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Modem Sometimes not Working


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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 02:13 AM #1
Modem Sometimes not Working
I live in a small town with Cox Communications as my ISP. If you are looking for an ISP by the way, avoid Cox at all cost. Nevertheless, I am having this issue: When I connect my modem to my computer directly, and I go to reset via browser, it works. Then I go to plug it back into my router and it ceases to function. It seems as long as I can reset it using my computer that it is okay and functional. I have tried connecting to two different routers who have both worked in the past. If it makes any difference, I have just bought a new router and modem that is significantly more powerful than my last ones and within the same day these issues started. I have already had my ISP out here and they have "fixed" it once. When you go to do the diagnostics on Windows 7 it tells me "DNS server is not responding." I have also tried on my XP computer to use the command "ipconfig/renew" and it fails. This is seriously flustering me and I am in the middle of writing a documentary so I need my internet connection to collaborate with my partners. Any advice would be much appreciated. Thank you.
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etaf   (Wayne) etaf is offline
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02-Jan-2012, 04:42 AM #2
I assume its not a requirement for MAC address cloning - some ISP will make use of the unique MAC ID on devices to use like a password
As you have had a couple of routers working, I suspect thats not the case - although changing the modem may be an issue

So ignoring the above for the moment

lets see a ipconfig /all when it is connected directly to a modem and working
then when its connected to the router can we see another ipconfig /all and three ping tests

Whats the make and model of the Modem and the Routers

Try setting up an Open DNS server - google for example - see details below

------------------------------------------------------------------------
ipconfig /all
If you cannot access the internet with this PC, then you will need to paste the results into something like notepad and then copy onto a machine that can access the internet and post results here

We would like to see the results from ipconfig /all post back the results in a reply here

Hold the Windows key and press R, then type CMD then press Enter to open a command prompt box (A new dialogue box - black with white font, will appear on screen ):

In the command prompt window that opens, type the following command:

Note that there is a space before the /ALL, but there is NOT a space after the / in the following command.

ipconfig /all > network.txt & network.txt

It will export the results to notepad and then automatically open notepad.

Now all you need to do is copy and paste those results to a reply here
to do that:
From the notepad menu - choose Edit - Select all
all the text will be highlighted
Next
From the notepad menu - choose Edit - Copy
Now go back to the forum - reply and then right click in the reply box and paste
------------------------------------------------------------------------

------------------------------------------------------------------------
Ping Tests
If you cannot access the internet with this PC, then you will need to paste the results into something like notepad and then copy onto a machine that can access the internet and post results here
Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and paste here.

Start> Run {search bar in Vista/W7}> CMD to open a DOS window and type:

Type the following command
Ping {plus the number thats shown against the default gateway shown in above ipconfig /all}
Post back the results
rightclick in the box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Type the following command
Ping google.com
Post back the results
rightclick in the box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Type the following command
Ping 209.183.226.152
post back results
rightclick in the box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste
Quote:
For your information only
these tests will check various stages of the connection, the first ping test, ping default gateway checks to see if you still have a connection to the router the next two
Ping google.com & Ping 209.183.226.152 tests the connection to internet , one by name and one by number which checks that the dns is working

------------------------------------------------------------------------
------------------------------------------------------------------------

Google public DNS

Google public DNS
http://code.google.com/speed/public-dns/

Theres also a link on how to setup those DNS IP address
http://code.google.com/speed/public-dns/docs/using.html

------------------------------------------------------------------------
__________________
Wayne
Please let us know what the final solution was to any problem posted
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 10:48 AM #3
Thank you for the quick response. Here are the results for everything: C:\Users\owner>ping google.com

Pinging google.com [74.125.227.80] with 32 bytes of data:
Reply from 74.125.227.80: bytes=32 time=29ms TTL=56
Reply from 74.125.227.80: bytes=32 time=31ms TTL=56
Reply from 74.125.227.80: bytes=32 time=30ms TTL=56
Reply from 74.125.227.80: bytes=32 time=29ms TTL=56

Ping statistics for 74.125.227.80:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 29ms, Maximum = 31ms, Average = 29ms
--------------------------------------------------------------------------------------------------------------------------

C:\Users\owner>ping 172.19.121.25

Pinging 172.19.121.25 with 32 bytes of data:
Reply from 172.19.121.25: bytes=32 time=17ms TTL=59
Reply from 172.19.121.25: bytes=32 time=19ms TTL=59
Reply from 172.19.121.25: bytes=32 time=18ms TTL=59
Reply from 172.19.121.25: bytes=32 time=16ms TTL=59

Ping statistics for 172.19.121.25:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 16ms, Maximum = 19ms, Average = 17ms
------------------------------------------------------------------------------------------------------------------------------------------------------

Results for IPCONFIG /ALL

Host Name . . . . . . . . . . . . : owner-HP
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : ks.cox.net

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 70-F1-A1-E7-0B-DD
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : ks.cox.net
Description . . . . . . . . . . . : Realtek PCIe FE Family Controller
Physical Address. . . . . . . . . : 78-E7-D1-CC-AE-4E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::9de4:95ec:8252:aa7c%12(Preferred)
IPv4 Address. . . . . . . . . . . : 70.178.249.119(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, January 02, 2012 8:34:11 AM
Lease Expires . . . . . . . . . . : Tuesday, January 03, 2012 8:34:10 AM
Default Gateway . . . . . . . . . : 70.178.249.1
DHCP Server . . . . . . . . . . . : 172.19.121.25
DHCPv6 IAID . . . . . . . . . . . : 315917668
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-E5-1D-34-D4-85-64-0D-CC-29

DNS Servers . . . . . . . . . . . : fe80::224e:7fff:fe22:1d73%12
68.105.28.11
68.105.29.11
68.105.28.12
NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 802.11n Wireless LAN Card
Physical Address. . . . . . . . . : 70-F1-A1-E7-0B-DC
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{57A59533-54F3-49BD-BCD9-BD4296123231}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:20d1:2ec0:b94d:688(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::20d1:2ec0:b94d:688%10(Preferred)
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.ks.cox.net:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : ks.cox.net
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter 6TO4 Adapter:

Connection-specific DNS Suffix . : ks.cox.net
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:46b2:f977::46b2:f977(Preferred)
Default Gateway . . . . . . . . . : 2002:c058:6301::c058:6301
DNS Servers . . . . . . . . . . . : fe80::224e:7fff:fe22:1d73%12
68.105.28.11
68.105.29.11
68.105.28.12
NetBIOS over Tcpip. . . . . . . . : Disabled

Thanks again.
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 11:23 AM #4
I called Cox this morning and they had me power cycle and yadayada. Cox sold it off as "Moodiness" between the router and modem. Which I find rather bizarre. Basically what it came down to was I had to plug back in my router before my modem or they wouldn't communicate. This seems like we are just creating a bridge over the problem here. I would really like to fix it so I it is like normal. As of now though it is up.
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02-Jan-2012, 12:19 PM #5
Many times you can tell if the ISP is having problems by viewing the modem status pages. This can be accessed on many cable modems typing 192.168.100.1 into your web browser address bar. If it asks for a password, try icu4at!

Look for downstream power near 0 dBmV, signal to noise ratio less than 30 dB, upstream power more than 55 dBmV, and DHCP errors when your connection isn't working.
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 12:31 PM #6
I'm not too seasoned with modem configuration so you'll have to hold my hand a little bit. What I found says: Upstream channel ID = 4
Frequency (hz) = 819000000
DCHP Server = Enabled
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 12:33 PM #7
My signal to noise ratio is 35.9 and my power level is 5.2 for downstream
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02-Jan-2012, 12:36 PM #8
Those look fine for when it is working.
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 12:48 PM #9
Is there any reason I would have to plug in my router before my modem? It seems like something is wrong there.
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etaf   (Wayne) etaf is offline
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02-Jan-2012, 02:32 PM #10
Quote:
Basically what it came down to was I had to plug back in my router before my modem or they wouldn't communicate.
dont understand that

so the ipconfig /all you posted above was with the Computer connected directly to the modem

now when you connect the modem to the router , and PC to router can we see an ipconfig /all

make and model of the modem and of the router
exact details of how connected and what ports you are using
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 03:05 PM #11
Support told me that when power cycling my router and modem that I needed to start my router up before my modem. They told me "For some reason or another your setup is backwards. When you power cycle you need to start your router before your modem." I suppose that works but I would really like it to be set up normally. Also I am away from home at the moment so I will post the new ipconfig /all results when I can.
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02-Jan-2012, 03:13 PM #12
That doesn't make sense to me, maybe a Cox Cable thing. When my router is acting up I power cycle it, leaving my modem on.
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 03:17 PM #13
That was my logic as well. I'm glad I'm not the only one who thinks this is just bizarre.
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etaf   (Wayne) etaf is offline
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02-Jan-2012, 03:49 PM #14
strange - I normally make this suggestion - so unless something unique with cox cable

------------------------------------------------------------------------

How to power cycle

“power cycle” process to reboot or reset the modem/router
  • Switch off all the devices modem, router and computers also unplug their power cables.
  • Wait at least 30 seconds.
  • Plug the power cords back in, but don’t switch them on.
  • First turn on the modem and then wait for a few minutes for it to settle and all the lights to become stable.
  • Next switch on the router (if a seperate device ) and then wait for a few minutes for it to settle and all the lights to become stable.
  • Now turn on your computer, You should now be able to access the Internet.
------------------------------------------------------------------------
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lastrachris   (Chris) lastrachris is offline
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02-Jan-2012, 04:54 PM #15
Yeah that's my usual process. I own all my equipment so it isn't special. Cox said that my connection was weird so I needed to start my router up before I turn on my modem. I want to reset the defaults on my modem but will that make me have to call my ISP and register my
Modem again?
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