.Dd July 31, 2025
.Dt FJORKER 8
.Os
.Sh NAME
.Nm fjorker
.Nd minimalistic ICMP echo request/reply implementation
.Sh SYNOPSIS
.Nm
.Ar host
.Nm
.Fl -version
.Sh DESCRIPTION
The
.Nm
utility is a secure-by-default ICMP echo request/reply implementation
that follows OpenBSD's philosophy of minimalism and security.
.Pp
Unlike traditional ping implementations,
.Nm
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.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl -version
Display version information and exit.
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
.Bl -tag -width Ds
.It Nm Ar 1.1.1.1
Ping 1.1.1.1 using ICMP echo requests
.It Nm Fl -version
Display version information
.El
.Sh SECURITY CONSIDERATIONS
.Nm
requires root privileges to create raw sockets for ICMP communication.
However, the --version option can be used without elevated privileges.
.Pp
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.
.Sh SEE ALSO
.Xr ping 8
.Sh STANDARDS
The
.Nm
utility implements ICMP echo request/reply as described in RFC 792.
.Sh HISTORY
The
.Nm
utility first appeared in 2025.