1PPPOE-SNIFF(8)              System Manager's Manual             PPPOE-SNIFF(8)
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NAME

6       pppoe-sniff - examine network for non-standard PPPoE frames
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SYNOPSIS

9       pppoe-sniff [options]
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DESCRIPTION

13       pppoe-sniff  listens  for  likely-looking PPPoE PADR and session frames
14       and deduces extra options required for pppoe(8) to work.
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16       Some DSL providers seem to  use  non-standard  frame  types  for  PPPoE
17       frames,  and/or  require a certain value in the Service-Name field.  It
18       is often easier to sniff those values from a machine which can success‐
19       fully connect rather than try to pry them out of the DSL provider.
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21       To use pppoe-sniff, you need two computers, a DSL modem and an Ethernet
22       hub (not an Ethernet switch.)
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24       If the DSL modem normally connects directly to your computer's Ethernet
25       card,  connect  it  to the "uplink" port on the Ethernet hub.  Plug two
26       computers into normal ports on the hub.  On one computer, run  whatever
27       software the DSL provider gave you on whatever operating system the DSL
28       provider supports.  On the other computer, run  Linux  and  log  in  as
29       root.
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31       On  the Linux machine, put the Ethernet interface into promiscuous mode
32       and start pppoe-sniff.  If the ethernet interface is eth0, for example,
33       type these commands:
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35            ifconfig eth0 promisc
36            pppoe-sniff -I eth0
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38       On  the  other  machine,  start  your DSL connection as usual.  After a
39       short time, pppoe-sniff should print recommendations for the  value  of
40       PPPOE_EXTRA.   Set  this  value in /etc/ppp/pppoe.conf.  If pppoe-sniff
41       indicates that something special is required in PPPOE_EXTRA, please  e-
42       mail  this  to pppoe@roaringpenguin.com along with the name of your ISP
43       and the manufacturer and model number of your DSL modem.  This informa‐
44       tion  will be collated and provided on the PPPoE web page for users who
45       do not have two computers.
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47       After pppoe-sniff finishes (or you stop it if it seems hung),  remember
48       to turn off promiscuous mode:
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50            ifconfig eth0 -promisc
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OPTIONS

54       -I interface
55              The  -I  option  specifies the Ethernet interface to use.  Under
56              Linux, it is typically eth0 or eth1.  The  interface  should  be
57              "up" and in promiscuous mode before you start pppoe-sniff.
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60       -V     The -V option causes pppoe-sniff to print its version number and
61              exit.
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BUGS

65       pppoe-sniff only works on Linux.
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AUTHORS

69       pppoe-sniff was written by David F. Skoll <dfs@roaringpenguin.com>.
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71       The pppoe home page is http://www.roaringpenguin.com/pppoe/.
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SEE ALSO

75       pppoe-start(8),     pppoe-stop(8),      pppoe-connect(8),      pppd(8),
76       pppoe.conf(5),   pppoe(8),   pppoe-setup(8),   pppoe-status(8),  pppoe-
77       server(8), pppoe-relay(8)
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824th Berkeley Distribution         3 July 2000                   PPPOE-SNIFF(8)
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