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vim /etc/sysctl.conf

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sysctl -p

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net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

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net.ipv4.icmp_echo_ignore_broadcasts = 1

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net.ipv4.icmp_ignore_bogus_error_responses = 1

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net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

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

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net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0

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kernel.sysrq = 0

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kernel.core_uses_pid = 1

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net.ipv4.tcp_syncookies = 1

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kernel.msgmnb = 65536
kernel.msgmax = 65536

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kernel.shmmax = 68719476736
kernel.shmall = 4294967296

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net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

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net.core.netdev_max_backlog = 262144

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net.ipv4.tcp_max_orphans = 3276800

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net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0

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net.ipv4.tcp_synack_retries = 1

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net.ipv4.tcp_syn_retries = 1

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net.ipv4.tcp_tw_recycle = 1

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net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1

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net.ipv4.tcp_keepalive_time = 30

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net.ipv4.ip_local_port_range = 1024 65000

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net.netfilter.nf_conntrack_max = 655350
net.netfilter.nf_conntrack_tcp_timeout_established = 1200