = 2500