Bad latency with BT 512K ADSL

Discussion in 'Broadband' started by Gareth Jones, Apr 24, 2004.

  1. Gareth Jones

    Gareth Jones Guest

    Hi folks,

    I've done a quick google and checked back postings to this group, but
    can't find anything related to my question, so here goes:

    Someone I know has normal wired broadband and has BT as the ISP.
    When surfing, it just seems slow. I've done a couple of speed tests with
    different sites such as plusnet's test and and the
    download speed is fairly ok (can't remember exactly, but its >> 400Kbs

    Its almost as if sometimes there is a large latency (seconds) from when
    you click a link to the time that any response happens. Its never
    'zippy' or nearly instantaneous as with my Demon broadband.
    He was originally using the Bt supplied USB modem.
    I've now stuck in the same ethernet modem and netgear router that I have
    at home, but the delay is still there (he's even on a faster computer
    now as well!)

    Is it a slow BT DNS problem?? Does the BT web traffic go through some
    proxy that's not the quickest in the world??
    Is BT just really slow generally in this respect??

    Oh - he MAY be on a business tariff. Whether that makes any difference
    to what or how he connects via?

    Has anybody got any ideas/comments?


    Personal email for Gareth Jones can be sent to:
    'usenet4gareth' followed by an at symbol
    followed by 'uk2' followed by a dot
    followed by 'net'
    Gareth Jones, Apr 24, 2004
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  2. Gareth Jones

    Sunil Sood Guest

    Assuming its not a temporary problem..

    BT are migrating their customers to the BT Central Plus platorm (see and

    There have been some reports that customers have previously manually changed
    their MTU to 1458 (or something else), they may get poorer performance on
    this new platform than before.. therefore try setting teh MTU on the PC and
    router to the default setting..

    Sunil Sood, Apr 24, 2004
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  3. Gareth Jones

    Beck Guest

    First thing I would check for is spyware and browser hijackings. These can
    give the symptoms you are describing. There are a few downloads you can
    try. Adaware is quite popular, but I dont think catches hijackings. Also
    try Spybot Search and Destroy. This I think catches most nasty thigns
    including dodgy premium rate diallers.
    Also make sure your friend does some routine maintenance. Disk cleanup and
    defragmentation may help and should be performed on a regular basis. If he
    hasnt got the time to do them, they can be scheduled to run overnight.
    Beck, Apr 24, 2004
  4. Gareth Jones

    Brian Orpin Guest

    With PN I have found the DNS is the limitation so have a Linux Box
    running BIND as a caching DNS.

    Brian Orpin, Apr 24, 2004
  5. Gareth Jones

    Gareth Jones Guest

    Good suggestions, but I've done all that. In fact, I've just built him a
    new (fast) machine with a fresh install of everything.
    Its also slow on my centrino laptop (which is fine at home with me) when
    I've plugged that in.

    Sunil - he wouldn't have changed anything. Its been running using the
    default settings from day1.
    When I installed an Origo 8000 ethernet modem for him, I also just used
    the default settings - he didn't have any documentation giving any
    settings other than the login/password details.
    Might I have missed something somewhere?
    Do you need to configure IE to use a specific proxy server etc??

    But the original install would no doubt have been via a standard BT
    installation CD and the problem was there then ......

    Note - if he is on a business tariff - I've only ever checked it in the
    middle of a weekday. Any chance its just the BT system being loaded at
    that time??

    Personal email for Gareth Jones can be sent to:
    'usenet4gareth' followed by an at symbol
    followed by 'uk2' followed by a dot
    followed by 'net'
    Gareth Jones, Apr 24, 2004
  6. Gareth Jones

    Sunil Sood Guest

    I haven't been a BT ADSL customer for a while but they don't use any proxy
    servers/cache's or anything like that..
    I woudn't have thought contention plays a big part in the problem but you
    can also try to help rule out

    Given that it doesn't appear the problem is with the PC (as you can
    replicate it on your laptop) - can you try plugging in the USB modem,
    instead of the router , to rule that out as well and see if the issue still

    If it does, its certainly worth him logging the issue so their tech support
    people can have a look - making sure he explains that he has tried multiple
    modems/PC's etc..

    Sunil Sood, Apr 24, 2004
  7. Gareth Jones

    Sunil Sood Guest

    Meant to add - also try setting another ISP's DNS servers temporally as well
    though I don't think its a DNS issue you never know.

    Sunil Sood, Apr 24, 2004
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