134 lines
4.0 KiB
Plaintext
134 lines
4.0 KiB
Plaintext
#
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# /etc/sysctl.conf - Configuration file for setting system variables
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# See /etc/sysctl.d/ for additional system variables.
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# See sysctl.conf (5) for information.
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#
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#kernel.domainname = example.com
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# Uncomment the following to stop low-level messages on console
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kernel.printk = 3 4 1 3
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##############################################################3
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# Functions previously found in netbase
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#
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# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
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# Turn on Source Address Verification in all interfaces to
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# prevent some spoofing attacks
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#net.ipv4.conf.default.rp_filter=1
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#net.ipv4.conf.all.rp_filter=1
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# Uncomment the next line to enable TCP/IP SYN cookies
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# See http://lwn.net/Articles/277146/
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# Note: This may impact IPv6 TCP sessions too
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#net.ipv4.tcp_syncookies=1
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# Uncomment the next line to enable packet forwarding for IPv4
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net.ipv4.ip_forward=1
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# Uncomment the next line to enable packet forwarding for IPv6
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# Enabling this option disables Stateless Address Autoconfiguration
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# based on Router Advertisements for this host
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net.ipv6.conf.all.forwarding=1
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###################################################################
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# Additional settings - these settings can improve the network
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# security of the host and prevent against some network attacks
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# including spoofing attacks and man in the middle attacks through
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# redirection. Some network environments, however, require that these
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# settings are disabled so review and enable them as needed.
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#
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# Do not accept ICMP redirects (prevent MITM attacks)
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#net.ipv4.conf.all.accept_redirects = 0
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#net.ipv6.conf.all.accept_redirects = 0
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# _or_
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# Accept ICMP redirects only for gateways listed in our default
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# gateway list (enabled by default)
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# net.ipv4.conf.all.secure_redirects = 1
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#
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# Do not send ICMP redirects (we are not a router)
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#net.ipv4.conf.all.send_redirects = 0
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#
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# Do not accept IP source route packets (we are not a router)
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#net.ipv4.conf.all.accept_source_route = 0
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#net.ipv6.conf.all.accept_source_route = 0
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#
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# Log Martian Packets
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#net.ipv4.conf.all.log_martians = 1
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#
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###################################################################
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# Magic system request Key
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# 0=disable, 1=enable all, >1 bitmask of sysrq functions
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# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
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# for what other values do
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#kernel.sysrq=438
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vm.swappiness=1
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vm.dirty_ratio=50
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vm.dirty_background_ratio=30
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vm.min_free_kbytes = 4096
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vm.vfs_cache_pressure=75
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### GENERAL NETWORK SECURITY OPTIONS ###
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# Number of times SYNACKs for passive TCP connection.
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net.ipv4.tcp_synack_retries = 2
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# Protect Against TCP Time-Wait
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net.ipv4.tcp_rfc1337 = 1
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# Decrease the time default value for tcp_fin_timeout connection
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net.ipv4.tcp_fin_timeout = 15
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# Decrease the time default value for connections to keep alive
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net.ipv4.tcp_keepalive_time = 300
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net.ipv4.tcp_keepalive_probes = 5
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net.ipv4.tcp_keepalive_intvl = 15
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### TUNING NETWORK PERFORMANCE ###
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# Default Socket Receive Buffer
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net.core.rmem_default = 31457280
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# Maximum Socket Receive Buffer
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net.core.rmem_max = 12582912
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# Default Socket Send Buffer
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net.core.wmem_default = 31457280
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# Maximum Socket Send Buffer
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net.core.wmem_max = 12582912
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# Increase number of incoming connections
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net.core.somaxconn = 4096
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# Increase number of incoming connections backlog
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net.core.netdev_max_backlog = 65536
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# Increase the maximum amount of option memory buffers
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net.core.optmem_max = 25165824
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# Increase the maximum total buffer-space allocatable
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# This is measured in units of pages (4096 bytes)
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net.ipv4.tcp_mem = 65536 131072 262144
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net.ipv4.udp_mem = 65536 131072 262144
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# Increase the read-buffer space allocatable
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net.ipv4.tcp_rmem = 8192 87380 16777216
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net.ipv4.udp_rmem_min = 16384
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# Increase the write-buffer-space allocatable
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net.ipv4.tcp_wmem = 8192 65536 16777216
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net.ipv4.udp_wmem_min = 16384
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# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
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net.ipv4.tcp_max_tw_buckets = 1440000
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net.ipv4.tcp_tw_reuse = 1
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# Congestion Control
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net.core.default_qdisc=fq
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net.ipv4.tcp_congestion_control=bbr
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