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DCM202, WRT54GL, and WoW

Discussion in 'Cisco/Linksys Wireless Routers' started by Quigs01, Feb 28, 2007.

  1. Quigs01

    Quigs01 LI Guru Member

    Hi folks,

    I've got a D-link DCM 202 cable modem -> WRT54GL (DD-WRT V23SP2 firmware) -> Two wired computers, and one RTP300 Vonage router/phone adapter. The problem I'm having is when I only have one computer up in the morning, I have no problems with latency. I'm only on for a half our or so, so I guess it could be the amount of time. When I come home and start using both computers I start getting not only lag, but "disconnects". I have caught my modem rebooting recently, but it doesn't happen every time I get lag. I play WoW (World of Warcraft) on both computers (my wife plays on the other computer), and it's gotten so bad we can't play together anymore. We tend to start getting disconnected within just a few minutes. If I'm on WoW and she starts using her computer, then I will start to get lag, and most likely disconnect.
     
  2. ifican

    ifican Network Guru Member

    To many unknowns at the moment. There are many cable companies that run shared bandwidth to a community, so when there is minimal traffic your connection is golden but especially in the evening when everyone is home from work, bandwidth availability is minimal. I went through this in the early stages with my cable company but they have since upgraded and the issue went away. Part of what leads me to believe this may still be the case for you, or something along these lines is the fact that you get getting disconnects from your provider.

    I suppose the first test i would do is use both computers in the morning even if its just for 10 or 15 minutes to see if you have an issue then. Run a speed test from your machine in the morning and then again from your machine in the evening then run one from both at the same time. Ultimately you are trying to recreate your disconnects at times other then you are experiencing now. If you can then it may be something with your equipment if not then it may be the network. Also you could run a trace route from both your machine and see where the latency is being introduced.
     
  3. Quigs01

    Quigs01 LI Guru Member

    Good plan, I'll make sure I run them tomorrow morning for a bit. I'll load up WoW on both computers to make sure it works.
     
  4. Quigs01

    Quigs01 LI Guru Member

    Well I tested it out this morning. Was running DD-WRT V23SP2 at the time. Logged in to WoW on the one computer and started out at 200ms latency. Fired up WoW on the other computer. After the second computer started connecting to WoW and my first computer started getting 3k ms ping times. Both computers came up for a few minutes, then both disconnected around the same time. I put on Tomato, and the Linksys firmware with the same results.

    I've been reading that people forward certain ports for WoW, but how is that possible if I have two computers that need those?
     
  5. ka9yhd

    ka9yhd LI Guru Member

    As soon as you said something about your modem disconnecting I would agree that the problem is with your provider.
    I have problems with a DSL line and random disconnects. I can sit here and watch both the atm and dsl lites on the modem go on and off. Also having problems with loosing the PPPoE authentication.
     
  6. ifican

    ifican Network Guru Member

    Ok taking a moment to really think about this from a gaming perspective I dont know if there is a way to fix this and here is why: The WoW servers are going to use only certain port of set of ports randomly to answer anything that is sent from you (your routers IP) to them. In this case you, is 2 different computers ultimately with the same IP (your routers IP). So when the information gets back to your router, your router does the best it can to get it back to the machine that requested it but since the WoW servers are a bit confused that information is not always correct. Realistically this should not be the case unless WoW uses only a very limited number of ports.

    For clarification when you say you get disconnection its from WoW and not from the router correct? What address are you pinging that shows the latency, the router? If connection to the router is good then its probably what i stated above, if the connection to the router (pinging the routers default gateway) is where you are seeing the latency then it still could be related to the issue above and the only thing in my mind that could be causing it is the Wan interface is getting overloaded with so much info that doesnt match up with any of the translations that maybe the router can't keep up or thinks that its receiving a DoS attack which would explain the modem disconnects.

    I know this is alot of info and hopefully i have kept it going in the right direction and simple enough to understand. I hope that I am wrong for your sake, but taking some time to think about it the more sense it makes. Maybe someone that plays a game from multiple machines at the same time will pop in here and give us an easy fix. Good luck with this and feel free to ask if you have any more questions or info you would like to share.
     
  7. Quigs01

    Quigs01 LI Guru Member

    WoW has it's own lag meter that shows current ms lag. I'll poke around and see if I can't dig up a good server to ping (or run a tracert to).

    The only thing I get disconnected from is WoW, and not the router. When I'm getting disconnected, it does really start to slow everything else down. But how would one get disconnected from their router? If it could happen, I could watch for it more closely.
     
  8. ka9yhd

    ka9yhd LI Guru Member

    There are line tests and latency tests over at dslreports.com
     
  9. ifican

    ifican Network Guru Member

    By disconnection from your router, talking more about dropping packets, which if you drop enough you loose connection for a short time. You know what else you could try to add a little more info, find someone you trust and give them your internet (Wan) IP and make sure you allow the router to respond to ping traffic. Have then run a continuous ping to your router let it run for a couple minutes to get a baseline, latency should be pretty stable. Then fire up WoW on one machine and run it for a couple minutes to see a baseline with the one machine, then fire up the second machine and see if it changes. If the ping times stay pretty steady then is server application specific issue and the router itself has no problems dealing with the traffic. If the ping time get really out of whack when you fire up the second machine it could very well still be server app, but at that point its also definitely hardware as well.
     
  10. Quigs01

    Quigs01 LI Guru Member


    Thanks for this! I'll run the test when I get home.
     
  11. Quigs01

    Quigs01 LI Guru Member

    Solved? Maybe not. Got better - yup!

    I was going through dslreports.com FAQ and they mentioned to take a look at Dr. TCP. I downloaded it and ran through a couple trial and error and computational things. I settled on 32062 for my Rcp Receive Window, changed my Selective Acks to Yes, and changed my MTU to 1490. I went around and changed my other computer to that as well. It looks like things are going pretty good! I was able to log onto WoW on both computers for extended periods of time with approx. 200ms lag. Not too bad for PvE games. I don't know how this could really help it too much since I only lowered my MTU by 10, but it does seem to help.
     
  12. ka9yhd

    ka9yhd LI Guru Member

    It is possible that you were dropping packets and by lowering the MTU reduced the size of the packets and your system is handeling the smaller packet size better.

    Also you can keep reducing the MTU until you are not dropping any packets. By doing this you can figure out what max MTU number your system can handle.
     
  13. Quigs01

    Quigs01 LI Guru Member

    I checked this again this morning with just the one computer, and was running about 600ms ping times. :doh:

    Anyways, no disconnects; didn't have time to tracert. I did see last night that my dlink modem had a downstream channel power of -16.5 db. I was reading on dslreports that anything over -15db should be looked at but they didn't mention a remedy. Is this something where I should replace the cable or the splitter?
     
  14. Quigs01

    Quigs01 LI Guru Member

    It was with my modem - sorta. I had between -17.5db and -16.5db downstream channel power. I remembered I have a splitter in my system, since I have dish I didn't need it. I removed the splitter and connected it straight through. Downstream channel power improved to -8db and I'm having fantastic ping times (130ms). I am able to use both computers no problem.
     

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