fjorker.8


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    FJORKER(8)
    System Manager's Manual
    FJORKER(8)
  

NAME
fjorker —
    minimalistic ICMP echo request/reply
  implementation


SYNOPSIS

  
    fjorker
    host
  

    fjorker
    --version
  

DESCRIPTION
The fjorker utility is a secure-by-default ICMP echo
  request/reply implementation that follows OpenBSD's philosophy of minimalism
  and security.
Unlike traditional ping implementations,
    fjorker minimizes information disclosure about the
    source host, uses random identifiers instead of process IDs, validates
    sequence numbers in responses, and has minimal code base for better
    security.

OPTIONS

  --version
  Display version information and exit.


EXIT
  STATUS
The fjorker utility exits 0 on
    success, and >0 if an error occurs.


EXAMPLES

  fjorker 1.1.1.1
  Ping 1.1.1.1 using ICMP echo requests
  fjorker --version
  Display version information


SECURITY
  CONSIDERATIONS
fjorker requires root privileges to create
    raw sockets for ICMP communication. However, the --version option can be
    used without elevated privileges.
The program uses random identifiers instead of process IDs to
    avoid leaking system information. It also validates sequence numbers in
    responses to detect potential ICMP packet manipulation.


SEE
  ALSO
ping(8)


STANDARDS
The fjorker utility implements ICMP echo
    request/reply as described in RFC 792.


HISTORY
The fjorker utility first appeared in
    2025.


    July 31, 2025
    Debian