Sudden WNIC connectivity issues

Discussion in 'Networking Issues' started by HatTrick, Oct 2, 2005.

  1. HatTrick

    HatTrick Network Guru Member

    Hi, I'm not that new to networking, in fact part of the final year couses I am taking ina computer engineering program is a course based on the first CCNA course that Cisco defines. But still having issues with wireless nic and router.

    Anyways i'll start with my network setup

    6Mb/s Cable Internet
    WRT54GSv1 running HyperWRT 2.1b1 (didnt tell Linksys tech support) with power output at 100%, though same issue started with latest Linksys firmware and output power at defaul level. Using WPA-PSK with AES and SSID broadcast disabled
    LAN/WAN clients, NIC with issue is WMP54GS with high gain antenna

    Issue is with my desktop two floors above the router on wireless using WMP54GS, System is WinXP SP2, P4 1.5GHz, 768MB PC800 RDRAM, 40GB HDD, daily browser Mozilla Suite 1.7.8. Symantec SW2005 with latest definitions running, Lavasoft Ad-Aware running, no Windows Firewall.

    Issue: Indefinitly attempts to aquire IP, if static IP set in correct IP # range, and DNS servers set correctly, appears to have network connection, but no Internet. All wired and other wireless clients have no connectivity issues.

    Troubleshooting attempted: some troubleshooting was done on mt own and others with Linksys tech support, both 1st and 2nd levels. Set static IP with correct gateway/subnet mask/DNS servers, no luck. replace older version of router firmware with latest version, no luck, replace firmware with HyperWRT and boost signal strength, no luck. Uninstall drivers for NIC, re-install with latest drivers for NIC from linksys website, also start using Linksys Wireless manager which constantly reports connection to router, but not to internet, and better signal strength thanks to new router firmware.
    Last dith effort with tech support was to power cycle the network, or atleast the cable modem, router, and my pc, no luck, but while i was on hold, i assume waiting for the 2nd level tech to arrange for 3rd level tech for me, it decided to five me and IP and net access, which lasted from about 9:30 last night to sometime this mornign after I went to work. Decent speeds too it seemed while online last night, no problems anymore i though. I come home from work and I am back in the situation, though my msn just came online it seems (I am on my dads laptop with a built in Atheros SuperG which connects no problem, and on my moms msn, and i saw mine come online).

    So whats going on? Now if I loose the IP# i'm gonna have to wait hours to get connectivity again? I shouldnt loose the IP# in the first place and if I do it shouldnt take so long to get it back.

    Any solutions?

    thanks in advance
  2. danielhaden

    danielhaden Network Guru Member

    Wireless authentication failure.

    2 possible causes:
    WPA is reliant on SSID, but you have it turned off.
    This should cause many clients to fail wireless authentication.

    Speedbooster gives wireline speed to speedbooster clients at short range. To use a speedbooster client at long range, the speedbooster feature must be disabled or authentication will fail.

    Also suggest putting HyperWRT back on and using the 84mw setting. Slant one of the wireless router's antennas so that its broadside (not tip) is directed at your wireless client. That's because no signal comes out of the tip of the antenna--the signal comes out of the broadside in a "doughnut" like pattern. On the client device (your computer), orient its antenna so that the broad side (not tip) is directed at the wireless router, and in the exact same angle/orientation. That's a place to start.
  3. danielhaden

    danielhaden Network Guru Member

    With the latest Linksys router firmwares, there are many bugs. Thibor's HyperWRT v170905 has fixed these issues and incorporated some fantastic new features.

    You would have just as good luck using Avenger's 21b1 firmware.

    I have a two GS. One is running the old firmware, and one is running the new firmware, perhaps with better security. I don't know. Both work fine.

    One of the new Linksys bugs is additional trouble in authentication. Speedbooster clients are strongly affected by not receiving an IP address or working connection. This bug is related to the introduction of many new security features.

    May I suggest updating the drivers for the client's Linksys PCI card? Perhaps there is an update to cause Speedbooster to authenticate at long range? Maybe there is a driver offering that will allow disabling Speedbooster in favor of WIFI spec's longer range?

    You may also replace the PCI card with an $18-$25 RA-link (Foxconn, Gigabyte, Edimax, PCUSA) card.

    An upgrade antenna is a good idea, but never use dipoles (stick) on long-range clients unless they are part of a DS or WDS (multiple point of access) network.
    The Hawking Corner Reflect +15 has ideal characteristics for a client antenna, and you will "point" it at the access point. An economy panel antenna is also a fair solution.

    I noticed that you have a MIMO Super-G client running in a non-MIMO network. You may need to discover the Super-G settings and disable it, because it will be broadcasting non-understandable noise on the same channel as your network.
  4. howardp6

    howardp6 Network Guru Member

    If you disable SS-ID broadcast you will not be able to establish a connection, when using WPA-PSK, this is a known issue with Windows XP SP2. In addition, install the the WPA2 hotfix from the Microsoft website it has been known to fix some conectivity issues with WPA. If you are using WEP make certain you remove the hotfix.
  5. danielhaden

    danielhaden Network Guru Member

    That and speedbooster clients don't get completely connected to speedbooster routers at long range.
  6. HatTrick

    HatTrick Network Guru Member

    The issue seems to have been resolved. I changed from AES to TKIP and all works fine now.

    I had already installed the latest NIC drivers.
    I only get 18Mb/s but it is long range

    all other cliens work no problem on WPA-PSK with SSID broadcast disabled so no need to enable SSID broadcast.

    Thanks for the suggestions
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