How can I force OSX Lion to boot into 32bit mode without having to hold 3 + 2 down on boot?

I have to use the Cisco VPN Client to connect back into work and since upgrading it no longer works on 64bit. Cisco have dropped support for the client as well.

2 Answers 2


There is a Cisco VPN client built-in into Mac OS X. I am currently using it successfully to connect to my university VPN network from home.

Add it as an interface in Network Preferences -

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Quickly connect to the VPN from the menubar -

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  • The OSX client requires a shared secret which the VPN connection doesn't have.
    – digital
    Jul 22, 2011 at 11:39
  • @digital It does. Under advanced options. I use it everyday Jul 22, 2011 at 12:53
  • The VPN setup itself doesn't have one to my knowledge and the OSX VPN connection requires it. Should have worded it better.
    – digital
    Jul 22, 2011 at 13:44

You can modify the com.apple.Boot.plist (found in /Library/Preferences/SystemConfiguration) file with start parameters and also the desired architecture (if you add that section to the file). See the man page here.

  • 1
    Does using sudo systemsetup -setkernelbootarchitecture i386 to set this, instead of editing the plist file, work in Lion?
    – David
    Jul 22, 2011 at 12:19

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