[Pkg-exim4-users] dc_minimaldns not working?
superapotheker at m-air.de
Sat Mar 15 20:51:49 UTC 2008
On Sat, Mar 15, 2008 at 11:35:33AM +0100, Marc Haber wrote:
> Interesting. I have installed etch r2 in a virtual machine, and see
> the AAAA lookups as well. However, when I dpkg-reconfigure exim4 for
> minimaldns, the AAAA lookups seem to vanish on my test system.
If this is only a problem on my box and not etch in general, it's ok
then. I solved it for me as described in my previous posts.
> I would think that there should be a different loopback address for
> IPv6 as well, but I don't know enough about IPv6, and for me, setting
> minimaldns eliminates the lookups on exim startup
I looked into this today. For IPv4, RFC 3330 (Special-Use IPv4
Addresses)  says:
127.0.0.0/8 - This block is assigned for use as the Internet host
Regarding IPv6, RFC 4291 (IP Version 6 Addressing Architecture) 
Address type Binary prefix IPv6 notation Section
------------ ------------- ------------- -------
Loopback 00...1 (128 bits) ::1/128 2.5.3
and in Section 2.5.3 (The Loopback Address):
The unicast address 0:0:0:0:0:0:0:1 is called the loopback address.
Seems like IPv6 has only one loopback address.
If you agree that the solution then is to append the hostname to the
line beginning with "::1" in /etc/hosts, i wanted to suggest to include
this in Section 1.3.7 of the FAQ, like this:
Add an IPv6 record for your hostname (listed in /etc/hostname)
to /etc/hosts by creating a line that says
::1 ip6-localhost ip6-loopback <your_hostname>
If there is already a line starting with "::1", append your hostname
to it. You can check with "getent hosts your_hostname" whether
this was successful.
What do you think about it?
> > Then why is an IPv6 entry for the hostname given during installation
> > missing?
> I guess because it hasn't been implemented yet.
But /etc/hosts contains IPv6 entries after installation? Looks like it
is just the hostname that is missing.
> Sorry that I am not a big help. I do not see the issue
Never mind and thanks for your time!
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