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Sysctl.conf

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May 4th, 2014
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  1. #
  2. # /etc/sysctl.conf - Configuration file for setting system variables
  3. # See /etc/sysctl.d/ for additional system variables
  4. # See sysctl.conf (5) for information.
  5. #
  6.  
  7. #kernel.domainname = example.com
  8.  
  9. # Uncomment the following to stop low-level messages on console
  10. #kernel.printk = 3 4 1 3
  11.  
  12. ##############################################################3
  13. # Functions previously found in netbase
  14. #
  15.  
  16. # Uncomment the next two lines to enable Spoof protection (reverse-path filter)
  17. # Turn on Source Address Verification in all interfaces to
  18. # prevent some spoofing attacks
  19. #net.ipv4.conf.default.rp_filter=1
  20. #net.ipv4.conf.all.rp_filter=1
  21.  
  22. # Uncomment the next line to enable TCP/IP SYN cookies
  23. # See http://lwn.net/Articles/277146/
  24. # Note: This may impact IPv6 TCP sessions too
  25. #net.ipv4.tcp_syncookies=1
  26.  
  27. # Uncomment the next line to enable packet forwarding for IPv4
  28.  
  29. net.ipv4.ip_forward=1
  30.  
  31. # Uncomment the next line to enable packet forwarding for IPv6
  32. # Enabling this option disables Stateless Address Autoconfiguration
  33. # based on Router Advertisements for this host
  34. #net.ipv6.conf.all.forwarding=1
  35.  
  36.  
  37. ###################################################################
  38. # Additional settings - these settings can improve the network
  39. # security of the host and prevent against some network attacks
  40. # including spoofing attacks and man in the middle attacks through
  41. # redirection. Some network environments, however, require that these
  42. # settings are disabled so review and enable them as needed.
  43. #
  44. # Do not accept ICMP redirects (prevent MITM attacks)
  45. #net.ipv4.conf.all.accept_redirects = 0
  46. #net.ipv6.conf.all.accept_redirects = 0
  47. # _or_
  48. # Accept ICMP redirects only for gateways listed in our default
  49. # gateway list (enabled by default)
  50. # net.ipv4.conf.all.secure_redirects = 1
  51. #
  52. # Do not send ICMP redirects (we are not a router)
  53. #net.ipv4.conf.all.send_redirects = 0
  54. #
  55. # Do not accept IP source route packets (we are not a router)
  56. #net.ipv4.conf.all.accept_source_route = 0
  57. #net.ipv6.conf.all.accept_source_route = 0
  58. #
  59. # Log Martian Packets
  60. #net.ipv4.conf.all.log_martians = 1
  61. #
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