Comment 1 for bug 251355

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Jamie Strandboge (jdstrand) wrote : Re: Please set /etc/default/ufw's ipv6 line to yes

Thank you for using Ubuntu and taking the time to report a bug. Enabling IPv6 by default at this point in time is IMO not a good idea generally, as it is not in widespread use. IPv6 users can easily enable it if needed. This issue can of course be revisited when IPv6 is more widely deployed.

When IPv6=no, and a user runs 'ufw enable' (perhaps running disable before), the chains are default DROP as stated in the documentation. However, there is a bug in the initscript that doesn't set IPv6 up correctly on boot. This will be addressed in a future release.