Goal: Connect two buildings with wireless

Discussion in 'Networking Issues' started by nethole, Feb 18, 2006.

  1. nethole

    nethole Network Guru Member

    I'm roughly 1000-1200 ft away from the next building, I'm on a hill, and there are trees. I need to get the internet access from the next building. Here's my current plan, please suggest improvements/changes.

    I have a WRT54GS (CGN3, so version 2). My intention is to put this in the next building with internet access. The intent is to get appropriate coax from the WRT54GS to the roof, and mount either a YAGI, or 15 db parabolic antenna, and point it towards 'me' (the second location).

    Now, this is where I have questions.

    At the second location, what linksys box should I get? Can I
    buy another WRT54GS, and put on new firmware to make it act as
    a bridge? or should I specifically buy a WAP instead?

    The intent is to also put a YAGI or 15 db parabolic antenna at
    the second location and point it at the first antenna (at the place with internet access).

    I recognize that I don't have unobstructed line of sight, there are trees, so what else do I can/should I do?

    ---Hills of Virginia
  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    You need to get a point that's going to give you the clearest line of sight as possible. Also keep in mind the "Fresnel Zone" which is the further you shoot the signal, the wider and more scattered it becomes, unless you transmitting with a high powered antennae to keep everything tight.

    It's best to get a router that supports WDS right out of the box (look at either Belkin or SMC). Then again, you can always flash pre version WRT54G V5 routers with Hyperwrt, Openwrt, DD-WRT, or Sveasoft. Personally, I'd just flash a router with the firmware because I could always swap in and out should I need it to be a router on occasion, then an access point on another.

  3. nethole

    nethole Network Guru Member

    Ok, DD-WRT V23 chosen

    I'm still back to the question of what antennas should be used.

    There is NO clear line of site, there are trees. Which antennas
    should be used in this case? yagi, parabolic? or the alternative helix style rods?

  4. dsr70

    dsr70 Network Guru Member

    A single 15db gain yagi at the the receiving end should work fine. This assuming the LOS blockage isn't too great. A dish is heavy artillery that you shouldn't need for such a short distance. Of course a 15db dish is no better than a 15db yagi, but it's possible to go higher gain with dishes.

    But with a really bad LOS, I'd look for a way to string ethernet to a remotely located WRT with better LOS. I'd run two WRTs in bridge mode. At the sending location I'd stick the WRT on the roof and eliminate the expensive low loss wire to the antenna.

  5. nethole

    nethole Network Guru Member

    'Bridge mode' question

    I'm using the dd-WRT (v23) firmware. and as of yesterday, I've had
    a devil of a time having my '2nd wrt' talk properly to the first.

    I'ver read the linksys info faq that describes WDS, but the items listed in the faq don't seem sufficient. I believe I've copied the network configurations exactly. It required many times reconfiguring my PC to give it a static IP due to rebooting the WRT with changing addresses, and the apparent inability for the PC connected to the 2nd WRT to get an address from the first WRT's DHCP server.

    I'm looking for help on this issue, as typing 'bridge' into the search function returns 1122 (roughly) hits.
  6. nethole

    nethole Network Guru Member

    Bridge problem resolved

    The mac address changed (or I miss read it by one) for one of the WRTs. After changing the MAC address in WDS and rebooting both boxes, the behavior is as expected (bridging accomplished).

    Now, I'm back to determining Antenna and mounting locations, given
    tree cover, and inability to mount the WRTs outside
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