Add ip6-localhost

Add ip6-localhost to hosts file

In Ubuntu:

127.0.0.1   localhost
# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

In Android:

127.0.0.1       localhost
::1             ip6-localhost

[ginoledesma]

Keeping the current behavior (generate IPv4 only) and making IPv6 generation optional makes sense.

I wouldn’t necessarily say that it’s IPv4 and IPv6 are mutually exclusive — many locations might have dual deployments. That’s how I ran into this issue — the WiFi access point I connected to handed me out both an IPv4 and IPv6 address, and I wondered why I was seeing ads from known blocked sites.

I agree that IPv6 deployment is minimal compared to IPv4, and will probably be the case for some time still, but a lot of places are doing IPv6 rollouts slowly but surely (e.g. conferences offering WiFi).

[ScriptTiger]

Since this topic seems to be tending, if you’re up for a bit of light reading, these articles are pretty good and address some common problems people might have, such as needing to use zone IDs with link-local IPv6 addresses in the hosts file and little known things like that. https://technet.microsoft.com/en-us/library/bb726995.aspx https://technet.microsoft.com/en-us/library/bb962069.aspx