#
# /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
#

########## General Network Security Options ###########
# Number of times SYNACKs for passive TCP connection.
#net.ipv4.tcp_synack_retries = 2

# Allowed local port range
#net.ipv4.ip_local_port_range = 2000 65535

# Protect Against TCP Time-Wait
#net.ipv4.tcp_rfc1337 = 1

# Control Syncookies
net.ipv4.tcp_syncookies = 1

# Decrease the time default value for tcp_fin_timeout connection
#net.ipv4.tcp_fin_timeout = 15

# 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


########## TUNING NETWORK PERFORMANCE ############

# Default Socket Receive Buffer
#net.core.rmem_default = 212992

# Maximum Socket Receive Buffer
#net.core.rmem_max = 212992

# Default Socket Send Buffer
#net.core.wmem_default = 212992

# Maximum Socket Send Buffer
#net.core.wmem_max = 212992

# Increase number of incoming connections
# net.core.somaxconn = 65535

# Increase number of incoming connections backlog
# net.core.netdev_max_backlog = 65536

# Increase the maximum amount of option memory buffers
# net.core.optmem_max = 25165824

# Increase the maximum total buffer-space allocatable
# This is measured in units of pages (4096 bytes)
#net.ipv4.tcp_mem = 46239 61653 92478
#net.ipv4.udp_mem = 46239 61653 92478

# Increase the read-buffer space allocatable
#net.ipv4.tcp_rmem = 4096 87380 6291456
#net.ipv4.udp_rmem_min = 4096

# Increase the write-buffer-space allocatable
#net.ipv4.tcp_wmem = 4096 16384 4194304
#net.ipv4.udp_wmem_min = 4096

# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
#net.ipv4.tcp_max_tw_buckets = 1440000
#net.ipv4.tcp_tw_recycle = 1
#net.ipv4.tcp_tw_reuse = 1