Connection to cable router dropping out

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raevans

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Aug 3, 2014
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Hi all,

I'm "averagely computer literate" and will happily provide additional information if you request it, but bear with me as I try and explain my way through this problem.

I have several different computers connected in different ways to a Cisco DPQ3925 router on the Optus cable network (Australia). A (suspect culprit) desktop connected through power point LAN, iMac(Wifi), a laptop -Wifi/LAN and 2 x iPhones (Wifi), TV(LAN), Xbox(LAN), Surround sound(LAN) and PVR(LAN).

Many months ago the internet was disconnecting and we had Optus (Australian cable company) out to look at everything and they gave it the OK. Then I replaced the memory in my desktop and reloaded Win 8.1 and everything got a lot worse.

In general, if my desktop wakes from sleep, it will have internet connection for about 30 seconds then lose it. I try the "trouble shooting" option and it give varying reasons with varying success rates of reconnection. However the problem is not just limited to wake from sleep, but also when I'm actively using my computer, just more consistently when it wakes from sleep.

Strangely this also shuts down the entire network, no other computer can connect to the internet.

Although sometimes the desktop will have access when the iMac doesn't.

I have the laptop connected directly into the router via LAN and it can't even connect to the router (ie. 192.168.0.1).

Rebooting the router doesn't fix the problem either.

However if I just walk away and leave everything for 10 or so minutes it all seems to work it self out and all computers connect.

I've tried setting up a static IP on my desktop and that didn't help.

I've also tried using wireless on my desktop and that didn't help.

Because it's such an intermittent problem I can't get Optus out because they'll just say it's my computer and charge me $$$$'s.

Any help would be appreciated.

Thankyou.
 
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raevans

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Aug 3, 2014
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I don't have another router. I have had my laptop connected directly to the router and it also drops out when my desktop fires up. My partner was home today using wireless and had zero problems as my computer wasn't turned on all day.

I also don't have any virus scanners on my desktop computer.

I can try hooking up my desktop directly to the router but it will have to wait until the weekend to move it to the living room for a few days.
 
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Syntax42

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Aug 4, 2014
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Routers and modems are not the same thing. If you have one piece of equipment, it is possible they included both the router and modem in the same device. If you have a router which connects to a modem, bypass the router.

It does sound like an IP address conflict. Try setting your desktop to have a static IP outside of the DHCP range. For example, set your DHCP range to 192.168.0.5 to 192.168.0.99 and give the computer an IP of 192.168.0.150.
 
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raevans

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Aug 3, 2014
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Thanks. Here's a copy of ipconfig /all whilst the computer is working, just in case that's any help as a comparison.
Now I just need to get try and get it to disconnect. I'll force my comp to sleep and see what happens.

C:\Users\Richard>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Megabitch
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Qualcomm Atheros AR8161 PCI-E Gigabit Eth
ernet Controller (NDIS 6.30)
Physical Address. . . . . . . . . : 90-2B-34-D9-77-33
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::6866:5490:b90f:2c15%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.51(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 03 August 2014 09:56:24
Lease Expires . . . . . . . . . . : 29 November 2014 11:04:22
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 261106484
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-1E-64-1C-90-2B-34-D9-77-33

DNS Servers . . . . . . . . . . . : 211.29.132.12
198.142.0.51
198.142.235.14
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 12:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6ab8:14af:7f0:91eb:d0e1(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::14af:7f0:91eb:d0e1%4(Preferred)
Default Gateway . . . . . . . . . : ::
DHCPv6 IAID . . . . . . . . . . . : 83886080
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-1E-64-1C-90-2B-34-D9-77-33

NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{C5486083-AC5A-4CE0-836D-0A82ABE48CC0}:

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

**************

Got the desktop to "crash" the network connection easily by forcing it into and out of sleep mode. Here's the ipconfig....

C:\Users\Richard>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Megabitch
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Qualcomm Atheros AR8161 PCI-E Gigabit Eth
ernet Controller (NDIS 6.30)
Physical Address. . . . . . . . . : 90-2B-34-D9-77-33
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::6866:5490:b90f:2c15%3(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.51(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 03 August 2014 09:56:24
Lease Expires . . . . . . . . . . : 29 November 2014 12:06:06
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 261106484
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-1E-64-1C-90-2B-34-D9-77-33

DNS Servers . . . . . . . . . . . : 211.29.132.12
198.142.0.51
198.142.235.14
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 12:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6ab8:14af:7f0:91eb:d0e1(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::14af:7f0:91eb:d0e1%4(Preferred)
Default Gateway . . . . . . . . . : ::
DHCPv6 IAID . . . . . . . . . . . : 83886080
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-1E-64-1C-90-2B-34-D9-77-33

NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{C5486083-AC5A-4CE0-836D-0A82ABE48CC0}:

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

viewtyjoe

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Jul 28, 2014
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Does your ISP have full IPv6 support? If not, I would suggest totally disabling IPv6 for now on your router/modem (or both, if you're using one of each). Tunneling can cause some really weird issues, and if the ISP isn't IPv6, there's really not much benefit in having it enabled on your home network.
 
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Shaun o

Shaun o

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Oct 7, 2007
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You know to me it sounds like flood protection.
This one is obvious, its down to the fire wall ISP settings of the Cisco router
If for example the period of disconnection is for a set time then a re connection is made.
In such a case turn of flood protection.
Time it, a few times see if it re connects at the passing of set minuets.
Then you know its flood protection.


Once flood protection kicks in it applies it to all computers or adapters linked to the router. Dumps all connected devices.


By default it is turned on in the router, so untick it and apply.


 
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viewtyjoe

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Jul 28, 2014
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I always forget flood detection specifically because I immediately turn it off on any router I use. This actually sounds really likely, though I'm surprised that Cisco's equipment doesn't have some sort of "Hey, the router thinks you're flooding it intentionally, are you?" prompt.
 
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raevans

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Aug 3, 2014
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I've disabled the IPv6 protocol through my computer, but can't see where to disable it in the actual modem/router?

I ran a test and apparently my provider does not have IPv6 and I believe my modem/router doesn't support it either.
 
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R

raevans

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Aug 3, 2014
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R

raevans

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Aug 3, 2014
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I thought you'd solved my problem for a bit. Changed to static IP of 192.168.0.150 and it worked without a hitch, forced into and out of sleep mode with no problems. Worked great this morning, then tonight got home and same problem. :-(
 
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Syntax42

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Aug 4, 2014
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