TCP

#
# /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


kernel.shmall = 4294967296
kernel.shmmax = 68719476736
#net.core.somaxconn=165535

net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 1
net.ipv4.ip_local_port_range = 2000 65000
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_max_syn_backlog = 3240000
# increase socket listen backlog
net.core.somaxconn = 3240000
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.ipv4.tcp_fin_timeout = 35
net.ipv4.tcp_keepalive_time = 1800
net.ipv4.tcp_keepalive_intvl = 2
net.ipv4.tcp_keepalive_probes = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
fs.file-max = 65535

net.ipv4.tcp_slow_start_after_idle=0
net.netfilter.nf_conntrack_tcp_timeout_established=600
net.ipv4.netfilter.ip_conntrack_max=524288
fs.file-max=1000000
net.ipv4.ip_local_port_range = 1024 65535