OT: Comcast cable woes

Discussion in 'PC Hardware' started by Dave C., May 15, 2004.

  1. Dave C.

    Dave C. Guest

    I know this is OT for here, but this is where all the really smart techie
    types hang out, so I figure I've got as much chance of finding help in this
    ng as anywhere else.

    Several months ago, I
    switched to comcast cable modem for high speed Internet service. It works
    OK, but slows down at night. I can live with that. But it's got another
    problem that's really annoying. Every once in a while (once a day,
    usually), my Internet connection dies. Define "dies", you say? Well. . .
    (Motorola SB5100 cable modem)
    - Four steady green lights, one flashing orange "pc/activity" light
    - Can not load ANY web page
    - No error message
    - Sometimes web pages start to load (I'll get some graphics near the top),
    but never finish
    - unplugging modem and rebooting computer has no effect
    - releasing and renewing IP has no effect
    - While web pages are not loading, tech support can successfully ping my
    modem (so they claim anyway)
    - If I try to tracert any major domain, the tracert times out, but only
    after several "hops"
    - 25% or greater packet loss on ping to any major domain
    - Cable tech has been out twice, says signal strength (both ways) is good

    Some more information that may or may not be helpful (probably not):

    The system is a AMD XP2500 homebuilt with an Epox brand nforce2 chipset
    motherboard using 100 speed ethernet built into mainboard. It's running XP
    Pro SP1 with all updates as an OS with 1GIG of RAM. I've noticed the same
    problem if I hook up a laptop to the cable modem, so I don't think it's my
    computer. I run Tiny Personal Firewall, but killing that doesn't help. For
    a while, I had a Zyxel Prestige 314 (aka Netgear 314) router in the mix.
    But taking the router out didn't change anything.

    The Motorola SB5100 modem is leased from Comcast, and was brand new when
    they first hooked it up. I am now on Earthlink Cable modem service
    (Earthlink through Comcast). So my IP is different, but the symptom is the

    Has anyone experienced similar problems? If so, what did you do to get it
    fixed? -Dave
    Dave C., May 15, 2004
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  2. Dave C.

    jpsga Guest

    I have been delighted with ComCast and am sorry you don't share the joy.
    Could you ask them to swat out your cable modem? Since it is a lease and
    potentially their problem.
    DSLReports.com has a nice tool for looking at your TCP/IP setting
    etal.Worth the trip.

    jpsga, May 15, 2004
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  3. Dave C.

    Dave C. Guest

    Hey, good catch. According to the manual, it does have a reset button. I
    doubt if it will help, considering how many times I've killed power to the
    thing. However, at this point, I'm willing to try anything. -Dave
    Dave C., May 15, 2004
  4. I"m also on comcast, and did have issues every couple of days... exactly as
    described, everythign just times out. Every now and then I had success by
    pushing the standby button on front of modem, then pushing it again after a
    few seconds... don't know how it worked, but it did. Still have problems
    every week or so, but not as often as it was. Leads me to think its CableCo
    side network issues not local issues. In our area comcast is killing all
    analog signals, forcing everyone to digital (we already were), and since
    they killed analog to our local loop i haven't seen as many mysterious
    "downages". Just dawned on me to check out my model number... its a
    Motorolla SB4100 modem, so yours may or may not have the standby button.
    As much as i hate to have it go down now and then, its far more reliable
    than ANY dial up service i've used....
    nooneimportant, May 16, 2004
  5. Dave C.

    feroce Guest

    I had pretty much the same problem. Turns out that the cable modem was
    faulty. Try swapping in a different modem and see if that helps.
    Also, buy your own modem. It's a lot cheaper in the long run...

    feroce, May 16, 2004
  6. Dave C.

    Dave C. Guest


    Thanks for all the great information. Now I'm just waiting for the
    connection to die again so I can run some more tests on it. -Dave
    Dave C., May 16, 2004
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