PPPOE-DISCOVERY(8) System Manager's Manual PPPOE-DISCOVERY(8)
NAME
pppoe-discovery - perform PPPoE discovery
SYNOPSIS
pppoe-discovery [ options ]
pppoe-discovery { -V | -h }
DESCRIPTION
pppoe-discovery performs the same discovery process as pppoe, but does
not initiate a session. It sends a PADI packet and then prints the
names of access concentrators in each PADO packet it receives.
OPTIONS
-I interface
The -I option specifies the Ethernet interface to use. Under
Linux, it is typically eth0 or eth1. The interface should be
“up” before you start pppoe-discovery, but should not be config-
ured to have an IP address. The default interface is eth0.
-D file_name
The -D option causes every packet to be dumped to the specified
file_name. This is intended for debugging only.
-U
Causes pppoe-discovery to use the Host-Uniq tag in its discovery
packets. The value of the tag is derived from the process's PID
number. This lets you run multiple instances of pppoe-discovery
and/or pppd without having their discovery packets interfere
with one another. You must supply this option to all instances
that you intend to run simultaneously. This option is mutually
exclusive with -W.
-W value
Causes pppoe-discovery to use the Host-Uniq tag in its discovery
packets. The value of the tag is taken from the option argument,
encoded as a string of hexadecimal digits. This lets you run
multiple instances of pppoe-discovery and/or pppd without having
their discovery packets interfere with one another. You must
supply this option to all instances that you intend to run si-
multaneously. This option is mutually exclusive with -U.
-S service_name
Specifies the desired service name. pppoe-discovery will only
accept access concentrators which can provide the specified ser-
vice. In most cases, you should not specify this option. Use
it only if you know that there are multiple access concentrators
or know that you need a specific service name.
-C ac_name
Specifies the desired access concentrator name. pppoe-discovery
will only accept the specified access concentrator. In most
cases, you should not specify this option. Use it only if you
know that there are multiple access concentrators. If both the
-S and -C options are specified, they must both match.
-Q
Causes pppoe-discovery to avoid printing discovered access con-
centrator names. This can be useful in scripts, which can use
the exit code of the program to determine whether any matching
access concentrators were discovered.
-t timeout
Changes the discovery timeout for PADI requests, in seconds.
The default value is 5 seconds.
-a attempts
Changes the number of PADI discovery attempts made. By default,
3 attempts are made to discover access concentrators before giv-
ing up.
-V | -h
Either of these options causes pppoe-discovery to print its ver-
sion number and usage information, then exit.
AUTHORS
pppoe-discovery was written by Marco d'Itri <md@linux.it>, based on pp-
poe by David F. Skoll <dfs@roaringpenguin.com>.
SEE ALSO
pppoe(8), pppoe-sniff(8)
12 January 2019 PPPOE-DISCOVERY(8)
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