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Vonage I know that there are lots of questions on this forum regarding how Qos works (or
I know that there are lots of questions on this forum regarding how Qos works (or at least should work) so I though I'd post a quick description of what is supposed to be happening. I can't guarantee that this is actually what's happening as it depends on the implementation.
All packets (tcp & udp, etc..) flow serially through the internet from the origination to the destination. At each router (starting with your RT31P2 to your highspeed modem (cable or dsl, etc,) to their routers....
At each router, there is a queue which is typically a First In First Out, meaning that the queue will send the first packet it receives out before it sends the next packet. Normally, this isn't a problem, but if your downloading or browsing at the same time your listening to a phone call, it may. Your router (RT31P2) is capable of handling speeds of 100Mb while your high speed Internet may range from 512K to 6Mb or so. To be really efficient, your router likes to fill the queue up so it can do other things while the data is being sent downline. (or received) When the queue needs attention, the router services it by putting in more data or taking more out. You should be able to see at this point that if the queue has a bunch of data in it, it may take a bit for your Voip packet to actually get sent to the interface as all the existing data in your queue must be sent first. The biggest backup is the modem as it generally handles the speed reduction from your router (100Mb/s) to your broadband connection (.5 - 8Mbs or so).
The easy way to make your connection seem speedier is to manipulate the packets of information in this queue. If you have a packet of streaming media, web browsing, etc.., you can just put that packet in the que normally. But if you have a packet of Voip data or telnet or ssh perhaps, where even small delays can present a big problem, you can give that packet "cuts" in line; put it at the front of the queue so it is the next packet out.
Unfortunately, your modem is where the biggest bottleneck in packets is and you don't have any control over what the packets are doing there. The routers answer to this is to pretend that your Internet speed is slightly less than it is. You throttle the packet flow in the router so that your modem is never backed up. This puts the bottleneck inside your router where you CAN manipulate the packets. Priority packets such as Voip get sent to the front of the line and bulk packets get put in the back of the line. It works pretty well but you have to sacrifice a bit of overall speed to make it work. You have to have the bottleneck queue under your control.
It's not foolproof either. At any time, any router along the packets path can run into a full queue that is not using Qos and you have the wait times increase again. But since the Internet as a whole generally runs faster than your individual link, you can take care of most of the problem by using Qos.
To set the values in the Qos, your download and upload speeds should be set at 10% or so LOWER than your Internet connection speeds. Then set Voip packets as "high priority". All this does is slow your router down to the maximum speeds you list (to force the bottleneck into your router) and then put high priority packets in the front of the line in the queue. It really is pretty simple if you think about it.
By the way, you can see if the router is really throttling packets like it should by setting the maximum values low (say 512Kb on a 4Mb line) and running the speed test from the forum. IF it states your maximum speeds as the same as what you entered, that part of the router is working. As for managing the queue, since you don't have access to the inner workings of the router either, you can just see if the quality of your phone connection holds while you download a large file via ftp or http.
hope that helps
Randy
Read The Full Thread: Important, Read if you have poor speed tests!!!
• Read this thread here: http://www.vonage-forum.com/sutra22453.html#22453
I
• I must be fortunate. I have my upload set at 256 kb/s and it has worked fine. At least
• 1st question, no... apparently you will get only 60% of that. So, for a 256 setting,
• UNDER QOS i try and put IN 80% OF MY INTERNET SPEED but it slow my connection down
• Someone missed the point of QoS.
• If you have 2 different settings for QoS, I'm guessing you either don't have the
• Yeah, that would be Linksys.
• Someone missed the point of QoS.
LOL very true.
• HAVE THE LINKSY WRT54g wirelessand have the latest (Firmware_Alchemy-6.0rc6a
• First of all, the latest Sveasoft is Alchemy-pre7a v3.37.6.8sv.
Second,
rridley posted "I know that there are lots of questions on this forum regarding how Qos works (or" on 03/18/2005 |
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