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connecting wrt54g at long distance

Discussion in 'Cisco/Linksys Wireless Routers' started by Anonymous, Sep 20, 2005.

  1. Anonymous

    Anonymous Guest

    i'm connecting 3 unit WRT54G with ddwrt firmware and wds like this:

    PC1 --- A===== B===C --- PC2

    A-B is 6 km connected using 24db hyperlink grid antena
    signal is good with rssi about -60 to -70

    B is setup as wds/repeater

    B-C is about 1km
    C using 14db flat panel
    signal also good with rssi about -70

    ping from PC1 to PC2 is good

    problem arise when we put some load to the network.
    such as, downloading few files from PC1 to PC2 or vice versa
    as downloads occurs, ping get worse. lots of time out.
    and the transfer also not so good.
    many failure when transfering files.

    is there a way we can make better connection?

    what's the configuration best for long distance connection like this?


    t.i.a.
    rex
     
  2. hchady

    hchady Network Guru Member

    what ddwrt version are you using ?

    the link B-C is also wds ? if your are using only 1 PC you can set C as client ou client-bridged. in this case B repeater works beter

    anyway what is the range of your ping time ? and transfert speed between PC1 and PC2.
    try to ping from pc1, the wrt A, B, and C, and do the same with PC2.
    I guess that you have some problems between wrt B and C
     
  3. Anonymous

    Anonymous Guest

    i'm using released ddwrt 22r2.
    o yes i forgot, all wrt is set as wds.

    problem with client mode is that i have to give it different ip/subnet.
    i want pc1 and pc2 at the same subnet.
    eventually, pc1 and pc2 will be lan1 and lan2 each with a dozen pc.

    ping time from pc1 to pc2 is around 10-50ms, when no other connections.
    get few time out (maybe 1 rto of 20 good pings)

    when i start transfering few files, the ping drops to hundreds and lots of time out.
    cant figure the speed. the connection is too bad. copying few kb files seems to takes forever...

    all other pings seem ok. about 10-50ms.

    cant do much things with B. it's completely wireless and above 50m tower.


    anyone successfull experiences get a good connection on a long range?

    tnx&rgds,
    rex
     
  4. Anonymous

    Anonymous Guest

    i tested it again,
    transfer about 8 meg files, it takes about 8 minutes.

    what performance to expect for this kind of connection?
     
  5. Anonymous

    Anonymous Guest

    could i get any better result with wrt54gs?
    or booster? (currently i set at 251mw)
    or set it at b mode only? or g mode only?
    or set at fixed rate 2mbps?

    or combination of them?


    tia.
     
  6. Anonymous

    Anonymous Guest

    I have similar setup :
    WRT54G -------11.5km-------WRT54G-------12km---------WRT54G

    ddwrt v22 final
    All using wds, 24dbi grids
    Speeds 120KB/s
    0% packet loss
    rssi -65
    Forcing 1mb
    b only
    100mw - this is very important ! Go higher and noise increases !
     
  7. Anonymous

    Anonymous Guest

    tried that settings.
    100mw too low can get good signal.
    so i set 150mw. b only, 1mbps
    rssi -73.

    still got quite some rto.
    especially with some data transfers...
     
  8. Anonymous

    Anonymous Guest

    btw. I get the same thing while trasferring files across the link eg, packet loss and high pings this I think is quite normal.
     
  9. hchady

    hchady Network Guru Member

    which channel are you using? I recommend channel 1.
    try to set DTIM intervall to 3 on all routers and boost the power to 200mW
     
  10. Anonymous

    Anonymous Guest

    tried different channels.
    i see many channels used already.
    finaly, i choose ch 14 which very rarely can be used by others.

    tried DTIM 5
    what is this actually? does it really make a different?

    the power tried 251 before.
    then someone above there told me to bring down to 100.
    now i'm told to bring up to 200?

    actually with 150mw power, the point C gets lower signal
    and not as stabil like before (251mw)


    any other suggestion?
    tnx.
     
  11. Anonymous

    Anonymous Guest

    i hate to sound like an idiot, but how is it possible to go 12 km with the WRT54G, and is it in a radius, or more of a concentrated line? I didnt think that the units were powerful enough to go more than a hundred meters or so. I currently have 2 wrts in wds mode and the power at 150mw just to get a good strong signal in my back yard. I'm just curious, any information about it would be appreciated.
     
  12. jaysun

    jaysun Network Guru Member

    hate to sound like an idiot, but how is it possible to go 12 km with the WRT54G, and is it in a radius, or more of a concentrated line? I didnt think that the units were powerful enough to go more than a hundred meters or so. I currently have 2 wrts in wds mode and the power at 150mw just to get a good strong signal in my back yard. I'm just curious, any information about it would be appreciated. sorry about the repost, but for some reason it logged me out prior to posting it originally.
     
  13. Anonymous

    Anonymous Guest

    if signal is the problem,
    good antenna is the answer.
    as simple as that.

    but now that i got a pretty good signal,
    problem is why the data connection is not as good?
     
  14. hchady

    hchady Network Guru Member

    you can feel free to boost your power to 251 with directionnal antenna, i have sometime the same ping problem with WDS and I believe that wrts cannot maintain a stable wds connections, i don't know the reason
     
  15. Anonymous

    Anonymous Guest

    fools of me...

    this is still same old problem happened to me not too long ago...

    http://wl500g.info/showthread.php?t=2515
    http://forum.bsr-clan.de/ftopic1305.html


    imho,
    iplimit patch for netfilter is definitely most usefull in these situations.
    as with open/public hotspot, we cant inspect every computers that connects to our network.

    so, please, firmware developers,
    make this into 'todo' list.

    tnx&rgds,
    rex
     
  16. Anonymous

    Anonymous Guest

  17. bingo

    bingo Guest

    Jaysun - 12km is really not that much, all you need is LOS and good directional antenna. I make the link with the standard 28mw setting although speeds drop to 40KB/s.
    Antenna cable lenghts are kept to a minimum.

    See : http://www.jawug.za.net/attachments/bingo
     

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