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Bug#686970: Inconsistent ipv6 handling of localhost in netbase and netcfg



On Tue, Sep 18, 2012 at 10:25:06AM +0200, Bjørn Mork wrote:
> For example:
> 
>     bjorn@canardo:~$ grep localhost /etc/hosts
>     127.0.0.1       localhost
>     ::1     ip6-localhost ip6-loopback
> 
>     bjorn@canardo:~$ host localhost
>     localhost has address 127.0.0.1
>     localhost has IPv6 address ::1
>     bjorn@canardo:~$ host ::1
>     1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa domain name pointer localhost.
> 
> This is not good...  Which addresses will a service listening on
> "localhost" listen too?  Seems it depends on whether DNS is available or
> not.  Isn't that seriously buggy?

Well, if you redefine localhost on your local DNS server, that's what
you get…

Is there an RfC that regulates localhost's definition?

Kind regards
Philipp Kern

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