Ethernet Card in promiscuous mode

Hello,
I have a Powerbook G4 15p (1.25GHz) and I want to capture network trafic on a cisco trunk port.
It works fine but I have no informations concerning vlan tags : is it possible to configure the Ethernet driver in promiscuous mode ?
Best Regards,
Guillaume
Edit : same problem as describe here : http://support.intel.com/support/network/sb/cs-005897.htm

I was thinking of a network driver option : How can I know what sort of network chipset is on my powerbook ?
If I look to /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns, I can see this :
Apple3Com3C90x.kext AppleDP83816Ethernet.kext AppleRTL8139Ethernet.kext
AppleBCM440XEthernet.kext AppleGMACEthernet.kext AppleRTL8169Ethernet.kext
AppleBCM5701Ethernet.kext AppleIntel8254XEthernet.kext Apple_DEC21x4Ethernet.kext
AppleBMacEthernet.kext AppleIntel8255x.kext
and there is the possibility to update an xml config file on some driver modules
Here is the result of my kextstat :
34 3 0x2dd90000 0x1f000 0x1e000 com.apple.iokit.IONetworkingFamily (1.5.0) <6 5 4 3 2>
  Mac OS X (10.4.3)  

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