syn flood

# Disable ICMP
net.ipv4.icmp_echo_ignore_all = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1


# TCP SYN Flood Protection
net.ipv4.tcp_syncookies = 1
net.core.somaxconn = 1024
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 3
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_fin_timeout = 15

# Increase conntrack
net.netfilter.nf_conntrack_max=524285


fs.file-max=209708
net.core.rmem_default=201250
net.core.wmem_default=201250
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 10000
net.core.somaxconn=32768
net.ipv4.tcp_mem= 786432 1048576 996777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 1800
net.ipv4.tcp_keepalive_intvl=5
net.ipv4.tcp_keepalive_probes=3
net.ipv4.tcp_synack_retries = 3
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_mtu_probing=1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack=0
net.ipv4.tcp_max_syn_backlog=4096
net.ipv4.tcp_max_tw_buckets = 720000
net.ipv4.tcp_max_orphans = 65536
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.conf.all.send_redirects=0
net.ipv4.conf.all.accept_redirects=0
net.ipv4.conf.default.accept_redirects=0
net.ipv4.conf.all.secure_redirects=0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.rp_filter=1
net.ipv4.conf.default.rp_filter=1
net.ipv4.ip_local_port_range=1024 65000
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.netfilter.ip_conntrack_max = 16777216
net.netfilter.nf_conntrack_max = 16777216
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296