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April 27, 2020 13:53
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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 | |
##############################################################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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