HELP - can reach ISP through cable, not through wireless ?

Discussion in 'Wireless Internet' started by Bob Newheart, Jul 31, 2005.

  1. Bob Newheart

    Bob Newheart Guest

    Hi all,

    I have a the following setup:

    [ADSLmodem] ---[router]---[wireless router as AP]---[laptop w wireless
    PCMCIA card]

    When I connect the laptop through cable to the AP I can access internet
    fine, when I connect through wireless I can only access the maintenance
    pages of the two routers but I cannot access internet. Likewise I cannot
    ping the ISP when connected through wireless, this works fine when connected
    through cable.
    The signal is 100%, all in the green etc.

    Any ideas howcome I cannot get beyond the [router] to the ISP when connected
    thru wireless?

    Many thanks,



    ADSLmodem - Alcatel Speedtouch Home
    router - Sitecom something w. parallel printer server, crap but works.
    wireless router as AP - USRobotics 8054, DHCP off, connected to router with
    cross cable WAN to WAN
    laptop running W98
    wireless PCMCIA card USrobotics 805410

    IP's of home network are all in range,
    firmware, drivers and utilities of routers and PCMCIA card are the latest
    Bob Newheart, Jul 31, 2005
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  2. 1. Dive into the Sitecom and turn off MAC address filtering.

    2. Do you have a default gateway assigned on the wireless client?
    If Windoze W2K or XP, try:
    start -> run -> cmd <enter>
    The default gateway displayed needs to be the IP address of the
    Sitecom router. My guess is that it's either or some other
    value left over from a previous wireless exercise.

    3. Try refreshing DHCP with:
    ipconfig /release
    (wait about 10 seconds)
    ipconfig /renew
    ipconfig (see if you get a decent IP and gateway)
    If it hangs, your Sitecom DHCP server setup is probably screwed up, or
    your DHCP client on the laptop has a problem or is disabled.
    Jeff Liebermann, Aug 1, 2005
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  3. Bob Newheart

    Bob Newheart Guest

    Jeff, thanks for replying.

    Indeed - this is where the problem was. When I did a ipconfig /all I saw the
    default gateway on the laptop (wireless client) was set to the address of
    the wireless router, not the Sitecom router. I had to force this in the
    wireless card's tcp/ip settings - although DHCP on the wireless router was
    there was no way to convince the wireless client to get settings
    automatically from DHCP on the Sitecom. I found this interesting because
    when I connect the same client to the same (wireless) router with a
    cable/network card instead of a wirelecc PC card, the client gets the
    settings from the Ditecom DHCP without a hitch.
    At any rate, this made the ISP's IP address pingable, and manually setting
    the DNS servers in the wireless PC card's tcp/ip settings, internet started
    to work as well.

    All's well that ends well. Now catch

    e on the laptop (wireless client) was set to the ip of the wireless router,
    not the sitecom router. I fixed that (had to set it manually, couldn't get
    wireless to get it from the DHCP on the Sitecom (strange, a wireless
    connection to the USR router doesn't connect to DHCP on Sitecom while a
    cabled connection to the same USR router does.)

    Now I can ping the ISP fine. However, still cannot surf the net

    This one was right on - the default gateway had the address of the wireless
    router instead of the Sitecom, must somehow be set through the wireless side
    of things even if DHCP on the wireless router is turned off. It's
    counter-intuitive as a cable connection through the same wireless router has
    a different result but hey, this is the weird world of wireless.
    Bob Newheart, Aug 1, 2005
  4. Nope. You have the DHCP server turned on in both the Sitecom router
    and the USR 8054. There should only be one DHCP server on your LAN.
    Turn *OFF* the DHCP server in the USR router/access-point and all will
    work as expected.

    There are about 5 of my posting in this newsgroup, that explains how
    to convert a wireless router into an access point. Step #2 is always
    to disable the DHCP server in the wireless router.

    # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
    # 831.336.2558 voice
    # AE6KS
    Jeff Liebermann, Aug 2, 2005
  5. Bob Newheart

    Bob Newheart Guest

    Sorry Jeff, I posted my previous message too early by accident and sent a
    fixed one. This morning I notice that it never got to the server.
    I also see that I missed one word in the sentence below:

    and that was the word "off". During all this testing the DHCP server in the
    wireless router was off.
    You see, when I connect the same client to the wireless router through a
    cable/network card instead of a wireless card all goes well. The client then
    gets all settings automatically from the sitecom router. The wireless router
    indeed then works nicely as AP. For some reason I need to manually assign
    everything when going wireless on this router.

    I will search for and read your posts on converting a wireless router into
    an AP tonight. In the mean time I have a working setup.

    Many thanks again,

    Bob Newheart, Aug 2, 2005
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