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## Place this file in "/etc/sysctl.d/network-tuning.conf" and |
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## run "sysctl -p" to have the kernel pick the new settings up |
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# Avoid a smurf attack |
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net.ipv4.icmp_echo_ignore_broadcasts = 1 |
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# Turn on protection for bad icmp error messages |
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net.ipv4.icmp_ignore_bogus_error_responses = 1 |
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# Turn on syncookies for SYN flood attack protection |
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net.ipv4.tcp_syncookies = 1 |
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# Turn on and log spoofed, source routed, and redirect packets |
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net.ipv4.conf.all.log_martians = 1 |
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net.ipv4.conf.default.log_martians = 1 |
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# No source routed packets here |
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net.ipv4.conf.all.accept_source_route = 0 |
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net.ipv4.conf.default.accept_source_route = 0 |
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# Turn on reverse path filtering |
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net.ipv4.conf.all.rp_filter = 1 |
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net.ipv4.conf.default.rp_filter = 1 |
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# Make sure no one can alter the routing tables |
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net.ipv4.conf.all.accept_redirects = 0 |
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net.ipv4.conf.default.accept_redirects = 0 |
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net.ipv4.conf.all.secure_redirects = 0 |
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net.ipv4.conf.default.secure_redirects = 0 |
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# Don't act as a router |
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net.ipv4.ip_forward = 0 |
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net.ipv4.conf.all.send_redirects = 0 |
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net.ipv4.conf.default.send_redirects = 0 |
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# Turn on execshild |
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kernel.exec-shield = 1 |
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kernel.randomize_va_space = 1 |
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# Tuen IPv6 |
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net.ipv6.conf.default.router_solicitations = 0 |
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net.ipv6.conf.default.accept_ra_rtr_pref = 0 |
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net.ipv6.conf.default.accept_ra_pinfo = 0 |
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net.ipv6.conf.default.accept_ra_defrtr = 0 |
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net.ipv6.conf.default.autoconf = 0 |
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net.ipv6.conf.default.dad_transmits = 0 |
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net.ipv6.conf.default.max_addresses = 1 |
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# Optimization for port usefor LBs |
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# Increase system file descriptor limit |
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fs.file-max = 65535 |
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# Allow for more PIDs (to reduce rollover problems); may break some programs 32768 |
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kernel.pid_max = 65536 |
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# Increase system IP port limits |
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net.ipv4.ip_local_port_range = 2000 65000 |
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# Increase TCP max buffer size setable using setsockopt() |
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net.ipv4.tcp_rmem = 4096 87380 16777216 |
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net.ipv4.tcp_wmem = 4096 87380 16777216 |
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# Increase Linux auto tuning TCP buffer limits |
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# min, default, and max number of bytes to use |
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# set max to at least 4MB, or higher if you use very high BDP paths |
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# Tcp Windows etc |
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net.core.rmem_max = 16777216 |
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net.core.wmem_max = 16777216 |
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net.core.netdev_max_backlog = 5000 |
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net.ipv4.tcp_window_scaling = 1 |
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# When the server has to cycle through a high volume of TCP connections, |
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# it can build up a large number of connections in TIME_WAIT state. |
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# TIME_WAIT means a connection is closed but the allocated |
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# resources are yet to be released. Setting this directive to 1 |
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# will tell the kernel to try to recycle the allocation |
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# for a new connection when safe to do so. |
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# This is cheaper than setting up a new connection from scratch. |
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net.ipv4.tcp_tw_reuse = 1 |
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# The minimum number of seconds that must elapse before |
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# a connection in TIME_WAIT state can be recycled. |
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# Lowering this value will mean allocations will be recycled faster. |
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net.ipv4.tcp_fin_timeout = 15 |
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# Other tunings |
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net.core.somaxconn = 4096 |
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net.ipv4.tcp_max_syn_backlog = 20480 |
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net.ipv4.tcp_max_tw_buckets = 400000 |
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net.ipv4.tcp_no_metrics_save = 1 |
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net.ipv4.tcp_syn_retries = 2 |
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net.ipv4.tcp_synack_retries = 2 |
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vm.min_free_kbytes = 65536 |
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