cable modem issue

cable modem issue
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Subject Author Date
cable modem issue DJ Majestik 05-31-2005
Posted by DJ Majestik on May 31, 2005, 6:35 am
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Was wondering if anyone came across a similar issue. I have a cable
modem hooked up to a wireless router, and serve the connection out to
multiple machines. This has worked great for about 3 months.

Recently, I noticed that it would drop the connection about once a day.
I would reset the modem (physically unplug/replug back in) and all
would be fine. It started happening about 3-4 times a day, now it is
happening all the time.

I have WEP security on the wireless, and can access my LAN just fine,
just can't connect on any computer out to the internet until I reset my
modem.

Both machines are using wireless NICs, any ideas in how to
troubleshoot/fix the problem? It is kinda frustrating to have to reset
about every half hour.

Could it be a problem with Time Warner? My wireless Linksys router? I
don't think it has to do with the computers, because both are
experiencing the same problem.

Thanks for any help you can provide,
JJ



Pure Networks
Posted by BigJim on May 31, 2005, 1:04 pm
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you could try changing channels.
> Was wondering if anyone came across a similar issue. I have a cable
> modem hooked up to a wireless router, and serve the connection out to
> multiple machines. This has worked great for about 3 months.
>
> Recently, I noticed that it would drop the connection about once a day.
> I would reset the modem (physically unplug/replug back in) and all
> would be fine. It started happening about 3-4 times a day, now it is
> happening all the time.
>
> I have WEP security on the wireless, and can access my LAN just fine,
> just can't connect on any computer out to the internet until I reset my
> modem.
>
> Both machines are using wireless NICs, any ideas in how to
> troubleshoot/fix the problem? It is kinda frustrating to have to reset
> about every half hour.
>
> Could it be a problem with Time Warner? My wireless Linksys router? I
> don't think it has to do with the computers, because both are
> experiencing the same problem.
>
> Thanks for any help you can provide,
> JJ
>




Posted by speeder on May 31, 2005, 6:44 pm
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wrote:

>Was wondering if anyone came across a similar issue. I have a cable
>modem hooked up to a wireless router, and serve the connection out to
>multiple machines. This has worked great for about 3 months.
>
>Recently, I noticed that it would drop the connection about once a day.
>I would reset the modem (physically unplug/replug back in) and all
>would be fine. It started happening about 3-4 times a day, now it is
>happening all the time.
>
>I have WEP security on the wireless, and can access my LAN just fine,
>just can't connect on any computer out to the internet until I reset my
>modem.
>
>Both machines are using wireless NICs, any ideas in how to
>troubleshoot/fix the problem? It is kinda frustrating to have to reset
>about every half hour.
>
>Could it be a problem with Time Warner? My wireless Linksys router? I
>don't think it has to do with the computers, because both are
>experiencing the same problem.
>
>Thanks for any help you can provide,
>JJ

Cable modems in particular will commonly use DHCP to assign you with
an IP address. This is leased for a set period of time (usually a
couple of hours) when it is automatically renewed by your cable modem.
If it fails to renew the IP, your connection drops. A possibility is
that a software firewall or other security application is getting in
the way and blocking this renewal. Check your logs for blocking of
ports 67 or 68 or blocking of IPs 255.255.255.255 or maybe in the
10.x.x.x range (do a trace route to www.yahoo.com and see the IP of
the first hop). Your ISPs DHCP server might be being blocked as well
(ask your ISP for the IP).

Another possibility is that you are being targeted by a DoS attack. A
DoS attack can disrupt your cable modem and/or your router. Check your
routers log.

A third possibility is some problem with the signal your ISP is
providing you. You could have them make a physical and local
inspection on the cables that lead to your modem.

good luck!


Posted by James Knott on May 31, 2005, 8:34 pm
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speeder wrote:

> Cable modems in particular will commonly use DHCP to assign you with
> an IP address. This is leased for a set period of time (usually a
> couple of hours) when it is automatically renewed by your cable modem.

With my cable ISP, the lease time is one week. The IP is virtually static
and I've also got a consistent host name, so even if the IP changes, I can
still use the host name to get the new address.




Posted by speeder on June 1, 2005, 12:25 am
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On Tue, 31 May 2005 20:34:23 -0400, James Knott

>speeder wrote:
>
>> Cable modems in particular will commonly use DHCP to assign you with
>> an IP address. This is leased for a set period of time (usually a
>> couple of hours) when it is automatically renewed by your cable modem.
>
>With my cable ISP, the lease time is one week. The IP is virtually static
>and I've also got a consistent host name, so even if the IP changes, I can
>still use the host name to get the new address.
>

The funny thing with cable is that even though the lease time could be
as short as I mentioned, it usually gets the same IP as before. So it
is possible to keep the same IP for months even though it is being
dynamically regenerated.

Cable networks can often have static IPs too (I´m not sure how DHCP
works in that scenario, if at all). So I guess it is up to the ISP to
define how this going to be done.

I guess my post suggested all cable networks work the same way but
this is far from the truth.


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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