Comment # 5 on bug 1003886 from Vincent Untz

(In reply to Michal Kube��ek from comment #4)
> /proc/sys/net/bridge only exists when bridge module is loaded. So I guess
> the problem here is that either bridge module is not loaded at all (it isn't
> unless someone needs it) or it is loaded after sysctl files are processed.
> 
> If someone really wants to override the default, install directive in
> modprobe.conf is probably the way to go.
> 
> That being said, I find the reasoning in bsc#845496 rather weak (and the
> comment in sysctl file misleading) and I don't see any mention there that
> the change was intended to affect anything else than cloud setups. Therefore
> I find very disturbing that such change was imposed on all openSUSE and SLE
> systems without discussing this with networking developers first (or at least
> telling them). And also without testing, apparently.

I don't know how the changed end up in the distro; the change for bsc#845496
was only done in Crowbar.