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Recently, there are assignments in professional courses, so I chose the topic of ip tracking and anti-tracking, so I have this article.

First, take a look at the concept of STUN. STUN (UDP simple traversal of Simple Traversal of UDP over NATs,NAT) is a network protocol that allows clients located behind NAT (or multiple NAT) to find out their public network address, to find out what type of NAT they are behind and the Internet port bound by NAT for a local port. This information is used to establish UDP communication between two hosts behind the NAT router. The protocol is defined by RFC 3489.

Firefox and Chrome support WebRTC to request from STUN server and return private and public network IP. Different from XMLHttpRequest request, Firefox and Chrome that do not see network request in STUN request developer tool support WebRTC to request STUN server and return private and public network IP. Different from XMLHttpRequest request, STUN request developer tool cannot see network request!

Do friends who often play black think it safe to hang up or act as an agent? Be careful to check the water meter, . Now I will conduct the actual tests of the above two respectively.

Github link for test code: https://github.com/diafygi/webrtc-ips

Test URL: http://p2j.cn/tools/ip.html (it is not recommended to use IE browser to test, of course, it can also be tested on the console)

First of all, let's take a look at the test results after google's goagent agent is enabled. All right, the local internal and external network IP has been obtained.

# # this article is from: http://zerosecurity.blog.51cto.com##

If you look at the effect of using × ×, the local internal and external network IP and × × IP are all obtained.

So... You know

Send another Github related code: https://github.com/natevw/ipcalf/

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