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15. IP-HTTPS > Introduction to IP-HTTPS

Introduction to IP-HTTPS

Windows includes support for 6to4 and Teredo, which allow a Windows-based IPv6 node to send IPv6 traffic across the IPv4-only Internet. However, IPv4-encapsulated 6to4 traffic and IPv4 and User Datagram Protocol (UDP)-encapsulated Teredo traffic can be easily blocked by a number of methods, including the following:

  • Firewalls or routers that are attempting to minimize the allowed traffic from a point of access to the Internet (when directly connected) by using port blocking.

  • Proxy servers that proxy web traffic on behalf of web clients (when indirectly connected to the Internet via an intranet).

One solution to this problem is to carry IPv6 packets inside traffic already permitted by these network devices, such as HyperText Transfer Protocol (HTTP) over Secure Sockets Layer (SSL) (also known as Transport Layer Security [TLS]). HTTP over SSL (HTTPS) is commonly used for protected communications with Internet commerce websites when collecting private user information, such as credit card numbers. Whenever you are connecting to a web address that begins with “https://”, you are using HTTP over SSL. Another advantage to using HTTPS is that, unlike HTTP traffic, proxy servers do not queue HTTPS traffic. Thus, HTTPS can be used to establish immediate connectivity across these devices.


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