File:  [NetBSD Developer Wiki] / wikisrc / tutorials / faking_a_mac_address.mdwn
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Mon Nov 21 03:22:58 2011 UTC (2 years, 5 months ago) by mspo
Branches: MAIN
CVS tags: HEAD
finish importing the pages from my findings in the pkgsrc.se wiki

Since 5.0 NetBSD supports changing the MAC address. 

Add a link-layer address to an Ethernet: 
    
    # ifconfig sip0 link 00:11:22:33:44:55
    

Add and activate a link-layer address: 
    
    # ifconfig sip0 link 00:11:22:33:44:55 active
    

  
This should give some idea: 
    
    
    ifconfig bridge0 create
    ifconfig bridge0 up
    ifconfig vr0 up
    brconfig bridge0 add vr0
    ifconfig tap0 create
    sysctl -w net.link.tap.tap0=00:00:de:ad:be:ef
    ifconfig tap0 up
    brconfig bridge0 add tap0
    

Now you can get an ip if from dhcp with the fake MAC: 
    
    dhclient tap0
    

##  See also 

  * [ifconfig(8)](http://netbsd.gw.com/cgi-bin/man-cgi?ifconfig+8+NetBSD-current)

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