Penetration Testing: MITM ADSL IPoE

["frog horror" <frogho () gmail com>]

Hi all,
I am trying to build a scenario where I could do a kind of MITM
connexion between a device (like a Residential Gateway) and the my
ADSL line (DSLAM). The WAN connexion is an IPoE over ATM connexion
without any kind of 802.1X (just Ethernet and DHCP on top of that...).
Therfore, I can imagine how easy it can be to insert a fake
Residential Gateway but what about a real MITM attack with a valid
Residential Gateway and my laptop betwwen the RG and the DSLAM. I am
pretty aware about kind of Layer 2/3 attacks and requirements but I am
still confused about the physical connectivity and what I need to
do/build to do such a thing.
Did any of you already experience that kind of things?
Thanks for your help
Frog

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