resolvconf script overwrites entries in resolv.conf - RDNSS/DNSSL related

Mattia Rossi mrossi at
Wed Aug 10 23:23:05 UTC 2011

On 10/08/2011 17:29, Hajimu UMEMOTO wrote:
> Hi,
>>>>>> On Mon, 08 Aug 2011 16:42:06 +1000
>>>>>> Mattia Rossi<mrossi at>  said:
> mrossi>  Anyhow, the manpage is really not clear about name_servers_append, and
> mrossi>  it's not working as expected either:
> mrossi>  1) If I put in a comma separated list of nameservers, I'll find that
> mrossi>  comma separated list in /etc/resolv.conf under a single "nameserver"
> mrossi>  tag. That doesn't work, as it's not a valid entry. Each nameserver
> mrossi>  needs to have a "nameserver<host>" entry.
> name_servers and name_servers_append is a space separated list of
> nameserver.

Ahh, okay, that works. Might be worth mentioning in the manpage though. 
Maybe an example wouldn't be too bad either

> mrossi>  2) If I use multiple name_servers_append entries in
> mrossi>  /etc/resolvconf.conf, then only the last entry is used. I don't want
> mrossi>  only one DNS server there though, I want all three of them, as I
> mrossi>  already had the problem that one or the other didn't work properly.
> You can specify multiple nameservers in name_servers and/or
> name_servers_append.

Of course, once 1) is solved 2) is redundant.
> mrossi>  3) If I read the description for name_servers in resolvconf.conf(5), I
> mrossi>  understand that this tag prepends the nameserver to my list. This is
> mrossi>  not what happens. Still not sure what actually happens there...
> It is strange to me.  If you specify name_servers, it should be
> prepended to the nameserver list.  I've just tried name_servers, and
> it did the job as expected, here.

Hmm, not sure what happened last time here, but I've tried it now with a 
single nameserver, a space separated list of nameservers and a mix of 
name_servers and name_servers_append entries and it worked perfectly.
It also eliminated duplicate entries in name_servers and 
name_servers_append, preferring the one in name_servers. Again, maybe 
worthwhile mentioning in the manpage.

> mrossi>  How do I get my 3 manual DNS entries properly into my resolv.conf ?
> Please specify your 3 servers as space separated list in name_servers
> or name_servers_append.

Yes, got it. All good! Thanks to all!


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