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August 16, 2024 09:18
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99-custom-sysctl.conf
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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 | |
| # | |
| ################################################################### | |
| # Magic system request Key | |
| # 0=disable, 1=enable all | |
| # Debian kernels have this set to 0 (disable the key) | |
| # See https://www.kernel.org/doc/Documentation/sysrq.txt | |
| # for what other values do | |
| #kernel.sysrq=1 | |
| ################################################################### | |
| # Protected links | |
| # | |
| # Protects against creating or following links under certain conditions | |
| # Debian kernels have both set to 1 (restricted) | |
| # See https://www.kernel.org/doc/Documentation/sysctl/fs.txt | |
| #fs.protected_hardlinks=0 | |
| #fs.protected_symlinks=0 | |
| ################################################################### | |
| # Custom settings | |
| # | |
| net.ipv4.ip_forward=1 | |
| net.ipv4.tcp_syncookies=1 | |
| net.ipv4.conf.all.rp_filter=1 | |
| net.ipv6.conf.default.forwarding=1 | |
| net.ipv6.conf.all.forwarding=1 | |
| net.ipv6.conf.all.accept_source_route = 1 | |
| net.ipv4.conf.all.accept_source_route = 1 | |
| net.ipv4.conf.all.accept_redirects = 1 | |
| net.ipv6.conf.all.accept_redirects = 1 | |
| net.ipv4.conf.all.secure_redirects = 1 | |
| net.ipv4.conf.all.send_redirects = 0 | |
| #net.ipv4.conf.all.log_martians = 1 | |
| fs.inotify.max_user_watches=165536 | |
| vm.swappiness=60 | |
| vm.vfs_cache_pressure=50 | |
| vm.overcommit_memory=1 | |
| # Docker ROOTLESS | |
| kernel.unprivileged_userns_clone = 1 | |
| net.ipv4.ip_unprivileged_port_start = 0 |
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