linkloop.1

.TH "linkloop" "1" "1.0.1" "Oron Peled & Dominique Domet de Mont" "Network Utilities"
.SH "NAME"
.LP 
linkloop & linkloop_reply & lanscan \- Link layer (layer\-2) connectivity testing

.SH "SYNTAX"
.LP 
linkloop [options] destination
.LP 
linkloop_reply interface_list

.SH "DESCRIPTION"
.LP 
This program is similar to ping(1), but tests connectivity at the
link layer (layer\-2) instead of the network layer (layer\-3).

It receives one parameter which is the destination address, sends a
special LLC\-TEST packet and waits for a reply.

linkloop_reply runs as a daemon, listening at the llc level on network interfaces 
passed on the command line, and responding by sending back a test packet.
On RedHat flavor systems, linkloop_reply is delivered as a service: /etc/init.d/linkloopd,
offering start, stop, restart and status services. Starting linkloop_reply as a service
will make it listen all interfaces detected by lanscan utility.

The destination address can be given in the following forms:
.LP 
.TP 
\fBcolon separated\fR
Example: 00:02:B3:C0:DC:CA
.TP 
\fBHexadecimal\fR
Example: 0x0002B3C0DCCA
.TP 
\fBName\fR
Taken from /etc/ethers

.SH "OPTIONS"
.LP 
.TP 
\-d
Debug
.TP 
\-i<iface>
Network interface
.TP 
\-t<timeout>
Timeout between packets
.TP 
\-n<retries>
Number of retries
.TP 
\-s<size>
Packet size in bytes
.SH "EXAMPLES"
.TP 
linkloop 08:00:09:91:88:FE
Default test against given MAC address
.TP 
linkloop \-i eth1 \-t 3 \-n 5 hp\-715
Testing via eth1 with 3 seconds timeout and 5 frames.
Run the test against the mac of hp\-715 as taken from
the /etc/ethers database.
.TP 
linkloop_reply eth0 eth3
Listening and responding on interfaces eth0 and eth3

.TP
service linkloopd start
Listening and responding on all known interfaces, as reported by lanscan -o

.SH "AUTHORS"
.LP 
Oron Peled <oron@actcom.co.il>
.LP 
Dominique Domet de Mont <Dominique.Domet-de-Mont@hp.com>
.SH "SEE ALSO"
.LP 
ping(1) ip(8)