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I chatted with a Linksys support person and they said that the WRT400N doesn't have any facility for enabling IPv6.

If I were to use an alternate firmware on the router, would IPv6 become available or does IPv6 need special hardware?

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up vote 3 down vote accepted

No ipv6 does not require special hardware, if you installed DD-WRT on your router you have ipv6 options

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Schweet. Now let's just hope I don't brick it like my WRT54G! – Andrew Lambert May 10 '11 at 21:56
Just make sure you follow the 30-30-30 reboot procedure and you'll be fine :) – chunkyb2002 May 17 '11 at 13:08

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