Bridge Utilsin Linux
Use Bridge Utilsto create a transparent bridge in Linux on 
a machine with 2 or more Ethernet cards.  By default 
the bridge will have the highest MAC address.
brctlis the main utility to configure a bridge in Linux:
brctladdbrbr0               # create a bridge device called br0
brctladdifbr0 eth1       # add eth1 to br0
brctladdifbr0 eth2        # add eth2 to br0
ifconfig0.0.0.0 eth1 up   # bring up the eth1 interface
ifconfig0.0.0.0 eth2 up   # bring up the eth2 interface
ifconfig0.0.0.0 br0 up     # bring up the bridge interface
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It Can’t Be THATEasy…
It’s not… no traffic on the bridge interface
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The 802.1D standard
Turns out that standards compliant bridges aren’t 
supposed to pass MAC addresses in the range of 
01-80-C2-00-00-00 to 01-80-C2-00-00-0F.  In our 
case 01:80:c2:00:00:03is used
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Simply Back Out the Patch
Seems like a simple fix, back out the patch that 
blocks the MAC addresses we care about.
Unfortunately the bridge module code has 
changed a fair amount in the past 4 years.  
Fortunately, Abbof Gremwellsecurity already 
fixed the problem.
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Abbof Gremwell’sResearch
Abbprovided a patch to forward the MAC 
addresses that are dropped by the 802.1D spec to 
the GremwellBlog.
Abbalso posted the code for an app called Marvin 
where he “decided to write a tool, capable to divert 
and re-inject a network connections while 
preserving the original network addresses, including 
layer 2 ones… but it already can be used to tap into 
a wired network protected with 802.1X”
Abbfrom Gremwell’sMarvin
“The tool will bridge the traffic between the first and the 
second interface and inject traffic it receives from the third 
interface into the first two.”
Marvin at a glace:
• Written in Java
• Requires 3 network ports: source, destand injection
• Requires manual setting of MAC/IP
• Allows interaction with traffic going across the bridge
Not quite what we want, but it works and for some 
assessments, it might be worth a look.  I’ve included the link 
at the end in the ‘Links’ section
Abb’sPatch
The patch just comments out the code that 
drops the EAPOL.  Simply recompile the module 
with the code commented out. 
Recompile the Bridge Module
It Works!
Truly Transparent Config
#!/bin/bash
BRINT=br0
SWINT=eth0
COMPINT=eth3
#enable ip_forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward
# create the bridge
brctladdbr$BRINT
brctladdif$BRINT $COMPINT
brctladdif$BRINT $SWINT
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