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WiFi Cross AP Issue
[版面:热门网络技术][首篇作者:cogt] , 2014年11月17日13:28:42 ,584次阅读,6次回复
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cogt
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发信人: cogt (苦荆茶), 信区: EmergingNetworking
标  题: WiFi Cross AP Issue
关键字: Cross AP
发信站: BBS 未名空间站 (Mon Nov 17 13:28:42 2014, 美东)

Using a custom Linux distro, it uses wifi. When device cross AP, wlan0 lost
connection and reconnects, it also broke the running application. What's the
solution for wifi reconnect when it crosses AP?
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cogt
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发信人: cogt (苦荆茶), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Tue Nov 18 09:08:37 2014, 美东)

The background of my application: I'm using pivothead to stream video, when
cross AP, the streaming stopped.
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cogt
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发信人: cogt (苦荆茶), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Wed Feb  4 14:29:28 2015, 美东)

To close out my own question, this is client (wireless chipset and driver)
related.  The solution is to swap to another hardware.
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namenotavail
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发信人: namenotavail (network_eng), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Wed Feb 18 11:10:31 2015, 美东)

I had the same issue (losing connectivity on roaming and unable to reconnect
without toggling off/on the interface several times) with Debian 7 on a
Thinkpad W with Intel WLAN card iirc, never got a solution (wifi works
flawlessly in Windows on the same hardware)
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cogt
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发信人: cogt (苦荆茶), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Fri May 22 15:06:34 2015, 美东)

It's driver issue.  We swapped to another product which handles AP roaming
well.
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Immphoenix
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发信人: Immphoenix (键盘侠), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Wed Jun  3 03:29:29 2015, 美东)

The network side does need to support inter controller roaming in big wifi
network though.


[在  cogt (苦荆茶) 的大作中提到:]
:It's driver issue.  We swapped to another product which handles AP
roaming
:well.
:...........

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yeckfam
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发信人: yeckfam (Hello World), 信区: EmergingNetworking
标  题: Re: WiFi Cross AP Issue
发信站: BBS 未名空间站 (Fri Sep 25 20:12:20 2015, 美东)


【 在 cogt (苦荆茶) 的大作中提到: 】
: Using a custom Linux distro, it uses wifi. When device cross AP, wlan0
lost
: connection and reconnects, it also broke the running application. What's
the
:  solution for wifi reconnect when it crosses AP?

What do you mean by "device cross AP"? Do you have multiple APs?

Using openflow to rewrite mac address of client seen by AP can solve the
problem. But you need openflow-enabled APs. Try to install openwrt and then
install openflow packages. You also need a controller (floodlight mayber)
and a simple java script to implement packet header rewrite. Then, the
client can act as it never roams :)
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