WRT54G Access Points Not Broadcasting Correctly

Discussion in 'Networking Issues' started by StenJ, Mar 15, 2006.

  1. StenJ

    StenJ Network Guru Member

    I am in charge of managing the network at my fraternity and I have been having this problem pretty much since I started doing this two years ago.

    The Problem:
    -When trying to connect to the network wirelessly, many of the guys cannot get IP adresses (limited or no connectivity). Some can at some times and some can't at other times...it is NEVER consistant.

    -When connecting to the network via ethernet cable, everything is GOLDEN.

    -Signal strength is great just about everywhere.

    The Network:
    -Two 6mbit ADSL connections
    -Zincom XC-DPG502 Twin WAN Router
    -24 Port Switch (Can't remember brand, could check, but probably doesn't matter)
    -6 V.4 WRT54Gs Set as access points, some running standard firmware, some not (set up the exact way that you say to on your forums)

    This problem fluctuates between mild annoyance and utterly horrible frustration. We are in the middle of finals and I'm totally fed up right now with it. Please, please, for the love of God and all that is holy, please help me! :sadbye:
  2. howardp6

    howardp6 Network Guru Member

    What channels do you have the access point set on? How may users do you have? Are the access points all using the same SSID? You may be having interference problem. You have to set the access points on channels that have minimum overlap auch as 1, 4, 6 and 11. If two access points pick each other up on the same channel they will cease transmissions. Are you using any type of encryption? What device is the DHCP server and how may addresses is it issuing?
  3. StenJ

    StenJ Network Guru Member

    The access point channels are spread out as much as I can. We have about 90 users. They are all broadcasting the same SSID. We are using 128bit WEP security, and the Zincom router is the DHCP. I think that you might be right, though, about the signals walking on top of eachother. I'm testing a few things, will report later with progress.
  4. StenJ

    StenJ Network Guru Member

    Update: I used the channels that you suggested...still nothing.
  5. howardp6

    howardp6 Network Guru Member

    Do any of the clients have the WPA2 hotfix installed, it causes problems with WEP encryption. How many DHCP clients are you allowand and what is the DHCP lease time. Is the Zincom router a commercial grade router? If your clients are using P2P software, they may be opening too many connections for the WRT54Gs to handle and you have to retart them to work properly.
  6. jchuit

    jchuit Network Guru Member

    Mixed mode, cts/rts

    Wireless Roaming:

    Accespoints make use off the cts/rts protocol to clear the channel for broadcasting (1mb-2mbit broadcast).
    If you select the same channel (wireless roaming) the accespoints MUST hear eachother, otherwise this cts/rts protocol won't work (increase txpower).

    Furthermore set on the AP's the CTS/RTS to auto, this will protect weak clients, this is mostly the case in mixed networks.

    Tarifa firmware
  7. StenJ

    StenJ Network Guru Member

    I'm not sure about the WPA2 hotfix, but I do know that we are allowing 100 DHCP clients and the least time is 120 minutes. I think that the router is commercial grade, I will look into this. If people are opening too many connectins for the WRT54Gs to handle, how can I limit the amount of connections that a client can make so that I don't have to keep restarting them?

    I switched the cts to auto, but I didn't see anything about rts in the wireless settings.
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