[SSSD-users] timeout and offline mode behaviour

Simo Sorce simo at redhat.com
Tue Jun 3 12:40:15 UTC 2014

On Tue, 2014-06-03 at 06:36 +0000, Thomas Rücker wrote:
> On 3 June 2014 06:25, Joschi Brauchle <joschi.brauchle at tum.de> wrote:
>         On 06/02/2014 05:39 PM, Simo Sorce wrote:
>                 On Mon, 2014-06-02 at 10:34 +0200, Joschi Brauchle
>                 wrote:
>                         These are some of the details:
>                         1) The LDAP server has a local 192.168.x.x IP,
>                         which is resolvable globally.
>                 IPs in the 129.168 are not resolvable globally, they
>                 are private
>                 addresses and routing is not allowed outside private
>                 networks.
>         What I meant is that the DNS hostname of the LDAP server
>         'gemini.lnt.ei.tum.de' is globally resolvable to its private
>         '' IP address. Unfortunately, this DNS setup
>         cannot be changed..
> And neither can corporate firewalls be easily changed to return
> failures instead of dropping packets. (our IPs are non-rfc1918) I know
> it's well meant advice from Simo, but reality disagrees with the
> implementation. Also if I read Joschi's further part of the mail
> correctly it might even happen if the IP stack thinks it's unroutable.

Understandable, but there are some conditions SSSD simply cannot know
about w/o outside knowledge.

> I agree it would be nice and preferable to just adjust the environment
> to fit this, but many users might not be at liberty to do so.

True, but then they need to be able to do something else at the system

> I have a script that adds blackholes to the routing table just to work
> around this brokenness if it detects a non-corporate network. I'd
> rather not roll that to the corporate landscape.

Well, one way could be to use a DNS name that simply does not resolve
outside your network, maybe that is also not feasible, and is subject to
caching issues too.

Perhaps we could provide a way yo tell sssd to go permanently offline so
you can build a script to turn this on/off based on your external
knowledge of the network environment, would that work ?


Simo Sorce * Red Hat, Inc * New York

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