via: http://tieba.baidu.com/p/4737599703
I always thought it was a problem with domain name resolution, but I didn't think so. Today, when I searched for "ubuntu16.04 domain name resolution is slow" on Baidu, I accidentally saw this blog connection
http://blog.csdn.net/ferrarifomaul/article/details/51544634 , the title is "Ubuntu 16.04 LTS connection to wireless Internet is slow" Solved", which is exactly the symptom of my computer.
Original:
After installing Ubuntu 16.04 LTS to connect to the wireless Internet, I found that it was surprisingly slow. The effective way to find the pro-test online is:
1. Run in the terminal: sudo gedit /etc/modprobe.d/iwlwifi.conf
2. Add in the blank space in the opened configuration file: options iwlwifi 11n_disable=1
3. Save the file and reboot. (I have succeeded.)
I tried his method and it worked, but I am not at ease with the solution.
So I searched for "wireless network card 11n" and found the following description:
802.11 is the standard for wireless network connection, which is what we usually call WIFI.
It is relatively simple to use, as long as the network card is inserted into the computer, and the corresponding version of the driver is installed, you can search for wireless networks and connect to use.
2. 802.11b refers to the rate standard of 11M, 802.11g refers to the rate standard of 54M, and 802.11n refers to the rate standard of 150M.
The transmission speed of 802.11n is estimated to reach 540Mbit/s (requires a higher transmission rate at the physical layer), and this new standard should be 50 times faster than 802.11b and about 10 times faster than 802.11g.
802.11n will also transmit to a longer distance than the current wireless network. Different from the model, BG can only support 54M bandwidth, BGN can support 150M or 300M bandwidth, and they are all backward compatible!
802.11n is a relatively new network card, and the maximum speed seems to support 128M/s, but the maximum speed of ordinary wireless routers is only 54M/s, which is actually unusable, and our telecom broadband is generally only 3M. . . . .
So I guess our router does not support the 11n standard, and the system always uses the 11n standard to find it to connect. If it fails, try other standards, which wastes time. options iwlwifi 11n_disable=1 In this way, if you disable 11n, there is no need to try it, and you will communicate with the router once.