Re: /proc/sys/net/ipv[46]/conf/ issue unsolved

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Neil Horman wrote:
On Tue, Feb 13, 2007 at 03:29:04PM +0200, Hasso Tepper wrote:
There is long standing issue in kernel which makes using /etc/sysctl.conf
useless for boottime configuration of specific interface properties and
breaks probably any software relying on unconditional existence of the
conf trees like it was in previous kernels (I alone have written several
pieces of such software). It's broken AFAIK from 2.6.15. There has been
several notes about issue in the list, but issue haven't got any (at least
efficient) attention from developers.

The current behaviour bites users in many ways and breaks several use cases.
I asked several times in the past "what I should do now?" question, but
got no clear answer.

References:
http://marc.theaimsgroup.com/?l=linux-netdev&m=115685059625467&w=2
http://marc.theaimsgroup.com/?l=linux-netdev&m=115690828822486&w=2
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169809

Is there any chance this will be fixed or at least clear position is
taken by developers? Breaking userspace applications is declared nonono
several times in the past ... I'm not even against breaking it if there
is _very_ good reason to do it. Ok, but I want to know how userspace is
meant to behave now. I can't continue using crappy workarounds.

Can't this simply be fixed by adding a custom udev rule?  Correct me if I'm
wrong, but the only reason that interfaces come up automatically after their
appropriate module is inserted is because most distos udev rules issue an ifup
$DEVICE when they get a creation event for $DEVICE.  Why not add a custom rule
in for net device creation events to set appropriate sysctl values before the
ifup is issued.


You can't. The /proc/sys/conf/eth<x>/ structure appears when the interface is marked UP. At this point, if protocol modules are already
loaded, your configuration parameters are already set.

I was going to ask.. How are you testing Optimistic DAD patch.  The
only way I could do it was to set /proc/sys/conf/default/ipv6  entry.

-vlad
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