pppoe-sniff(8) -- Linux man page
NAME
pppoe-sniff - examine network for non-standard PPPoE frames
SYNOPSIS
pppoe-sniff [options]
DESCRIPTION
pppoe-sniff listens for likely-looking PPPoE PADR and session frames
and deduces extra options required for pppoe(8) to work.
Some DSL providers seem to use non-standard frame types for PPPoE frames,
and/or require a certain value in the Service-Name field. It is often
easier to sniff those values from a machine which can successfully connect
rather than try to pry them out of the DSL provider.
To use pppoe-sniff, you need two computers, a DSL modem and
an Ethernet hub (not an Ethernet switch.)
If the DSL modem normally connects directly to your computer's
Ethernet card, connect it to the "uplink" port on the Ethernet hub.
Plug two computers into normal ports on the hub. On one computer, run
whatever software the DSL provider gave you on whatever operating
system the DSL provider supports. On the other computer, run Linux and
log in as root.
On the Linux machine, put the Ethernet interface into promiscuous mode
and start pppoe-sniff. If the ethernet interface is eth0,
for example, type these commands:
ifconfig eth0 promisc
pppoe-sniff -I eth0
On the other machine, start your DSL connection as usual. After a short
time, pppoe-sniff should print recommendations for the value
of PPPOE_EXTRA. Set this value in /etc/ppp/pppoe.conf.
If pppoe-sniff indicates that something special is required in
PPPOE_EXTRA, please e-mail this to pppoe@roaringpenguin.com
along with the name of your ISP and the manufacturer and model number of
your DSL modem. This information will be collated and provided on the
PPPoE web page for users who do not have two computers.
After pppoe-sniff finishes (or you stop it if it seems hung),
remember to turn off promiscuous mode:
ifconfig eth0 -promisc
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"
and in promiscuous mode before you start pppoe-sniff.
- -V
-
The -V option causes pppoe-sniff to print its version number and
exit.
BUGS
pppoe-sniff only works on Linux.
AUTHORS
pppoe-sniff was written by David F. Skoll <dfs@roaringpenguin.com>.
The pppoe home page is http://www.roaringpenguin.com/pppoe/.
SEE ALSO
adsl-start(8), adsl-stop(8), adsl-connect(8), pppd(8), pppoe.conf(5),
pppoe(8), adsl-setup(8), adsl-status(8), pppoe-server(8), pppoe-relay(8)
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