On Wed, 2006-04-19 at 19:50 +0800, 陶然余余 wrote: > Hi,Antti! > Thank you for your letter! I am very glad to receive this > letter . > I have already send this mail to the Linux-wlan-ng user mailing > list,but up to now no one answer me:( I know someone has already > actualize the layer 2 triggers to reduce the handoff latency.So I try > to ask for help in this mailing list.I am anxious to solve this > problem ,it may cause your trouble, I am sorry for it!
It's no trouble, but I don't think we can help on a specific driver. Using layer 2 triggers to optimize handoffs is a bit different from what you were asking. 802.11 uses L2 pre-authentication to speed up L2 handoffs, but this requires APs to be in the same ESSID and connected in the same ethernet segment. Node can pre-authenticate before even doing final association with a new AP. For this to work between different networks, you would have to have APs talking over IP. Look for IAPP (Inter-AP protocol) for more information on that. Another thing is that some 802.11 cards allow to be in a "monitor" mode. They scan through channels and look for other nodes (or APs). To fully exploit this feature for hinting L3, you would need two 802.11 cards; one in monitor mode, one doing real traffic (you might be able to switch between the modes with one card too, but that would most likely degrade performance). What you need is a way to get events from the 802.11 card. There is Wireless Extensions to do that. I'm not sure what kind of events you can currently get, but this is the right place to look for. It may also depend on the driver, what functionality is provided. Regards, Antti _______________________________________________ mipl mailing list [email protected] http://www.mobile-ipv6.org/cgi-bin/mailman/listinfo/mipl
