Virtual WiFi on Linux?
jim at netgate.com
Thu Oct 20 08:06:16 EDT 2005
On Oct 19, 2005, at 9:59 PM, Dan Searle wrote:
> Talking somewhat specifically about Madwifi here, but what I'm saying
> could be taken in a more generic sense....
> Surely to run virtual AP's you need the NIC's to possess more than one
> MAC address, i.e. for 16 Virtual AP's, you need 16 MAC addresses.
Well, to run one style of "Virtual AP", you would want 16 different
> Then, run 16 separate MAC layers with some kind of modification to the
> HAL to share (schedule) the PHY layer between the 16 MAC layers.
No, you 'multiplex' 16 instances of the "upper MAC" over a single
instance of the "lower MAC".
> I.e. run 16 802.11 protocol stacks on top of a modified HAL which
> contains some kind of intelligent PHY scheduler, to make sure we're
> fair about how much time each MAC layer gets on the PHY.
No HAL modifications are required to implement such a scheduler.
> Received frames are not under our control, so all the scheduler would
> have to do is share out the PHY transmit buffer (e.g. SFQ?).
> I think this would require either modifying any existing lower MAC
> (HAL), or perhaps writing a completely new lower MAC (HAL).
The HAL (in madwifi anyway) is not the "lower MAC".
> Regards, Dan...
> Thursday, October 20, 2005, 8:48:39 AM, you wrote:
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>> Lancom is using something like that with atheros cards (L54A/AG).
>> You can configure up to 8 SSIDs with different security (WEP, WPA1,
>> WPA2, etc). Every SSID has a different MAC (they increment the
>> first MAC
>> Byte). While using this feature i saw that the throuput went down
>> more then one SSID. I think its a matter of fragmentation on
>> wireless layer.
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> Dan Searle
> Adelix Ltd
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