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Video can't open fault location.

2025-01-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >

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Shulou(Shulou.com)06/01 Report--

Recently, I received a report about Letv at a certain point, and the video could not be watched. It is strange to receive a report, because the terminal can watch videos from other sites, as well as speed measurement and download applications are normal. So judge by common thinking, grab the bag and have a look.

Troubleshooting steps:

1) filter wireshark messages with ".letv", and no valid video get requests are found. However, when the client has relevant prompts such as "the network cannot be connected", it is initially suspected that the browser failed to issue such a video GET request, perhaps the message was not sent.

2) then filter the exception message and find that there are some SYN request connection messages, but there is no ACK reply of 115.182.93.x, and some other similar ip are also found.

3) We all know that when visiting a website, any element on the site has its own url, and its domain name is each sub-domain name, and there are links to external sites. Then you need to locate the url related to the video, and then find the IP that needs to be located.

4) in a similar and normal network environment, when you make the same request to watch, it is found that it can be viewed, and the feasible URL is also crawled, as follows: the scheduling domain name is g3.letv.com

5) when the domain name is resolved at the point of failure, it is found that it can be resolved normally. As follows:

6) at this point, we can find that the problem IP is the IP we dispatched. Then, during the network connectivity test, it was found that ping could not be reached. Then provide guarantee to the relevant network departments to deal with the routing problem.

To sum up, this problem can be used in the future: the video url----ping scheduling domain name-location problem can not be caught. The secondary method can also be used for get requests without http; the troubleshooting method cannot be applied to video stutters and the phenomenon of black screen after watching part of the video.

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