Bogon filtering

Source: Wikipedia, the free encyclopedia.

Bogon filtering is the practice of blocking

packets known as bogons, which are ones sent to a computer network claiming to originate from invalid or bogus IP addresses, known as bogon addresses.[1]

Etymology

The term bogon stems from

hackish sense of being incorrect, absurd, and useless.[citation needed] An alternative etymology suggests that 'bogon' derives from a portmanteau of "bogus logon", or a logon from a place you know no one can actually logon.[3]

Types of bogon addresses

Areas of unallocated address space are called the bogon space. These are that are not in any range allocated the Internet Assigned Numbers Authority (IANA) or a regional Internet registry (RIR) for public internet use.

Bogon IPs also include some address ranges from allocated space. For example, addresses reserved for

private networks[4][5], such as those in 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 and fc00::/7,[5] loopback interfaces like 127.0.0.0/8 and ::1, and link-local addresses like 169.254.0.0/16 and fe80::/64 can be bogon addresses. Addresses for Carrier-grade NAT, Teredo, and 6to4 and documentation prefixes also fall into this category.[6] IP packets using these as source addresses are sometimes known as Martian packets
.

Blocking and filtering

Many

BGP blackholing
.

Former bogon addresses

IP addresses in the bogon space may cease to be bogons because IANA frequently assigns new address. Announcements of new assignments are often published on

NANOG) to ensure that bogon filtering can be removed for addresses that have become legitimate. For example, addresses in 49.0.0.0/8 were not allocated prior to August 2010, but are now used by APNIC.[7]

As of November 2011[update], the Internet Engineering Task Force (IETF) recommends that, since there are no longer any unallocated IPv4 /8s, IPv4 bogon filters based on registration status should be removed.[8] However, bogon filters still need to check for Martian packets.

See also

References

  1. ^ "What is a bogon address?". APNIC. Retrieved 1 November 2024.
  2. ^ Guy L. Steele Jr.; Donald R. Woods; Raphael A. Finkel; Mark R. Crispin; Richard M. Stallman; Geoffrey S. Goodfellow (1983). "The Hacker's Dictionary: A Guide to the World of Computer Wizards". Jargon File Text Archive : A large collection of historical versions of the Jargon File. Archived from the original on November 8, 2020. Retrieved 28 May 2021.
  3. ^ "Ian McAnerin and Mike Churchill - 2005". McAnerin Networks Inc. Archived from the original on 2007-04-14. Retrieved 16 May 2020.
  4. doi:10.17487/RFC1918. BCP 5. RFC 1918. Best Current Practice 5. Obsoletes RFC 1627 and 1597. Updated by RFC 6761
    .
  5. ^
    doi:10.17487/RFC4193. RFC 4193
    . Proposed Standard.
  6. ^ "Bogon IP addresses". ipgeolocation. Retrieved 27 Jan 2022.
  7. ^ "IANA IPv4 Address Space Registry". IANA. 2010-02-22. Archived from the original on 2010-04-30. Retrieved 2010-03-18.
  8. ISSN 2070-1721. BCP 171. RFC 6441
    . Best Current Practice.
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