Mettre à jour 'etc/sysctl.conf'
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virtubox
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etc/sysctl.conf
121
etc/sysctl.conf
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#
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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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# Disable IPv6 autoconf
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net.ipv6.conf.all.autoconf = 0
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net.ipv6.conf.default.autoconf = 0
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@ -109,6 +49,67 @@ vm.swappiness = 10
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vm.dirty_ratio = 30
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vm.dirty_background_ratio = 2
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# For servers with tcp-heavy workloads, enable 'fq' queue management scheduler (kernel > 3.12)
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net.core.default_qdisc = fq
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# Turn on the tcp_window_scaling
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net.ipv4.tcp_window_scaling = 1
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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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net.core.rmem_default = 262144
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net.core.rmem_max = 16777216
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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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net.core.wmem_default = 262144
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net.core.wmem_max = 16777216
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# Increase number of incoming connections
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net.core.somaxconn = 32768
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# Increase number of incoming connections backlog
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net.core.netdev_max_backlog = 16384
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net.core.dev_weight = 64
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# Increase the maximum amount of option memory buffers
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net.core.optmem_max = 65535
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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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# try to reuse time-wait connections, but don't recycle them (recycle can break clients behind NAT)
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net.ipv4.tcp_tw_recycle = 0
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net.ipv4.tcp_tw_reuse = 1
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# Limit number of orphans, each orphan can eat up to 16M (max wmem) of unswappable memory
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net.ipv4.tcp_max_orphans = 16384
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net.ipv4.tcp_orphan_retries = 0
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# Increase the maximum memory used to reassemble IP fragments
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net.ipv4.ipfrag_high_thresh = 512000
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net.ipv4.ipfrag_low_thresh = 446464
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# don't cache ssthresh from previous connection
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net.ipv4.tcp_no_metrics_save = 1
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net.ipv4.tcp_moderate_rcvbuf = 1
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# Increase size of RPC datagram queue length
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net.unix.max_dgram_qlen = 50
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# Don't allow the arp table to become bigger than this
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net.ipv4.neigh.default.gc_thresh3 = 2048
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# Increase TCP queue length
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net.ipv4.neigh.default.proxy_qlen = 96
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net.ipv4.neigh.default.unres_qlen = 6
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# Enable Explicit Congestion Notification (RFC 3168), disable it if it doesn't work for you
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net.ipv4.tcp_ecn = 1
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net.ipv4.tcp_reordering = 3
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#Prevent SYN attack, enable SYNcookies (they will kick-in when the max_syn_backlog reached)
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net.ipv4.tcp_syncookies = 1
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net.ipv4.tcp_syn_retries = 2
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