dhclient and resolv.conf.sav

[Willy Offermans]

Dear FreeBSD friends,

Is this behavior, related to dhclient and /etc/resolv.conf.sav, FreeBSD
specific or is it a general feature of dhclient? I might have a use for
it on my debian linux laptop.

On Thu, Jul 10, 2008 at 11:57:41AM -0500, Brooks Davis wrote:
> On Thu, Jul 10, 2008 at 10:52:35AM +0200, Patrick M. Hausen wrote:
> > Hello,
> > 
> > we have been bitten by something that obvoiusly
> > is a feature, not a bug, but I do not quite understand
> > the intentions and reasoning behind it.
> > 
> > I have a host with manual interface and resolver configuration
> > and an additional interface that should get it's IP address
> > via DHCP. But only it's IP address and netmask, nothing else.
> > 
> > The DHCP server used hands out only IP addresses/netmasks,
> > no domain-name-servers, domain-name, etc. configured.
> > 
> > Yet, if there happens to exist a /etc/resolv.conf.sav file,
> > every renewal of the lease by dhclient overwrites the contents
> > of /etc/resolv.conf with those of resolv.conf.sav.
> > 
> > In my particular case the .sav file contained an internal
> > nameserver that was used when I initially set up the host
> > in the lab. This entry was of no use to the server after
> > it had been deployed in our datacenter.
> > 
> > Can anyone shed some light on the intended mechanism?
> > Studying the dhclient-script was not too helpful, either.
> 
> I suspect the theory is that you can have a static resolv.conf around
> that gets installed when there isn't anything else to use.  In practice,
> I think it mostly causes problems.  I'm somewhat tempted to remove the
> creation of the file and add something like a resolv.conf.default in
> it's place.
> 
> -- Brooks



-- 
Met vriendelijke groeten,
With kind regards,
Mit freundlichen Gruessen,
De jrus wah,

Willy

*************************************
Dr. W.K. Offermans
CAT Postdoctoral Fellow
CAT Catalytic Center
Institut für Technische und Makromolekulare Chemie
RWTH Aachen
Worringerweg 1, Raum 38C-150
D-52074 Aachen, Germany
Phone:  +49 241 80 28592
Home:   +31 45 544 49 44
Mobile: +31 653 27 16 23
e-mail: Willy at Offermans.Rompen.nl
e-mail: Willy.Offermans at CatalyticCenter.RWTH-Aachen.de

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