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I'm trying to enable inet6 on my loopback device. I added the following in the /etc/network/interfaces file and restated networking. But ifconfig lo still only shows inet addr and not inet6 addr. 

auto lo
iface lo inet loopback
iface lo inet6 loopback

I use a Ubuntu 16.04.1 LTS machine.

Thanks in advance

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  • 1
    Would you paste the output of ifconfig lo or ip addr show dev lo (add to the question please)? Commented Dec 2, 2016 at 21:47
  • What shows cat /proc/cmdline Ipv6 is normaly on under xenial. cat /etc/sysctl.d/10-ipv6-privacy.conf Commented Dec 3, 2016 at 12:38

1 Answer 1

Reset to default
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The issue was that ipv6 was disabled in sysctl. Once I enabled, both eth0 and lo had ipv6 addresses.

sudo sysctl -w net.ipv6.conf.eth0.disable_ipv6=0
sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
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