offset wrote:
> I've been playing with arp poisoning lately and had
some questions about arp poisoning without layer 3.
>
> Is it possible to configure a linux system with one NIC
to act as a layer 2 bridge instead of using IP forwarding
(layer 3)?
>
> I can poison another systems arp cache to come to my
MAC address for its default gateway, but I'd like to do mitm
snooping without my NIC having an IP address signed.
>
> Just asking if this is a possibility to configure linux
bridging to route traffic destined for my MAC to be routed
back out at layer 2 to the real default gateway MAC.
>
> I've been playing around with setting up a layer 2
bridge (bridge-utils) on linux, but not sure if I can say,
all packets that arrive to my bridge via arp poisoning will
be re-routed out to the default gateway MAC to keep the
victims network from halting due to lack of layer 3 (no ip
address to forward through).
>
> Regards,
You should REALLY take a look at this new book -- it is
GREAT info on just your question:
LAN Switch Security: What Hackers Know About Your
Switches
Vyncke & Paggen
Cisco Press (c) 2008 (Yes, that date is the date in the
book!)
ISBN 978-1-58705-259-9 / 1-58705-256-3
This book is a MUST READ for all pen testers!
Jon
--
Jon R. Kibler
Chief Technical Officer
Advanced Systems Engineering Technology, Inc.
Charleston, SC USA
(843) 849-8214
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