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Posted by Quaoar on November 13, 2006, 7:46 pm
Trogdor wrote:
> Hello, I just registered here, as I found this particular thread
> through google. I really hate to bump a thread that's 2 years old,
> but I am having the *exact* same problem as this guy described. This
> issue has happened three times in the past oh 6-9 months or so, and
> when it happens it's seemingly impossible to stop and lasts for
> weeks/months. It's driving me insane. I'm very close to taking this
> modem out Office Space-style. I'm willing to provide any information
> needed as well as follow any instructions you provide until my
> problem is fixed. Thanks in advance.
>
>
> Here's what I'm working with:
>
> SB5100 modem straight to computer (I was using a router but I got
> tired of having to power cycle it every day to restore my ip - when
> the modem can't renew the ip, the router drops all wan information).
>
> My connection drops for about 15-30 seconds, every hour like
> clockwork. My windows event viewer shows this under system every time
> it happens:
>
> "The IP address lease [my ip] for the Network Card with network
> address [my nic mac] has been denied by the DHCP server [comcast's
> dhcp server ip] (The DHCP Server sent a DHCPNACK message)."
>
> My windows dhcp lease time, according to ipconfig /all is 2 hours. My
> modem apparently likes to check every hour. I cannot modify dhcp
> lease time in my modem's config page (192.168.100.1). In fact, the
> only things I can manually do in my modem's config are "reset
> all defaults" and "restart cable modem" (I've yet to
> use either as I just found the config page but I'm very tempted to
> reset all defaults).
>
> Every so often (lately about once a day) when my modem tries to renew
> the ip, it stays in this ip-less state until I power cycle it.
>
>
> These problems always start when something happens and my modem loses
> all signal (i.e. becomes untrained). When it comes back online, I get
> disconnected 60 minutes later, and so on, and so forth.
>
> The first time it happened, after a few weeks, I reconnected my router
> which I had stopped using, and the router seemingly took care of the
> problem until it went away on its own.
>
> The second time it happened, I waited a couple weeks before calling
> comcast tech support. The tech support guy sent my modem a reset
> signal and instructed me to use the 'repair' button under my 'local
> area connection status' dialog's 'support' tab. Problem solved.
>
> The third and current time it happened, I didn't hesitate to call
> comcast and have them send my modem a reset signal. 60 minutes later
> I was still connected without getting dropped. The success was
> short-lived though, as 60 minutes after that the problem started
> again.
>
>
> I use a third-party firewall. It doesn't matter whether or not it's
> running, the problem happens anyway. I also also use norton
> antivirus, with automatic updates and weekly scans. My computer is
> very clean and as secure as the firewall permits.
>
>
>
> Please help me, I am extremely frustrated with this. Comcast tech
> support seems to think it's my computer causing the problem as I have
> a very good signal and my modem stays trained, but knowing what I
> know, I *highly* doubt it.
>
> My next obvious courses of action if I can't fix this are to get a new
> modem (I can rent one for fairly cheap but I really don't want to),
> and to have a technician come out if the problem truly is on
> comcast's end.
>
>
> Thanks,
> Trogdor
>
From you browser, enter 192.168.100.1 to load the modem information
page. Access the Signals page and post back the downstream and upstream
signal levels in dBmv and the signal-to-noise ratios, if available.
Q
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