Information Technology Services Centre - IPv6 Development in CUHK
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  • IPv6 Development in CUHK

    IPv6 stands for “Internet Protocol Version 6”. It solves a number of problems that IPv4 has, such as the limited number of available addresses in IPv4. IPv6 address is 128 bits and IPv4 (such as only 32 bits.


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    1. Should I use it?

    It depends on the sites you want to visit, or from where they are visited. If they run on IPv6, you can reach them when your computers run on IPv6 too. But if they only run on IPv4, your computer must also run on IPv4. If you want to experience a website under IPv6, Hurricane Electric IPv6 Tunnel Broker would help.

    If you don't need IPv6, it may not be good to install and enable it on your computer. It’s because it will direct your computer to reach a non-existent IPv6 site whenever you try to reach a IPv4 site. This can result in needless timeout and "destination not found" messages. Please consult your IT support before using it.


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    1. IPv6 connectivity of CUHK Campus Network

    We are ready to provide IPv6 to your department if you need it. Please discuss with your LAN administrator to find out what IPv6 can do for you; if your department needs it, please email This email address is being protected from spambots. You need JavaScript enabled to view it..

    Websites that are accessible through Internet2 and CERNET2 using IPv6 can be found from


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    1. Current Applications at the ITSC on IPv6 Network

    • Web
      by browsing through IPv6 and IPv4, you will notice that the appearance is different.
    • E-mails
      E-mails may be sent and received via the standard SMTP/POP/IMAP protocols over IPv6.
    • DNS and are configured to host and Users with IPv6 connectivity can also use them as resolvers.
    • NTP can be used as peer or server to synchronize time through IPv6
    • News
      Our news server can exchange news with IPv6 peers and allow IPv6 clients to connect. Current IPv6 news peer include the University of Oregon.


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    1. Current Applications at the Engineering Department

    The University’s Information Engineering Department runs advanced networking applications which are in advance of special features of IPv6 but not available over IPv4. Current projects include:
    • Native IPv6 routing over Internet2,
    • DVD quality 3D video streaming,
    • Real-time HD Video conferencing,
    • Access Grid,
    • Providing IPv6 routing lab experiments for students.

    More information can be found at and


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    1. IPv6 on HKIX (Hong Kong Internet Exchange)

    HKIX members may now peer over IPv6 in addition to IPv4. Current v6 members include CUHK, CITIC1616, APNIC, Diyixian, and NTT.