ipv6 tunnel

Can the experts educate me on how the ipv6 tunnel works, like tunnelbroker.net? I am a bit confused about the ipv6 tunnel and the actual vpn tunnel. It is not a vpn tunnel, isn't it?
What does it mean by setting up a tunnel?

Thanks
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leblancAccountingAsked:
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LibipappachenCommented:
Hi,

    Yes, its not like VPN but this is similar to how you create a generic routing encapsulation (GRE) tunnel to transport Internetwork Packet Exchange (IPX) traffic through an IP network.

Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.

At the tunnel head end, an IPv6 packet is encapsulated into IPv4 packet and sent to the remote tunnel destination. This is where the IPv4 packet header is stripped, and the original IPv6 packet is forwarded further into an IPv6 cloud.

BR,
Libi
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leblancAccountingAuthor Commented:
Let me try to understand the traffic flow for the Internet.
My PC can do ipv4 and ipv6. I created a tunnel with tunnelbroker.net. When I visit an ipv4 website, it will use the IPv4 stack, then send the GET request out through my firewall. Now, if I visit an IPv6 website, it will use the ipv6 stack. So, how will this work? how does the association between the IPv6 address and the IPv4 address happen? How does the PC know to send interesting traffic to tunnelbroker.net? Thanks
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LibipappachenCommented:
Hi,


    the following doc. may helpful for you.


Read : 10.2.5.6. Tunnel Broker in :

https://www.net.vutbr.cz/intra/man/knihy/IPv6_Essentials/ipv6ess2-CHP-10-SECT-2.html

BR,
Libi
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