Hi Kelly, Thanks very much for the suggestion. I don't have a 5.8G router on hand, but will try to get one asap to verify the bandwidth.
On the other hand, I am already using two non-overlapping channels (1 and 11), the interference (or competition) among them should be minimal. I do expect that there would be some bandwidth drop, but it shouldn't be that much (in my case, the bandwidth loss is about 50%). In addition, I did try to use ad-hoc mode in the same setup, there was only insignificant bandwidth drop (like 5%). The thing is that 802.11N is not supported in Ad hoc mode, and therefore the max. bandwidth achieved was only about 14Mbps. I need more bandwidth and therefore tried the piggy-back AP mode setup (as described in my original post). So, my another question is that, under the same setup, why is the bandwidth drop in piggy-back AP mode so much more significant than ad hoc mode? Thanks very much again in advance. Regards, Robert From: Kelly Hogan Sent: Monday, January 17, 2011 12:57 AM To: OpenWrt Development List Subject: Re: [OpenWrt-Devel] Problem with a piggyback Wifi deployment .. At the rf level, your middle radios are still competing for the same space if they are on the 2.4 spectrum. From the endpoints you are probably creating a packet storm at the middle radios. If you change frequencies on those radios, you will probably see better throughput. I.e. a 5.8 on one, 2.4 on another. Being both are on is not the issue. You really have 4 radios to deal with since the packets of client b will affect client a when tp a has to handle naks and the like, right next to tp b. Have you tried one tp instead of 2. You might see throughput reduced by 1/3rd instead of 1/2. On Jan 16, 2011 9:42 AM, "Robert Chan" <robert.chan.l...@gmail.com> wrote: > Hi all, > > I am implementing a piggy-back style 2-hop Wifi deployment (2-hop is all we > need, so we don’t need mesh) with two TP-Link 741. What I did is the > following: > > clientA ---> TPLinkA-TPLinkB ---> clientB > > The TPLinkA and TPLinkB are installed with backfire and are configured to run > in AP mode. They are directly connected with an Ethernet cable and are set to > channels 1 and 11 respectively. > > After setting it up. I got 30+Mbps from cleintA to TPLinkA and from TPLinkB > to cleintB (using iperf) with both routers switched ON at the same time. > Theoretically, I was hoping to get also 30+MBps from clientA to clientB as > well. However, I only got about 17Mbps and sometimes even as low as 2~3MBps. > > Both TPLinkA and TPLinkB are ON in both cases, so the interference seen by > both clients should be the same in both cases. > > What could I have done wrong? Any help will be very much appreciated. > > Regards, > > Robert. -------------------------------------------------------------------------------- _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
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