pppoe-sniff - examine network for non-standard PPPoE
frames
SYNOPSIS
pppoe-sniff [options]
DESCRIPTION
pppoe-sniff listens for likely-looking PPPoE PADR and ses
sion 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 com
puter'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 recommenda
tions for the value of PPPOE_EXTRA. Set this value in
/etc/ppp/pppoe.conf. If pppoe-sniff indicates that some
thing 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 comput
ers.
After pppoe-sniff finishes (or you stop it if it seems
hung), remember to turn off promiscuous mode:
ifconfig eth0 -promisc
-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 ver
sion number and exit.
BUGS
pppoe-sniff only works on Linux.
AUTHORS
pppoe-sniff was written by David F. Skoll <dfs@roaringpen
guin.com>.
The pppoe home page is http://www.roaringpen
guin.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)
Man(1) output converted with
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