[RP-PPPoE] PPPoE relay - forwards unknown MAC address packets

[Ashmath Khan]

> So what you are saying is that you see stray packets comming from the
> wan side, which is being forwarded to the lan side then. Can you produce
> a tcpdump capture of the packets in question? Also can you show us your
> pppoe-relay configuration?

Hi Mike,

The device i am using currently doesn't support tcpdump but I did capture
wireshark dump on both LAN and WAN side i.e, I ran wireshark on the
PC(Ubuntu) which is acting as pppoe server and on the LAN PC(windows)
where pppoe client is run. From the server PC i injected a PADT packet
but with wrong destination MAC address using packeth software, I see
that the on the client PC, the packet is received and the pppoe
session is killed. Please let me know if this is a pppoe software
issue and where should I look for to fix this. I am attaching the
wireshark captured files.
pppoe relay is run like this:
pppoe-relay -C br1 -S eth5 -n 4 -i 600 -F
  this is run from an application after doing fork and execv

thank you.
-Hashmat

On Fri, Aug 6, 2010 at 9:13 PM, Insane Laughing Clown
<mike-rppppoe at tiedyenetworks.com> wrote:
> Ashmath Khan wrote:
>>
>> Hi,
>>
>> can somebody please reply ?
>>
>> thank you.
>>
>> On Tue, Aug 3, 2010 at 12:53 PM, Ashmath Khan <hashmat.email at gmail.com>
>> wrote:
>>
>>>
>>> Hi,
>>>
>>> I am seeing an issue with pppoe relay agent with forwarding packets
>>> having unknown MAC address.
>>> Say I have a device with eth0 and eth1 interface.
>>> eth0 - client side (LAN)
>>> eth1 - server side (WAN)
>>>
>>> After PPPoE session is established,
>>> from eth1 send a PPPoE packet with unknown MAC address. Its seen that
>>> the packet gets forwarded onto eth0 and received by the client on LAN
>>> side.
>>>
>>> Is there a way PPPoE relay agent can filter these kind of packets with
>>> unknown MAC address ?
>>>
>>> thanks
>>> Hashmat
>>>
>>>
>
>
> So what you are saying is that you see stray packets comming from the
> wan side, which is being forwarded to the lan side then. Can you produce
> a tcpdump capture of the packets in question? Also can you show us your
> pppoe-relay configuration?
>
> -ILC
>
>
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>
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