Many people like to use Thunder to download movies or other resources, because Thunder downloads faster, but it has a lot of trouble. For example, there may be problems such as QQ dropped, pages cannot be opened or opened slowly, network delays are increased, etc. Such problems are simple, but the reasons are complicated. In the process of locating such problems, it feels like exploring an island and encountering strange environments. However, as long as you calm down and think, it is often easy to find a solution.
a
, DNS query frequency limit
phenomenon
question: can not open a Web page using the Thunder download, other operations require domain name resolution failed.
Troubleshooting: This case is more common, we first discovered the problem in a school's network, the user describes the use of Thunder download, can not open the page, we initially thought it was the download process connection Network device performance issues caused by too many numbers. However, during the problem location process, it was found that when the webpage could not be opened, remote assistance can still be performed through QQ to send and receive messages. The ping request was initiated at normal time, and the ping value did not rise significantly when there was a problem that the webpage could not be opened. Therefore, the network is normal. When a problem occurs that the webpage cannot be opened, the ping request is re-initiated and the domain name resolution fails.
locate the problem: According to the phenomenon, we suspect that DNS server to resolve the problem, it should be a logical limit, so the conditions might guess "DNS resolution request to initiate frequency." Because Thunder searches for candidate resources when downloading, when there are more server resources in the candidate resources, each server (Server) resource connection needs to perform a DNS resolution. At the beginning of the task, the frequency of DNS resolution It is relatively high. Therefore, changing the attribute of a download task to "download only from the original address" will not search for candidate resources. There is no problem with DNS denial resolution when the task is performed. However, if the candidate resources are not queried, the download success rate and download speed will be seriously affected.
Solution: This is not a very common limit, replace the DNS server address, the problem is solved. The specific solution is: right-click "Local Area Connection", select the "Properties" command, double-click "Internet Protocol (TCP/IP)" in the open window (Figure 1), you can see the window shown in Figure 2, Select the "Use the following DNS server address" item, enter the IP address of the DNS server of the local ISP in the primary DNS, and enter the IP of the current intranet router or the IP address of the DNS server address in the secondary DNS. In this way, our network card will use the local city's DNS server to resolve the DNS directly. If the local city's DNS fails, it will automatically resolve the address through the network router or internal DNS server, and the overall network speed will naturally increase. Of course, when Thunder downloads, it will also "swell up".
Figure 1 ready to modify the DNS server address
Figure 2 is modified DNS server address
Tip
Here are some major cities DNS server address: Beijing 202.96.0.133, Shanghai 202.96.199.132, Guangzhou 202.96.128.143, Shenzhen 202.96.134.133, you can also find the "main city DNS server address" as a keyword from the Internet.
Second, the bandwidth is insufficient or inadequate equipment performance
Description: The Web page is opened slowly when using the Thunder download, network latency increases.
issues Background: This case is the most common, it can be said that those who download the software will encounter. Therefore, we must discuss in two cases: (1) the number of connections: low-end home routers or ADSL terminals generally support up to 100-200 connections, and when Thunder downloads a common task, 50-80 connections are generally established. When downloading BT, eMule and other tasks, it will often establish more than 4 times the connection. Obviously, these connections are beyond the performance range of these network devices. The webpage is opened slowly and the delay is increased. (2) Bandwidth: When the download speed is close to the bandwidth limit, the data packet used for transmitting files will be sent and received very frequently. At this time, the packet transmission and reception initiated by other network operations will cause delay. And the downlink bandwidth is also insufficient, resulting in slow webpage opening and delayed increase.
locate the problem: (1) number of connections: According to the phenomenon we just need to download the appropriate limit frequency and the total core initiate new connections can solve this problem. But it will lead to other problems, such as uneven performance of the device, restrictions can not adapt to various environments if the same, while limiting the connection may affect the user's download speed; (2) bandwidth: only need to be based on the current bandwidth, slightly Limiting the download speed and leaving a portion of the bandwidth can solve this problem. But the difficulty is "How to always know the user's bandwidth accurately?".
solve the problem: Select "Tools" download Thunder → "Configuration" command, then click the "Network Settings" tab, then select the "intelligent speed mode" under the "download mode" (Figure 3). This is the core of the download of the Thunder network company colleagues spent a lot of time to develop and continuously improve the intelligent speed limit module, set up a variety of judgment logic, judge the user's current network status, environment, and draw a limit plan. After the launch of this feature, it did solve a lot of problems. Although there are still some problems, optimization is still going on.
3 setting smart speed mode
three LAN Download blocked
: After a start the Thunder, did not make any download task, it is dropped.
issues Background: I have found that this problem occurs with the help of a remote user, start the Thunder network cut off. It takes 5 minutes to recover after the Thunder is turned off. If you change the LAN IP, it will resume immediately. This situation is very obvious, Thunder does not download the task, it will not burden the network.
locate the problem: we determine there is a limit local area network, a network is detected Thunder IO operation, the seal on a LAN IP.
problem solving: the Thunder because the user is used in the company's local area network, and their company policy not to work with the Thunder, so conflicts with the provisions can not negotiate with the manager, it is no way to do.