Limited or no Connectivity on Network 2
Ok... I have a problem that is just making my head spin.To start, The network looks like the following:Cable Modem (Comcast) --> Router --> two PCs: 1 Windows Vista, 1 Windows 7.The Vista machine can connect to the network, and internet with absolutely no issues.The 7 will only connect if the network cable is briefly removed after every boot or wake up from sleep.Rearranged the network configuration so that it was configured as:Cable Modem --> Windows 7Comcast has run every test imaginable on the original configuration, just the Vista machine connected to the modem and the current configuration until all they could do is point out that the router and the Vista machine seem to function just fine when attached to the Modem.Now what IS the issue you ask?Every single time the 7 machine boots I get a warning in the system tray. Placing the mouse over it produces the message "Limited or no Connectivity" on a network device named "Local Area Connection Network 2", this is the only network device in Control Panel\Network and Internet\Network Connections. This device will have an IP address of 192.168.1.100 via a DHCP at 192.168.1.1 - Both addresses can be pinged. I have no idea where this DHCP server is because 192.168.1.1 is not the address of the cable modem.To correct this all I need to do is unplug the network cable and plug it back in. The network port is the only network device for this machine - nothing is pluged into it other than keyboard, mouse, monitor, power and the network cable, of course. No built in Wireless.The DHCP server will be 10.16.0.1 and the Intel NIC will have an IP Address starting with 79.36.... and I have full internet capability.Reinstalling Windows does not fix this. Different drivers does not fix this. ROUTE DELETE 0.0.0.0, ipconfig /release, ipconfig /renew does not fix this. Applying Windows updates does not fix this. 5 hours on the phone with the tech support of the company that made this PC did not fix this. The network card is integrated into the motherboard - replacing the motherboard did not fix this.It does not matter if it is "Network 2" or "Intel R..." the properties of the network connection look like the following example minus the link-layer entries (example: http://blog.hmobius.com/image.axd?picture=LoopbackAddress2.png), both using the same integrated network card under "Connect using". Any change made to "Intel R..." will be seen, replicated, after the next reboot in the properties for "Network 2". This would seem to suggest that "Network 2" and "Intel R..." are one and the same with the tiny difference of the IP addresses and the fact that "Network 2" will always produce "Limited or no Connectivity" I would like to be able to have internet access without having to disconnect the cable first.Is there any way to elliminate this issue so that the computer boots up using ONLY the "Intel R..." connection?
March 18th, 2010 8:07am

What you are looking at is a Microsoft Loopback Adapter. This is not installed by default. Have you at some time tried to share a connection to your vm using ICS? This requires an MLA (but you do not need it if you are behind a router). Go to Network and Sharing Center, then to change adapter settings. First check that your NICs are not bridged. If you see a Network Bridge icon, delete it to break the bridge. Since you do not need an MLA, find the adpater (probably Local Area Connection 2) called Microsoft Loopback Adapter. Disable this adapter. I would go back to your original setup of letting the router connect to Comcast. The router will get the public IP and can share its Internet connection to the PCs. Plug your Vista machine into a port on the router and note its network config (either from the adapter properties or an ipconfig command from a command prompt). Now plug the Win 7 machine into the router and compare its config to the Vista machine. They should be nearly identical, only the last number of the IP address should vary. If you want the vm to also have Internet access, set its NIC to link to the physycal NIC in the Win 7 host (the Intel R) from the virtual machine settings page. It should also get its config from DHCP on the router and look just like another PC on the private LAN.Bill
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March 18th, 2010 9:44am

You need to clear up something...this statement here is tell me you do not have router."The DHCP server will be 10.16.0.1 and the Intel NIC will have an IP Address starting with 79.36.... and I have full internet capability."with 10.16.0.1 as the DHCP server then your ip should be in the 10.16.0.x range NOT a public IP 79.36.x.xMost DOC2 systems (cable systems) use NAT / PAT to give out IP's unless they are in bridge mode in that case a router is a REALLY GOOD idea as you do not want the PC's to have PUBLIC ip's.so give us an ipconfig /all of the vista and win 7 boxes.
March 18th, 2010 9:55am

To Bill Grant:There is no bridging since there is only one actual network device in the PC.I have not seen anything called the "Microsoft Loopback Adapter" in either the Control Panel or Device Manager, where else could I look?No VM has been employed since the latest reinstall of the OS.In the Original network configuration:Cable Modem -- Router |-- Windows Vista |-- Windows 7With fresh boot of all componants:Router is the DHCP Server at 10.0.0.1Vista is at 10.0.0.117 is at 192.168.0.100 with "Limited or no Connectivity" on "Network 2"Unplug/Plug Network cable for 7 - 7 changes to 10.0.0.12 on "Intel R 8257 -v2 GBit" and has full networking.
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March 18th, 2010 10:47pm

But the screen shot you posted clearly says "Microsoft Loopback Adapter"! It must be there somewhere. What exactly does Network and Sharing Center say about the NIC connected to Network 2? If there is a network there must be a network interface. On the right of Network 2 there will be a blue entry alongside the heading Connections. What is it called? What do you see if you click on the blue entry? Bill
March 19th, 2010 9:05am

My deapest appologies for confusing you, Bill. I did not have a screenshot of my own so I attempted to borrow an EXAMPLE. So let me clear this up a little: "Connect Using" always says, "Intel R 82567v -2 GBit", for both "cards" The "Connection uses the following items" has: Client for Microsoft Networks QoS Packet Scheduler File and Printer Sharing for Microsoft Networks Internet Protocol Version 6 (TCP/IPv6) Internet Protocol Version 4 (TCP/IPv4) IPv6 is the only one that is unchecked. Sorry again, for not being more clear.
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March 19th, 2010 5:00pm

Go to Control Panel | System | Device Manager. If you expand Network adapters, do you see any entries apart from your Intel NIC? If you select "Show hidden devices" in the view tab, what do you then see? Bill
March 20th, 2010 9:36am

Hi, Please answer Bill's question. Meanwhile, I suggest you uninstall the network adapter in Device Manager and reinstall the driver for a test. If the issue persists, please assign a static IP address instead to check the result. Thanks, Novak
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March 23rd, 2010 4:56am

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