sysctl.conf (High performance config)

Credit: Dom Charoenyos, https://pastebin.com/h5iEuiPz

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
#

#kernel.domainname = example.com

# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3

##############################################################3
# Functions previously found in netbase
#

# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1

# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1

# Uncomment the next line to enable packet forwarding for IPv4
net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1


###################################################################
# Additional settings - these settings can improve the network
# security of the host and prevent against some network attacks
# including spoofing attacks and man in the middle attacks through
# redirection. Some network environments, however, require that these
# settings are disabled so review and enable them as needed.
#
# Do not accept ICMP redirects (prevent MITM attacks)
#net.ipv4.conf.all.accept_redirects = 0
#net.ipv6.conf.all.accept_redirects = 0
# _or_
# Accept ICMP redirects only for gateways listed in our default
# gateway list (enabled by default)
# net.ipv4.conf.all.secure_redirects = 1
#
# Do not send ICMP redirects (we are not a router)
#net.ipv4.conf.all.send_redirects = 0
#
# Do not accept IP source route packets (we are not a router)
#net.ipv4.conf.all.accept_source_route = 0
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#
#net.ipv4.tcp_fin_timeout = 60
#net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_syn_retries = 5

kernel.sem = 250 32000 100 128
kernel.shmall = 209715200
kernel.shmmax = 214748364800
kernel.shmmni = 4096
fs.file-max = 1000000
vm.swappiness = 0
vm.vfs_cache_pressure = 50

net.ipv4.tcp_fin_timeout = 3
net.core.netdev_max_backlog = 30000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_max_syn_backlog = 8192
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.core.somaxconn = 8192
vm.min_free_kbytes = 65536

#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_no_metrics_save = 1
#net.ipv4.tcp_syncookies = 1
#net.ipv4.tcp_max_syn_backlog = 2048
#net.ipv4.tcp_synack_retries = 2
#net.ipv4.tcp_syncookies

net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_mem = 786432 1048576 1572864
kernel.pid_max = 65536
net.ipv6.conf.all.disable_ipv6=1
net.ipv4.tcp_syncookies = 0

net.bridge.bridge-nf-call-iptables = 0
net.ipv4.ip_local_port_range = 2000 65000
net.ipv4.tcp_window_scaling = 1
# number of packets to keep in backlog before the kernel starts dropping them
net.ipv4.tcp_max_syn_backlog = 8240000
      # increase socket listen backlog
#net.core.somaxconn = 824000
net.ipv4.tcp_max_tw_buckets = 1440000
        # Increase TCP buffer sizes
net.core.rmem_default = 8388608
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_congestion_control = cubic
net.bridge.bridge-nf-call-iptables = 0
kernel.perf_event_max_sample_rate = 25000
net.netfilter.nf_conntrack_max = 556000
net.ipv4.tcp_congestion_control=htcp
net.ipv4.netfilter.ip_conntrack_max = 409600

kernel.printk_ratelimit = 30

kernel.printk_ratelimit_burst = 500

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