.\" Copyright (C) 2005, 2006  Stig Venaas <venaas@uninett.no>
.\" Initial man page by Mickael Hoerdt
.TH ssmping "1" "User Manuals"
.SH NAME
ssmping \- check if you can receive IPv4/IPv6 multicast data from an internet
host
.SH SYNOPSIS
.B ssmping
[
.B \-46v
] [
.B \-I
.I interface
] [
.B \-c
.I count
] [
.B \-s
.I size
]
.I host
.sp
.B ssmpingd

.SH DESCRIPTION
.B ssmping
and
.B ssmpingd
are network level multicast management tools that can be used to check whether
one can receive multicast packets via SSM from a host.
The host target given to
.B ssmping
must run the
.B ssmpingd
daemon, which listens on UDP port
.B 4321
for IPv4 and IPv6 unicast requests.
When it receives one, it responds to a well known SSM multicast group which
.B ssmping
just have joined.
Depending on whether the request was made with IPv4 or IPv6, the group is
.B 232.43.211.234
or
.B ff3e::4321:1234
respectively.
.SH OPTIONS
For
.B ssmpingd
there are no options.
For
.B ssmping
the options are as follows.
.TP
.B \-4
Force IPv4
.TP
.B \-6
Force IPv6
.TP
.B \-v
Print client and server version information.
.TP
\fB-I\fR \fIinterface\fR
Interface to join on
.TP
\fB-c\fR \fIcount\fR
Stop after sending (and receiving)
.I count
requests (and replies)
.TP
\fB-s\fR \fIsize\fR
Request replies to have a size of
.I size
bytes
.SH SEE ALSO
asmping(1) a tool for checking whether can receive ASM.
.TP
dbeacon(1) a distributed beacon multicast implementation.
.SH BUGS
Please report them to Stig Venaas <venaas@uninett.no>, the author of this tool.
.SH HISTORY
\fBssmping\fR and \fBssmpingd\fR were developed by Stig Venaas during the
early days of the m6bone, the IPv6 multicast backbone.