Broadcom BCM57781 onboard LAN keeps dropping out and then coming back

#1
Hi

I have the above brand of LAN on a ASROCK Z68 Extreme 4 Mobo.
Router: Netgear DG834G

The whole computer is about 7 months old and as per another recent thread it has a fresh install of Windows 7 64bit Pro. However since the reinstall an issue that also existed before continues to annoy me.

Namely, the internet at times drops in and out over a period of hours and then just works.
CAT 5 Cable has been replaced and tested in another machine and is fine.

There is another laptop, older Dell with Vista on the network (wired) that has no issues, everytime my PC drops I check it and 9 times out of 10 its still working.

I just upgraded the latest driver from here

Broadcom.com - Ethernet NIC NetLink Driver Downloads

Whilst I prefer Firefox, i normally solve the issue by opening Explorer and using its Diagnose tool. Quite often it will say ' The default gateway is not available'

One bit of info, it also continously says I am on a ' Unidentified network' and ' Public Network' despite it being a simple home wired (NO wifi i switched it off) LAN. How do you change it back to HOME network? sometimes the Public Network is in blue and you can click it and tell it yet again to be HOME but other times its not in blue or clickable to change.

Surely there is something we can do other than put a separate LAN card in a slot.
 


whs

Extraordinary Member
#2
The default gateway is not available'
The default gateway is your router. One reason could be because the router is set to WEP which works with e.g. Vista, but not properly with Win7. You have to set it to WPA2-PSK. Check that first and post back. If it does not work, we'll dig further.
 


Last edited:

Saltgrass

Excellent Member
Microsoft Community Contributor
#3
Well, I will assume this is not related to any internet connection, just your network adapter and the router. Since it seems to be dropping the connection for some reason, please post the results of an ipconfig /all command when run in a command prompt window. You can copy and paste or use the snipping tool to take a picture and attach using the paperclip on the advanced reply window. Edit as you see fit.

You can also check the Device Manager and check if your network adapter is set to allow the system to turn it off to save power. Mine is set that way, but you might uncheck that to see if it makes a difference.

The next time is loses its connection, open the adapters panel (ncpa.cpl) and disable, then re-enable the adapter. It should resync and regain your connection.

I understand this is a wired connection, but I will assume network connections are dropped during a sleep cycle.

If you need any specific information, don't hesitate to post back.
 


#4
Well, I will assume this is not related to any internet connection, just your network adapter and the router. Since it seems to be dropping the connection for some reason, please post the results of an ipconfig /all command when run in a command prompt window. You can copy and paste or use the snipping tool to take a picture and attach using the paperclip on the advanced reply window. Edit as you see fit.

You can also check the Device Manager and check if your network adapter is set to allow the system to turn it off to save power. Mine is set that way, but you might uncheck that to see if it makes a difference.

The next time is loses its connection, open the adapters panel (ncpa.cpl) and disable, then re-enable the adapter. It should resync and regain your connection.

I understand this is a wired connection, but I will assume network connections are dropped during a sleep cycle.

If you need any specific information, don't hesitate to post back.

Hi, thanks for the replies

Whs:

Excuse me if I am wrong but wouldn’t what you ask only matter if I was using wireless? Whilst it is a wireless router and I do turn it on, its only in rare occasions that we have someone staying who brings an ipad or laptop.

Plus my PC is always wired to the router even if the WIFI is on.


Either way I did log into the router and look at the Security Options under Wireless settings. The WPA-PSK option is ticked. Though no option for WPA2-PSK

[TABLE="width: 100%"]
[TR]
[TD]Security Options
[/TD]
[/TR]
[TR]
[TD]Disable
[/TD]
[/TR]
[TR]
[TD]WEP (Wired Equivalent Privacy)
[/TD]
[/TR]
[TR]
[TD]WPA-PSK (Wi-Fi Protected Access Pre-Shared Key)
[/TD]
[/TR]
[TR]
[TD]WPA-802.1x
[/TD]
[/TR]
[/TABLE]

Saltgrass

I will obtain that info soon, what items should one for privacy block out in an ipconfig/all screenshot?

Here is an EVENT VIEWER Log


Microsoft-Windows-DHCP Client Events/Admin
Event ID 1002

Source: Dhcp- Client

OpCode: IpLeaseDenied

Task Category: Address Configuration State Event


The IP address lease 192.168.0.4 for the Network Card with network address 0xXXX has been denied by the DHCP server 192.168.0.1 (The DHCP Server sent a DHCPNACK message).



Thanks guys
 


Last edited:
#5
Hi Saltgrass
I have unchecked ' Allow computerto turn off this device to save power' and i have unchecked IPv6 Connectivity and rebooted.
This does not seem to have helped.

See your requested data below


Windows IP Configuration
Host Name . . . . . . . . . . . . : XXRoddyComputer
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
Physical Address. . . . . . . . . : 00-XXXXX
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.0.3(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, 5 February 2012 7:58:52 PM
Lease Expires . . . . . . . . . . : Monday, 6 February 2012 7:58:52 PM
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled


Ethernet adapter VMware Network Adapter VMnet1:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet
1
Physical Address. . . . . . . . . : 00XXX
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::3cbd:22f6:346e:195b%14(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.153.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 385896534
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-BB-20-66-00-25-22-BD-9B-07
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter VMware Network Adapter VMnet8:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for VMnet
8
Physical Address. . . . . . . . . : 00-50-56-C0-00-08
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::70c5:4298:a73a:d574%16(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.204.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 419450966
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-BB-20-66-00-25-22-BD-9B-07
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap.{102A07F1-6E6A-471D-A581-7DB781143423}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-XX
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Media State . . . . . . . . . . . : Media disconnected
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
Tunnel adapter isatap.{58148BDC-E538-4452-B200-EEB4A5F0E1B0}:
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
Tunnel adapter isatap.{FFC5DFE9-23C2-4301-8332-68E16500F849}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
 


Last edited:

Saltgrass

Excellent Member
Microsoft Community Contributor
#6
I see messages like the ones you show in Event View, fairly often, but they are usually associated with waking from sleep or reboots or something similar. It is a little different that the message says is has denied the .o4 address when your system is using .03. Maybe another device is interfering with the DHCP.

I will normally limit my DHCP assignable addresses to a specific range, so I will have some I can assign manually. Maybe something you could try, but I do not know if it relevant.

Your configuration looks good in the ipconfig report, if you was trying to go bad, you would probably see a 169.xxx.xxx.xxx IP address and no gateway. On another forum I saw someone say the IP address is renewed about half way through the Lease time. You are showing 24 hours on your leases, so that would mean the lease is being renewed every 12 hours or so. Does that amount of time seem relevant? You should be able to change the lease time in the router for testing.

The VM adapters I have no experience with. I assume you are giving them an address in another subnet without a gateway?

But right now, the thing I would suggest is to watch the system and try to pin some activity or time span to what might be happening.
 


#7
Hi
I just allowed the VMware to install itself without modifying anything. I followed a tutorial on using VMware and an old copy of XP to provide ' XP mode'.

Now that I think of it, I did install VMware early on in my original Win 7 Pro install. I might restore to an earlier point last week prior to installing VMware.

Also, i know i said i didnt want to, but if i simply went out and bought a network card would that fix it? or is it an issue between my PC and the Netgear router regardless?
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#8
You may want to give it some time before you buy new equipment, but that is your decision. For now, the ipconfig listing you posted is totally normal, as far as the Ethernet adapter. Maybe you can get us one when the system is disconnected.

Maybe watching the event log would give you a hint as to what might be going on. Maybe another system is logging on and causing problems.
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#9
If you open the Device Manager, do you show any unknown devices or anything with a yellow triangle?
 


#10
Some further data from event viewer


6/02/2012 9:56:22 PM
The system is entering sleep.

Sleep Reason: System Idle

6/02/2012 9:56:25 PM
The browser has forced an election on network \Device\NetBT_Tcpip_{102A07F1-6E6A-471D-A581-7DB781143423} because a master browser was stopped.

6/02/2012 9:56:25 PM
Event ID 8033
The browser has forced an election on network \Device\NetBT_Tcpip_{58148BDC-E538-4452-B200-EEB4A5F0E1B0} because a master browser was stopped.



6/02/2012 9:56:25 PM
ID: 7042

The TCP/IP NetBIOS Helper service was successfully sent a stop control.

The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)]

Comment: None

6/02/2012 9:56:25 PM
ID 7036
The TCP/IP NetBIOS Helper service entered the stopped state.

Device Manager - image attached but I do not think this relates to it,
Device Manager.JPG
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#11
Can you go to the Details tab and select the Hardware IDs in the drop down menu. Then highlight the top line, and select copy, then report back?

Many times the Intel Management Engine does not have drivers. I do not know if this is it, but the Hardware ID should tell us and if not, there should be an entry for it in the System Devices list. But the Port and Hub notations you show now would seem to make it some type of USB device.
 


#12
just had another drop and checked event viewer straight away

Event ID 1014
DNS Client Events
Name resolution for the name docs.google.com timed out after none of the configured DNS servers responded.
and
Name resolution for the name apir.webrep.avast.com timed out after none of the configured DNS servers responded.

Errors talking about ' no dns servers responding' is quite common
 


#14
Another drop!

Event Viewer

Service Control Manager
Event ID: 7036
The Tablet PC Input Service service entered the running state.
and on the same Event ID
The Windows Error Reporting Service service entered the running state.


DNS Client Events
Event ID 1014
Name resolution for the name dns.msftncsi.com timed out after none of the configured DNS
servers responded.
 


#15
I should add - that 3 posts up I also uninstalled the 2 VMnet adaptors appearing in the Device Manager list next to my broadcom. The connection has remained up for much longer tonight since doing this however the last 2 drops are post their removal.
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#16
Many times the messages in the Event Viewer come after the event and do not necessarily cause it.

The unknown device may be a Canon Scanner, or something like that.

I seems your system is putting the network adapter is putting the device to sleep, but I can only find a setting to allow it to do so. Since mine is enabled, I assume yours is also and should not normally be a problem. You might try changing your power scheme for testing. If you want to try to change the setting, use Device Manager and Network Adapter properties, power management tab. Perhaps some combination of your power settings and that check box is causing the adapter to go to sleep...

It looks like the master browser being referred to in the other messages is the "Computer Browser" you can find in the services.msc panel. It depends on a couple of other services, but again, this might be a result rather than a cause.

I have no idea what to take from this message..
The TCP/IP NetBIOS Helper service was successfully sent a stop control.
The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)]
 


#17
I logged into the NEtgear under Router Status ADSL port and noted there are 2 125.213.xxx Ip addresses for the Gateway Ip address..?
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#18
I don't see a Gateway IP address entry on the Router Status page.... But normally, if you have two IP addresses they are for the DNS primary and secondary servers. If you are looking at the IP address, it might be whatever the ISP assigns and the LAN address should be the 192.xxx number.

I haven't run DSL for quite a while, so there may be some settings like keep alive that might be useful. But I had the impression you thought the problem was just with your computer. Sometimes watching the lights on the front of the Router can be helpful..
 


Saltgrass

Excellent Member
Microsoft Community Contributor
#19
Are you running a VPN?
 


#20
Are you running a VPN?
No VPN, that device could be a Cannon Scanner.

In fact the whole reason I installed VMware with my old XP copy was to allow me to connect a Canon Scanner that will not work with Win 7 64bit. Due to no drivers being present.
 


This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.
Top