Transparent Config(2)
#bring up the interfaces
ifconfig$COMPINT 0.0.0.0 up promisc
ifconfig$SWINT 0.0.0.0 up promisc
ifconfig$BRINT 0.0.0.0 up promisc
#mii-tool -r will reset the auto negotiation 
essentially resetting the link
mii-tool -r  $SWINT
mii-tool -r  $COMPINT
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Quick Transparent Demo
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WORKING TOWARDS INTERACTION
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On Towards Interaction
Right now the bridge looks like a piece of wire 
on the network, completely transparent.
From a proof of concept point we’ve introduced 
a rogue device onto a wired network secured by 
802.1X.
However, being able to remotely interact with 
the device would be a lot more fun!
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Requirements For Interaction
So, what do we need to make our rogue device 
more interactive?
• Don’t trip up any additional security measures 
(MAC security on top of 802.1X) and kill the 
connection
• Make the traffic look like the computer whose 
connection we’re stealing
• Callouts (both forward and reverse)
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Careful!  Tharbe dragons!
A common configuration includes sticky-MAC 
address filtering on the wire along with 802.1X.
• Need to make sure the MAC address of traffic 
coming out of the bridge matches the client 
computer
• 802.1X usually re-authenticates periodically and 
usually can be forced without incident
• Port security violations usually are manually 
cleared, so tripping is BAD, and unfortunately 
easy to do
Tripping Sticky MAC Port Security
A single stray source MAC address will trigger 
port security.
• Need to make sure no traffic leaves until 
everything is set up
• Start dark and slowly bring up functionality 
until we’re good to go
Things That Bite
Things I’ve been bitten with while working with port security:
• Excess Services(web server, etc)
– What’s the first thing that apache does when it starts up?  Query a name 
server for it’s own IP address…
• IPV6
– Since I’m not doing anything to NAT any IPV6 traffic,  if any escapes the 
bridge it’ll burn us.  Best to just disable
• DNS
– Sometimes simply having entries in resolv.confgenerate traffic unexpectedly 
upon startup (depends on distro)
– Easy to avoid, simply rm/etc/resolv.conf f at boot
• ARP
– Ultimately the cause of most problems –something gets ARP’d
Arptables
Arptablesallows us to block all ARP traffic from an 
interface.  Since ARP usually burns us, we can block 
all traffic originating from our device easily. 
#example arptablescommand
arptables–A OUTPUT –o eth1 –j DROP
Note:  We want ARP traffic to cross the bridge, just 
not leave being sourced by our rogue device
(IP/ARP/EB)tables  Chain Flow Overview
Prerouting–All traffic off the wire
Forward –traffic passing from one interface to another
Input –traffic destined for the local device
Output –traffic leaving the local device from processes
Postrouting–all traffic leaving the device
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