99 lines
3.5 KiB
Django/Jinja
99 lines
3.5 KiB
Django/Jinja
#
|
|
# /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
|
|
#
|
|
|
|
# CIS Benchmark Adjustments
|
|
# See: https://github.com/alanorth/securekickstarts
|
|
kernel.randomize_va_space = 2
|
|
net.ipv4.ip_forward = 0
|
|
net.ipv4.conf.all.send_redirects = 0
|
|
net.ipv4.conf.default.send_redirects = 0
|
|
net.ipv4.conf.all.accept_source_route = 0
|
|
net.ipv4.conf.default.accept_source_route = 0
|
|
net.ipv4.conf.all.accept_redirects = 0
|
|
net.ipv4.conf.default.accept_redirects = 0
|
|
net.ipv4.conf.all.secure_redirects = 0
|
|
net.ipv4.conf.default.secure_redirects = 0
|
|
net.ipv4.conf.all.log_martians = 1
|
|
net.ipv4.conf.default.log_martians = 1
|
|
net.ipv4.icmp_echo_ignore_broadcasts = 1
|
|
net.ipv4.icmp_ignore_bogus_error_responses = 1
|
|
net.ipv4.conf.all.rp_filter = 1
|
|
net.ipv4.conf.default.rp_filter = 1
|
|
net.ipv4.tcp_syncookies = 1
|
|
|
|
# TCP stuff
|
|
# See: http://fasterdata.es.net/host-tuning/linux/
|
|
# increase TCP max buffer size settable using setsockopt()
|
|
net.core.rmem_max = 16777216
|
|
net.core.wmem_max = 16777216
|
|
# increase Linux autotuning TCP buffer limit
|
|
net.ipv4.tcp_rmem = 4096 87380 16777216
|
|
net.ipv4.tcp_wmem = 4096 65536 16777216
|
|
# increase the length of the processor input queue
|
|
net.core.netdev_max_backlog = 30000
|
|
{# Linode kernels don't have htcp, and kernels after 2.6.32 don't have buggy cubic #}
|
|
{% if "linode" not in ansible_kernel and ansible_kernel < "2.6.33" %}
|
|
# recommended default congestion control is htcp
|
|
net.ipv4.tcp_congestion_control=htcp
|
|
{% endif %}
|
|
# recommended for hosts with jumbo frames enabled
|
|
#net.ipv4.tcp_mtu_probing=1
|