Re: [DNA] Comments on draft-shim-dna-proactive-00.txt

[Eunsoo Shim <eunsoo@nec-labs.com>]

Hi, Daniel,

The L2 ID should be defined for each wireless link technology.
It should be the MAC address of the AP for 802.11.
Talking about WLAN, the ESSID (I think you are talking about ESSID rather
than SSID.) of the AP is configurable as you said. It is possible to
configure the APs attached to the same AR with the same ESSID and let the
ESSIDs different for different subnet. If this is specified in 802.11
standards, the ESSID can tell whether two APs belong to the same subnet or
not.
But this is not a part of 802.11 standards. Nor is it a conventional way of
802.11 deployment. The ESSID is used to specifiy the user group or
administrative domain rather than the network topology. Therefore, two APs
belonging to different subnets can have the same ESSID or two APs in the
same subnet can have different ESSIDs in reality. I am not sure it is wise
to propose to change the way the ESSID is used because of DNA.

Also please note that the proactive approach is applied to wireless networks
in general but not limited to any specific L2 technology.
And please note that the CARD protocol can deliver information required for
IP configuration such as the network prefix. So if the new AP belongs to a
different subnet, the information previously delivered by the CARD protocol
can help expediate the IP configuration after handoff. It can do more than
just telling whether the new AP belongs to the same subnet as the old AP.

By the way, the CARD protocol is a possible tool for the proactive approach.
Other tools can be used, too.

Regards,

Eunsoo


----- Original Message ----- 
From: "S. Daniel Park" <soohong.park@samsung.com>
To: <dna@eng.monash.edu.au>
Cc: "'S. Daniel Park'" <soohong.park@samsung.com>
Sent: Thursday, February 26, 2004 11:59 PM
Subject: [DNA] Comments on draft-shim-dna-proactive-00.txt


>
> This draft defined a L2 ID and used a CARD protocol among ARs
> to share its information such as joined APs L2 ID and so on...
> If yes, I don't make sense why we need to define a L2 ID and
> use a CARD protocol newly. SSID is a configurable identification
> that allows clients to communicate to the appropriate AP. With
> proper configuration, only clients that are configured with the same
> SSID can communicate with AP having the same SSID. So if we
> configure the same SSID to APs that are connected to the same AR,
> clients can detect its moving either to the same subnet or to the
> different
> one without a new defined ID and CARD protocol.
> Am I missing anything ?
>
>
> Thanks in advance.
>
>
>
> - Daniel (Soohong Daniel Park)
> - Mobile Platform Laboratory, SAMSUNG Electronics.
>
>