automatic ad-hoc wireless connection?

Discussion in 'Wireless Networking' started by sobriquet, Feb 27, 2009.

  1. sobriquet

    sobriquet Guest

    Is it possible in xp and vista to create a kind of automatic ad-hoc
    network connection between two computers that each have a wireless
    adapter (usb) (for internet sharing)?
    Some computers are hooked up via a wired network to a modem, but there
    is one computer that is not easy to connect via a wire, so I'd like to
    connect it via a wireless connection, but preferably in a way that an
    ad-hoc network connection doesn't have to be made manually every time
    the internet is accessed.
    So the computer that is not physically connected to the internet can
    easily access the internet via the wireless connection and a shared
    internet connection on the other computer.
    sobriquet, Feb 27, 2009
    1. Advertisements

  2. Hi
    You mentioned few computers. That might imply that what you have is Router
    rather than plain modem.
    If you do have a Router you can give that two Wireless card a static IP and
    Bridge the Wireless connection.
    You do not need to use ICS if you Bridge.
    Jack (MS, MVP-Networking)
    Jack \(MVP-Networking\)., Feb 28, 2009
    1. Advertisements

  3. sobriquet

    sobriquet Guest

    It's a somewhat confusing situation. First there is the cablemodem,
    which provides the internet connection (PPPoE WAN connection). It goes
    to a switch (Sitecom Broadband 4P switch, DC-202 V2). Multiple
    computers are hooked up by ethernet cables to that switch and have
    access to internet. Some computers run under XP pro, others under

    What I'm not used to (PPPoE) is the way it is listed in the network
    When I plug-in an ethernet cable (connected to the switch), an
    internet connection icon appears among the network connections
    ('manage network connections' in vista), but there are very few
    options and there is no setting to share or bridge that internet

    The computershop advised to buy a wireless router (Linksys Wireless-G,
    WRT54GR v.1.1) and a wireless usb adapter.
    Simply plugging in the wireless router in the switch doesn't seem to
    work (it doesn't allow internet access via the wireless connection).
    I've tried configuring the wireless router to ensure it has PPPoE set
    as the connection type and specified the username and password, but
    that doesn't seem to help.
    Also, I can only log on to the wireless router (at to
    manage the settings, when I hook it up directly via ethernet to a
    When I try to log on to the wireless router via the sitecom switch, I
    somehow can't access it. The sitecom switch seems to use the address
    I can't assign any 192.168.0.X address to the wireless router manually
    (it won't accept 0 as the third value, only values between 1 and 255).

    Perhaps someone knows how to ensure that the current network setup
    remains working and what I need to do exactly to ensure that I can
    plug in the wireless router in the existing switch with minimal
    configuration changes to the wireless router in such a way that
    internet can be shared over the wireless network connection?

    Is there any site that explains in simple terms various ways to
    configure a home network with various routers, switches and modems
    (mixed wired and wireless connections), depending on how the router
    and switch are connected?

    Thx in advance for any suggestions, Niek
    sobriquet, Mar 4, 2009
  4. It is simple,...from the perspective of the PCs plugged into the Switch
    there is:

    1. No PPPoE
    2. No bridging
    3. No sharing

    ....and you don't want there to be.

    Only the "router" ever sees or is even aware of the PPPoE

    Only the "router" is doing the "connection sharing"

    Bridging does not apply, is completely irrelevant, and plays no part in
    anything that you are doing.

    If you want wireless there are two ways,....which are two entirely different
    concepts,...that should not be "blended" together, either one,...or the

    Choice #1:
    Replace the existing "router" with one that is capable of doing wireless
    and wired at the same time. That is it, is that simple,...sell the old
    wired "router" to someone, is now useless to you.

    Choice #2
    Buy a Wireless Access Point (WAP). This is NOT a "router" (even if it
    physically looks like one). Plug it into the Switch just as if it was
    another PC. Assign it a static IP# on the LAN. The IP# has only *one*
    purpose and that is to get into the Web-based Management Interface to
    configure the WAP,...the IP# has no other purpose. Configure your wireless
    PCs to connect to the WAP. Everything else is automatic from that point.

    Particularly if this is a home network,...follow what I said,...keep it
    simple, not turn the LAN into a Frankenstein Monster.

    I see no point in that nor any need for that at all. There is no point in
    even talking about that.

    Phillip Windell

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
    Phillip Windell, Mar 4, 2009
  5. sobriquet

    Lem Guest

    The probable reason for your difficulties is that the Sitecom DC-202 is
    not just a switch, it's a router. Although you *can* have a successful
    network with 2 routers, it's more complicated than necessary, and you
    don't need it.

    Thus, step 1 is to fully disconnect the Sitecom. Put it away somewhere
    for a time when you might need a few more hard-wired network connections.

    Step 2 is to connect your "cablemodem" to the "Internet" ("WLAN")
    connection of the WRT54GR. Connect one of your computers to the WRT54GR
    using an Ethernet cable and configure

    (a) the Basic Setup section with your PPPoE username and password and
    the "connect on demand" or "keep alive" options if desired (BTW, PPPoE
    usually applies to DSL connections, not to cable TV connections; I
    assume you were being imprecise when you referred to your modem as a

    (b) the Wireless section with a unique SSID (not your name or address)
    and encryption; choose WPA2(AES)-Personal if all of your other wireless
    hardware can support it, otherwise WPA-Personal (your router may have
    something called PSK2 which seems to be a Linksys version of WPA2; this
    may or may not be compatible with "real" WPA2); you may be able to use
    PSK2-mixed if some of your wireless hardware is older; do not use any
    "Enterprise" or "RADIUS" version of encryption.

    (c) the Administration section and change the password to access the
    router's configuration utility. I suggest writing this on a label and
    sticking it to the router.

    Your Linksys router has 4 LAN ports to which you can connect any of your
    computers. Your wireless computers will also connect, but through an
    "infrastructure" mode rather than "ad hoc."
    Lem -- MS-MVP

    To the moon and back with 2K words of RAM and 36K words of ROM.
    Lem, Mar 4, 2009
  6. sobriquet

    sobriquet Guest

    Thx for the tips (everyone participating in this thread).
    In addition to these remarks, I'd just like to note that I read in the
    installation/configuration information from the internet provider,
    that, in order to keep the current setup (that employs the sitecom
    router) and add the linksys router, they say that I should first
    connect to the linksys router to configure it and turn off DHCP
    (configuring other settings like security and PPPoE settings prior to
    that), in order to simply use it as a kind of extension of the current
    network (plugging in the linksys router in one of the lan sockets of
    the sitecom router).
    I couldn't find a manual online for the sitecom router, but I did find
    one in French for that model but a different version (v4 instead of
    v2), so I assume that manual still applies.
    I'd like to connect to the sitecom router first (via to
    see if there is anything I can infer from the current settings.
    I'm not very experienced with these things and this is the first time
    I'm attempting to add a wireless network connection to an existing lan
    network that involves a PPPoE internet connection, and hence I'm a bit
    wary to try and preserve the current network as much as possible, to
    ensure that I can always revert to the current situation that appears
    to be working properly.
    As the saying goes: "if it ain't broken, don't attempt to fix it".

    I'm not exactly sure if the sitecom device is a router or switch, but
    on the back it says both 'router' and 'switch': "Router - Broadband -
    4P Switch 10/100 Mbps".

    The linksys device does seem to be a wireless access point (or at
    least it is recognized as such by other wireless devices).
    sobriquet, Mar 5, 2009
  7. sobriquet

    Lem Guest

    Manual for Sitecom DC-202 Broadband xDSL/cable router w/4p Switch:

    Wireless routers such as the Linksys WRT54G are 3 devices in one box: a
    router; a wireless access point; and a 4-port switch. The Sitecom DC-202
    is 2 devices in one box: a router and a 4-port switch.

    The simplest solution is, as I said initially, to dispense with the
    Sitecom and replace it with the Linksys.

    If you don't want to do that, you can, indeed, use the Linksys solely as
    a wireless access point and 4-port switch by disabling and bypassing its
    router. Do this by disabling the DHCP server and by connecting a cable
    from one of the ports of the Sitecom router to one of the 4 LAN ports of
    the Linksys box. Leave the WAN port of the Linksys box unconnected. You
    also should set the *LAN-facing* IP address of the Linksys box to an
    address within the subnet (192.168.0.x) used by the Sitecom router but
    outside the range of IP addresses supplied by the Sitecom's DHCP server.

    See also

    Unless you need 2 extra wired LAN ports, there is no need to do this
    *unless* you do not know the details of the PPPoE connection already
    configured in the Sitecom. For a typical PPPoE connection, this would be
    a username and password. Although the password should be discernible
    from the Sitecom's configuration utility, the password may not display
    in the clear. If you don't know it, you'll have to get it from your ISP.

    Lem -- MS-MVP

    To the moon and back with 2K words of RAM and 36K words of ROM.
    Lem, Mar 6, 2009
  8. sobriquet

    sobriquet Guest

    sobriquet, Mar 6, 2009
  9. sobriquet

    sobriquet Guest

    I got it working, but my god what a friggin hassle.
    Since I didn't have a crosslinked cable to connect both routers, I
    simply replaced the sitecom router by the linksys router.
    It turned out that I didn't need the PPPoE settings (I could just
    leave it on DHCP) in the router.
    Still not entirely sure why it took hours of experimenting with the
    settings. Perhaps the internet connection was a bit dodgy and I
    mistakenly assumed that there was a problem with the settings of the
    sobriquet, Mar 6, 2009
  10. sobriquet

    Lem Guest

    I'm glad you got it working.

    I suspect that based on your posting IP (which shows as being located in
    Utrecht, NL) you are being directed to the Dutch version of the Sitecom
    home page. Try selecting UK from the drop down box and you should be
    able to find the manual.

    The fact that you were able to leave the Linksys router at its default
    (DHCP) setting for Internet access makes me think that the your initial
    description of the modem used to connect to your ISP was correct: you
    probably do have cable rather than DSL. But I have no idea how your
    Dutch ISP works.

    And you probably don't need a cross-over cable if you eventually want to
    use both devices. The Linksys certainly (and the Sitecom probably) has
    ports that automatically sense which type of cable is in use and
    configure themselves accordingly.

    Lem -- MS-MVP

    To the moon and back with 2K words of RAM and 36K words of ROM.
    Lem, Mar 6, 2009
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.