Can you post your configs? Essentially, in order to keep the latency as low as possible, you need to make sure that you never exceed the bandwidth of the upstream link. Whilst doing this, you are able to ensure that your VOIP performance is good. If you are not throttling your bandwidth, then just re-prioritising your VOIP traffic will not help. As soon as you do a large download, your link gets saturated and the latency goes up. Once that happens, even if your router is re-prioritising the VOIP traffic, it is still latent, which means that your phone performance will suffer. By setting the upload and download speeds lower than the line speed, you ensure that the line does not get latent, and then your re-prioritising is effective. Most people seem to be of the opinion that around 80% or so of the line speed is a good rule of thumb. -----Original Message----- From: lartc-bounces@xxxxxxxxxxxxxxx [mailto:lartc-bounces@xxxxxxxxxxxxxxx] On Behalf Of Stefanie Tellex Sent: Friday, 7 September 2007 11:49 PM To: lartc@xxxxxxxxxxxxxxx Subject: Prioritizing VOIP traffic without sacrificing throughput Hi, I would like to prioritize VOIP traffic when we use the phone, but other times not do traffic shaping at all. Right now I have my openwrt router set up with htb to do shaping. In order to get it to work well I had to set my upload and download speeds much lower than my line speed. With these settings, I get good VOIP reception even while surfing the net and doing a long download. However, even when I'm not using the phone, a long download is more than twice as slow than it is with shaping turned off. Is there some way to configure it to only do shaping when it detects VOIP packets, and otherwise not limit traffic? Thanks, Stefanie _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
