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

[Mattia Rossi]

On 05/08/2011 16:52, Doug Barton wrote:
> On 08/04/2011 22:59, Mattia Rossi wrote:
>> Hi all,
>>
>> I've finally patched my 8.2 IPv6 gateway with the RDNSS/DNSSL patches
>> and I'm distributing DNS servers that way now. Works fine, my box
>> running CURRENT picks up the DNS servers and search domains and writes
>> them into /etc/resolv.conf using the resolvconf script.
>>
>> The script anyhow overwrites my previous manual entries in
>> /etc/resolv.conf which I need for my manual IPv4 setup...
>>
>> I think it's an easily fixable bug - haven't looked into it that close
>> atm., but given that the resolvconf script is going to be
>> rewritten/enhanced anyways, that's something to keep in mind.
>> I think that manual entries should always be preferred.
>
> Check 'man resolvconf.conf' for information on name_servers_append. It
> would probably be nice if there was a _prepend equivalent.
>

Okay, finally got around to read that manpage (which I didn't realise 
that it existed). So For RDNSS/DNSSL we have now the following manpages 
related to resolv.conf: resolvconf(8), resolv.conf(5) (aka. resolver(5)) 
and resolvconf.conf(5)... Lot's of resolvconfs :-)

Anyhow, the manpage is really not clear about name_servers_append, and 
it's not working as expected either:

1) If I put in a comma separated list of nameservers, I'll find that 
comma separated list in /etc/resolv.conf under a single "nameserver" 
tag. That doesn't work, as it's not a valid entry. Each nameserver needs 
to have a "nameserver <host>" entry.

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

3) If I read the description for name_servers in resolvconf.conf(5), I 
understand that this tag prepends the nameserver to my list. This is not 
what happens. Still not sure what actually happens there...

How do I get my 3 manual DNS entries properly into my resolv.conf ?

Mat