[Ns-bugs] [Bug 510] NqstaWifiMac Lies About SupportsSendFrom?
code at nsnam.ece.gatech.edu
Fri Feb 27 01:55:49 PST 2009
--- Comment #9 from Gustavo J. A. M. Carneiro <gjcarneiro at gmail.com> 2009-02-27 04:55:49 EDT ---
(In reply to comment #8)
> (In reply to comment #3)
> > No, I mean the other way around. I think we had already concluded in the
> > mailing list that STAs cannot do bridging, only APs. This is a limitation of
> > real world, not of NS-3.
> In the dot11 standard exists 4-address scheme for DS-to-DS communications. The
> 4th address is real source address(SA) , the others as usual RA, DA,TA. In
> bridging mode one can utilize this ability of the protocol to send packet
> transparently through bridging STA. It can be done by maintaining WDS table,
> filled on-demand.
But DS-to-DS is meant only to be used between APs, never STAs, so my statement
that only APs can do bridging is still true. :-)
But you make a good point. One option to implement the needed functionality
would be to add WDS support to NqapWifiMac.
> About real world: All drivers used net80211 stack( all FreeBSD wireless
> subsystem, MadWifi( for Atheros ) provide bridging functionality on the STA in
> the way described above.
Correction, they provide bridging functionality in a "WiFi NIC", not a "STA".
I would call STA more of a role rather than a hardware.
And I know from experience that not all cards support this. For instance, the
Cisco cards that I used do not support it at all. This is very non-standard.
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