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##############################################################################
# /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
###############################################################################
# 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
# Ignore ICMP broadcast requests
net.ipv4.icmp_echo_ignore_broadcasts = 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
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.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
# Ignore send redirects
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.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
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0
# Ignore Directed pings
net.ipv4.icmp_echo_ignore_all = 1
# Log Martians
net.ipv4.conf.all.log_martians = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
#######################################################################
# Magic system request Key
# 0=disable, 1=enable all
# Debian kernels have this set to 0 (disable the key)
# See
https://www.kernel.org/doc/Documentation/sysrq.txt
# for what other values do
#kernel.sysrq = 1
#######################################################################
### Protected links ###
# Protects against creating or following links under certain conditions
# Debian kernels have both set to 1 (restricted)
# See
https://www.kernel.org/doc/Documentation/sysctl/fs.txt
#fs.protected_hardlinks = 0
#fs.protected_symlinks = 0
#######################################################################
# Disable ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
#######################################################################
### IMPROVE SYSTEM MEMORY MANAGEMENT ###
# Increase size of file handles and inode cache
fs.file-max = 2097152
### Do less swapping ###
vm.dirty_ratio = 80 # from 40
vm.dirty_background_ratio = 5 # from 10
vm.dirty_expire_centisecs = 12000 # from 3000
vm.dirty_writeback_centisecs = 1500
vm.swappiness = 0
vm.vfs_cache_pressure = 50
### TUNING NETWORK PERFORMANCE ###
net.core.somaxconn = 1024
net.ipv4.tcp_slow_start_after_idle = 0
# Increase the maximum total buffer-space allocatable
# This is measured in units of pages (4096 bytes)
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144
# Default Socket Receive Buffer
net.core.rmem_default = 25165824
# Maximum Socket Receive Buffer
net.core.rmem_max = 25165824
# Increase the read-buffer space allocatable (minimum size,
# initial size, and maximum size in bytes)
net.ipv4.tcp_rmem = 20480 12582912 25165824
net.ipv4.udp_rmem_min = 16384
# Default Socket Send Buffer
net.core.wmem_default = 25165824
# Maximum Socket Send Buffer
net.core.wmem_max = 25165824
# Increase the write-buffer-space allocatable
net.ipv4.tcp_wmem = 20480 12582912 25165824
net.ipv4.udp_wmem_min = 16384
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_window_scaling = 1
# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_tw_reuse = 1
# tells the kernel how many TCP sockets that are not attached to any
# user file handle to maintain. In case this number is exceeded,
# orphaned connections are immediately reset and a warning is printed.
net.ipv4.tcp_max_orphans = 60000
# Maximum number of remembered connection requests, which did not yet
# receive an acknowledgment from connecting client.
net.ipv4.tcp_max_syn_backlog = 10240
# Protect against TCP Time-Wait
net.ipv4.tcp_rfc1337 = 1
# Decrease the time default value for tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 15
# Number of times SYNACKs for passive TCP connection.
net.ipv4.tcp_synack_retries = 2
# Decrease the time default value for connections to keep alive
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
# recommended default congestion control is htcp
net.ipv4.tcp_congestion_control=htcp
# Increase number of incoming connections backlog queue
# Sets the maximum number of packets, queued on the INPUT
# side, when the interface receives packets faster than
# kernel can process them.
net.core.netdev_max_backlog = 65536
Terminal: sudo su
echo 25165824 > /proc/sys/net/core/rmem_default
echo 25165824 > /proc/sys/net/core/rmem_max
echo 25165824 > /proc/sys/net/core/wmem_default
echo 25165824 > /proc/sys/net/core/wmem_max