Solve the problem of Win7 and Ubuntu dual system Ubuntu can't surf the internet

1, the basic configuration of the computer as follows.

My Computer Dale OptiPlex 9020 Mini Tower
Operating system Windows 7 Professional Edition 64-bit SP1

Ubuntu 14.04

2. The process of loading the system is no longer to repeat.

can refer to http://blog.csdn.net/zimosangtian/article/details/41852905

3, open Ubuntu, because bloggers in school use campus network, so use DSL to establish dial-up connection.

After entering your account password. Prompt cannot connect

4, first try to modify the Ubuntu, Update,staticip,dns changes and so on, are useless.

It's all a bloody lesson for classmates.

5, and then try to Win7 under the changes, first change the Device Manager, network adapter----Ethernet----advanced wake-up mode matching, enable change to Disabled. Then cut back to Ubuntu to try to connect and not succeed. Yes, it's a nine-headed snake.

6, back to Win7, first change the previous step to default back to the original value. Then I cut the Ethernet directly, because there is a big God on the Internet that may be a dual-system network card conflict. Then start Ubuntu and dial again to login successfully.

7, finally, in the classmate's win10 and ubuntu16.04 to try to solve this problem, still can not succeed. The classmate said this must be between Dell and Ubuntu transaction is not in place, Dell's adaptation to Ubuntu only 14.04.

So I believe, but Win7 and ubuntu14.04 problem is solved, is every login Win7 need to turn on Ethernet, shut down the Win7 need to disable Ethernet more trouble.

8. You can also refer to these three URLs. Is the way to turn off wake on the network, unplug the NIC and snap the battery--try it sometime.

Http://blog.sina.com.cn/s/blog_8e6bfecf0100vnok.html

Analysis of the problem, it is possible that, after installing Linux, if you use the Windows system, the Windows system will default to the network card wake On-lan after shutdown set to disable, that is, the network card blocked until the next time to enter Windows ... (Pit Daddy)
Once you have identified this problem, there are several solutions:
1. Update the NIC driver. Download the latest network card driver installed on the official website, in Device Manager, network adapter, properties--Advanced, if there is a wake On-lan after shutdown option (can be turned on via LAN after shutdown), set it to enable on the line. Unfortunately, the general Realtek Nic has this setting, and the Broadcom NetXtreme Gigabit Ethernet network card on my desktop is just not there.
2. Find ways to activate Windows-blocked NICs in Linux ... I'm still trying, I didn't try.
3. Buy another Realtek Nic plugged into the motherboard ... This should be reliable, is a bit of trouble.
In a word, I met a problem with a very sore egg. I finally unloaded the motherboard battery to discharge it, and then I re-installed fedora.
There were a couple of times after switching from Windows back to Linux and not being able to surf the Internet; My way is: whatever he is. Start Linux the next morning, basically have access to the Internet. I suspect that in addition to windows in the shutdown, in addition to blocking the network card, there are some streaming data piled up in the network card has not been processed, it will take some time to be good.

9. Yesterday tried 8 inside the first method, although in the win Device Manager did not find the remote network wake (Wake on LAN), but found in the BIOS wake on LAN, the inside of the disable to get rid of the good.

I use the Dell Optiplex 9020,wake on LAN display three options, the default is disable, that is, the first option, I changed to the second option (specifically not clear-), in short, the other two options set to a short one on the line.

Then start the win to start the network card, to ensure that win can be normal Internet, and then start Ubuntu, you can dial the Internet normally.

10. Guess when modifying the wake on LAN, it may erase some of the configuration or protect data written by win in the network card, which will no longer cause network card conflicts caused by the dual system.

If this is the case, then the other two methods in 8 may also work, that is, to unplug the network card and buckle the battery.

Remains to be tried.

11. Restarting Ubuntu this evening is not going to be online anymore.

directly into the BIOS to modify the wake on LAN again, this time LAN only changed back to unable, then Ubuntu back to normal.

Well, it must be that every time you modify the BIOS, some of the settings in the NIC will be erased.

Solve the problem of Win7 and Ubuntu dual system Ubuntu can't surf the internet