Date: Thu, 20 Oct 2005 04:24:45 -1000 From: Jim Thompson <jim@netgate.com> To: "Andrew Atrens" <atrens@nortel.com> Cc: freebsd-current@freebsd.org, Jiri Mikulas <konfer@mikulas.com>, Andrew Thompson <thompsa@freebsd.org> Subject: Re: ath client bridge Message-ID: <78A36290-42C1-4A63-893B-7B4DCDA5CF3C@netgate.com> In-Reply-To: <4357A115.50106@nortel.com> References: <43560B6A.4070505@mikulas.com> <20051019091559.GA45009@heff.fud.org.nz> <43565782.8080706@nortel.com> <D89799D0-71A2-45FC-8AF5-9C1902FFF5F1@netgate.com> <4357A115.50106@nortel.com>
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On Oct 20, 2005, at 3:52 AM, Andrew Atrens wrote: > Jim Thompson wrote: > >> Now, answer this question: Where do you send the ACKs when SA != TA? >> > > SA I'm guessing. (Only one second of thought though :)). You'd treat > SA like a layer2 gateway. If you don't send an ACK back to TA, then TA will retry (potentially several times). (So the answer is 'TA'.) >>> There is a four address version of the packet header, but as I >>> recall the fourth >>> address is used by TKIP. >>> >> nope. >> > > Thanks. My answer was based on just snoopinig around in the > net80211 source > code - the only usages I found of ieee80211_frame_addr4 were in > crypto_ccmp and > crypto_tkip. because the net80211 code that implements WDS hasn't escaped the lab (yet). > >>> >>> So it's a problem with 802.11 standard. I think that's why they >>> came up with WDS. >>> I think there's some support for WDS in MadWiFi, but not yet in >>> the BSD stack(s). >>> >> As the term is commonly used, WDS *is* the 4-address frame format. >> > > Makes sense. Thought there might be more to it than that, for > instance AP's > tracking/coordinating with other AP's with the same ssid and > channel. But > I really haven't looked at it, to be completely honest. :) > > I know that when I put my laptop in AP mode (same channel and ssid > as my master > AP), on the laptop, I stop hearing packets coming from my master AP. The two APs have no (current) method to send packets to each other across the wireless media. Jim
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