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Date:  Mon, 20 Oct 2003 13:50:47 -0700
Sender: os2-wireless_users-owner <os2-wireless_users-owner@2rosenthals.com>
Reply-To: os2-wireless_users@2rosenthals.com
From:  Lewis G Rosenthal <os2-wireless_users@2rosenthals.com>
To:  os2-wireless_users@2rosenthals.com
Subject: [OS2Wireless] Virtual Switch from Innotek Virtual PC can't see out through Prism mini-pci WiFi of Thinkpad A31

No, MAC address filtering is a different issue entirely. Basically, 
consider a wireless network which is not isolated; e.g., a network 
coexisting with other networks. A client associates with a given AP, 
receives a DHCP address (for the purposes of this argument), and begins 
its session. Another client associates with a different AP, and begins 
its conversation. AP1 pretty much ignores traffic on the other 
conversation as it is not destined to it (i.e., Client2 did not 
associate with it). This is true even if both clients are similarly 
addressed (e.g., both AP's use out-of-the-box addressing schemes, such 
as 192.168.1.x).

APs which work efficiently will completely drop packets passing by which 
are from unassociated clients. Other AP's will listen to all traffic, 
and simply pass it through. I have no idea which ones do one or the 
other; at this point, this appears to be a trial and error sort of 
thing. Perhaps we should start reporting such issues to Jonas for the CHL.

Orest Skrypuch wrote:

> Lewis G Rosenthal wrote:
>
>> A follow-up to my last reply. At Warpstock this morning, I'm sitting 
>> next to Oliver Stein from Innotek, and just asked him about this 
>> issue. Here's a more exact answer:
>>
>> In order for Vswitch to work with Wi-Fi, two things need to happen: 
>> The driver for the card must support promiscuous mode (Jens' drivers 
>> do, others may not); and the access point must be able to work 
>> inefficiently, meaning, it must not discard packets signed with a 
>> different MAC address than the Wi-Fi NIC of the client; many AP's - 
>> for the sake of efficiency and security - simply discard such packets.
>>
>> Which AP are you using?
>
>
> Just jumping into the conversation ...
>
> I use the IBM PCCard wireless, with Jen's drivers (RC3), so the first 
> condition is met. I have an SMC 2804WBR wireless router. Does the 
> latter work "inefficiently". It does have an option to restrict 
> signons to specified MACs, and I leave that configured, but that I 
> think is not quite the same issue.
>
> * Orest
>
>
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-- 
Lewis 
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Lewis G Rosenthal, CNA 
   Rosenthal & Rosenthal 
Accountants / Network Consultants 
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