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Apparently, I can enable IPv6 in two ways. To test, I first confirm it's not enabled currently.

$ ping6 -c 1 ::1 socket: Address family not supported by protocol

I then enable it immediately

$ sudo modprobe ipv6

And ping6 -c 1 ::1 now works. To enable it at boot, I append ipv6 on a single line to /etc/modules, then reboot. However, it's unclear if IPv6 is working now.

$ ping6 -c 1 ::1 connect: Cannot assign requested address

N.B. it's a different error to the first one. If informative, the original enabling doesn't work now either.

$ sudo modprobe ipv6 $ ping6 -c 1 ::1 connect: Cannot assign requested address

How can I enable IPv6 at boot?

EDIT

Here are the contents of /etc/network/interfaces. It's a static IP.

auto lo iface lo inet loopback iface eth0 inet static address 192.168.1.91 netmask 255.255.255.0 gateway 192.168.1.254 allow-hotplug wlan0 iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf iface default inet dhcp
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  • What OS? An ancient link to an answer on an obsolete OS are meaningless. Commented Oct 23, 2016 at 9:33
  • @Milliways Oops, sorry, forgot. I added the Raspbian tag. FWIW the official FAQ suggest the same thing (I edited in that link too). Commented Oct 23, 2016 at 9:34
  • Why have you put an (incorrect) ip4 static address into your file? See How do I set up networking/WiFi/Static IP Commented Oct 23, 2016 at 9:36
  • @Milliways I'm not sure which part you're referring to? The file looks pretty similar to your link. The 192.168.1.91 part? Commented Oct 23, 2016 at 9:41
  • That is NOT the recommended method of setting static (which I recommend against), and is there for those who insist on using Debian networking, and is conditional on disabling dhcpcd. But why IP4 in a question about IP6? Commented Oct 23, 2016 at 9:46

1 Answer 1

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As of Raspbian 8/Jessie, IPv6 is enabled in the Raspbian images right from the start. There is no need to touch any configuration.

With the dhcpcd client installed, IPv6 stateless address autoconfiguration (sic!) will be used with stable semantically opaque IIDs (interface identifiers). You only need a router advertising an IPv6 prefix (or several). In addition, DNS server addresses will also be autoconfigured from the router advertisements (RA). It's perfectly fine to have the RAs set M=0 and O=0, that is, no DHCPv6.

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