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I don't know its valid question or not.My question is i have eth0 interface with public IPv4 address and i already created 6to4 tunnel for ipv6.So my question is when i am trying to access a ipv6 host or address ,the system is automatically find the 6to4 for traffic or we need to specify the particular interface name.Suppose i am trying to access rdesktop over ipv6,we need to specify interface name?

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  • Don't use 6to4, it's very unreliable. Use a supported tunnel like those from tunnelbroker.net. They also provide instructions on how to configure your host. Commented May 7, 2016 at 10:04
  • i am using for experiment purpose Commented May 7, 2016 at 10:06
  • just leave that 6to4 tunnel.my question is if i am using tunnel broker or teredo the ipv6 traffic automatically use that interface ,am i right Commented May 7, 2016 at 10:08
  • If you have a working IPv6 tunnel and the destination you are connecting to supports IPv6 then usually your connections will use IPv6 Commented May 7, 2016 at 17:10

2 Answers 2

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No, what you need is just adding routing rules, if necessary.
If site-to-site tunnel(not multiSite-to multiSite)
1. different networks need routing rules;
2. Same network does not need routing rules.

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Tunnel interfaces follow exactly the same routing mechanism as regular interfaces.

  • If the destination address is link-local, it needs to be specified along with the interface name.
  • If the destination address is global, it doesn't even accept an interface name; the interface and gateway are determined according to your system's routing table.

Normally you would have a "default" route, i.e. destination ::/0, specifying which interface to use.

ip route add ::/0 via ::192.88.99.1 dev 6to4tunnel

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