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I remember that some distribution installers asked in the past if IPv6 should be enabled or not. Perhaps the Fedora installer did (or does) it as well.

How do I easily check a Fedora system (>= 17) if IPv6 was enabled/disabled during the installation?

Or how do I check if the Fedora system is ready for IPv6 enabled routers?

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3 Answers

Use /sbin/ifconfig or /sbin/ip a l and look for any lines starting with inet6.

$ ip a l eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.5/24 brd 192.168.0.255 scope global eth0
    inet6 fe00::000:00ff:febc:a0/64 scope link
       valid_lft forever preferred_lft forever
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lsmod |grep -i ip will show loaded IP-modules. If you see ipv6 modules parts are active.

If you see an IPv6-address as described by skohrs you are already able to configure an IPv6-address to an interface.

It does not matter what your cable is connected to (router, switch, crossover, ...).

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Fedora configures native IPv6 by default.

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This doesn't answer the question: the OP is not looking for an assertion, but how to check that it is in fact enabled. –  jasonwryan Jan 25 '13 at 1:33
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