| 1 | # |
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| 2 | # /etc/sysctl.conf - Configuration file for setting system variables |
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| 3 | # See /etc/sysctl.d/ for additonal system variables |
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| 4 | # See sysctl.conf (5) for information. |
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| 5 | # |
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| 6 | |
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| 7 | #kernel.domainname = example.com |
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| 8 | |
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| 9 | # Uncomment the following to stop low-level messages on console |
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| 10 | #kernel.printk = 4 4 1 7 |
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| 11 | |
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| 12 | ##############################################################3 |
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| 13 | # Functions previously found in netbase |
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| 14 | # |
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| 15 | |
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| 16 | # Uncomment the next two lines to enable Spoof protection (reverse-path filter) |
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| 17 | # Turn on Source Address Verification in all interfaces to |
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| 18 | # prevent some spoofing attacks |
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| 19 | #net.ipv4.conf.default.rp_filter=1 |
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| 20 | #net.ipv4.conf.all.rp_filter=1 |
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| 21 | |
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| 22 | # Uncomment the next line to enable TCP/IP SYN cookies |
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| 23 | # This disables TCP Window Scaling (http://lkml.org/lkml/2008/2/5/167), |
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| 24 | # and is not recommended. |
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| 25 | #net.ipv4.tcp_syncookies=1 |
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| 26 | |
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| 27 | # Uncomment the next line to enable packet forwarding for IPv4 |
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| 28 | net.ipv4.ip_forward=1 |
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| 29 | |
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| 30 | # Uncomment the next line to enable packet forwarding for IPv6 |
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| 31 | #net.ipv6.conf.all.forwarding=1 |
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| 32 | |
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| 33 | |
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| 34 | ################################################################### |
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| 35 | # Additional settings - these settings can improve the network |
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| 36 | # security of the host and prevent against some network attacks |
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| 37 | # including spoofing attacks and man in the middle attacks through |
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| 38 | # redirection. Some network environments, however, require that these |
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| 39 | # settings are disabled so review and enable them as needed. |
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| 40 | # |
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| 41 | # Ignore ICMP broadcasts |
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| 42 | #net.ipv4.icmp_echo_ignore_broadcasts = 1 |
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| 43 | # |
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| 44 | # Ignore bogus ICMP errors |
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| 45 | #net.ipv4.icmp_ignore_bogus_error_responses = 1 |
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| 46 | # |
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| 47 | # Do not accept ICMP redirects (prevent MITM attacks) |
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| 48 | #net.ipv4.conf.all.accept_redirects = 0 |
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| 49 | #net.ipv6.conf.all.accept_redirects = 0 |
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| 50 | # _or_ |
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| 51 | # Accept ICMP redirects only for gateways listed in our default |
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| 52 | # gateway list (enabled by default) |
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| 53 | # net.ipv4.conf.all.secure_redirects = 1 |
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| 54 | # |
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| 55 | # Do not send ICMP redirects (we are not a router) |
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| 56 | #net.ipv4.conf.all.send_redirects = 0 |
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| 57 | # |
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| 58 | # Do not accept IP source route packets (we are not a router) |
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| 59 | #net.ipv4.conf.all.accept_source_route = 0 |
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| 60 | #net.ipv6.conf.all.accept_source_route = 0 |
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| 61 | # |
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| 62 | # Log Martian Packets |
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| 63 | #net.ipv4.conf.all.log_martians = 1 |
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| 64 | # |
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| 65 | # The contents of /proc/<pid>/maps and smaps files are only visible to |
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| 66 | # readers that are allowed to ptrace() the process |
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| 67 | # kernel.maps_protect = 1 |
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