[lug] SIOCADDRT in network startup

[D. Stimits]

Erick Bodine wrote:
> 
> Nate,
> 
> This box is less than a month old.  It is build with 2.2.14-6.1.1 kernel and RH 6.2; so no possible left over crud from a 2.0.x kernel upgrade.

If you have any kernel installed that is not the original, you still
have the possibility of leftover modules. It puts new modules in
/lib/modules/...version_scheme.../. If a module already exists, "make
modules_install" overwrites it; but if you did not create and do not
require a particular module that used to be there, it will remain, and
depmod may try to use it. When installing a new kernel, if it is the
exact same version number as another, you're best off if you first mv
the /lib/modules/..whatever../ to /lib/modules/..whatever-backup../
first.

> 
> Erick Bodine
> Xpedite Systems Inc
> Boulder CO
> 
> Nate Duehr wrote:
> 
> > And the SIOCADDRT: Network is unreachable is usually a sign that you
> > have unnecessary cruft left over from a 2.0.x kernel for starting your
> > network if your network is working properly.
> >
> > Trying to dig back here in the grey matter this early in the morning is
> > painful, but it seems to me the 2.2 kernels automatically do their route
> > add for the local network or they do it differently than the 2.0 kernels
> > did.  Many distros didn't clean up the old stuff during "upgrades" to
> > the next kernel.
> >
> > How old is the box, could that be it?  Was it upgraded?
> >
> > I'm sorry I can't remember the details right now... and I've done a
> > bunch of web searches trying to remember what the details were...
> > sigh...
> >
> > Nate Duehr, nate at natetech.com
> >
> > "D. Stimits" wrote:
> > >
> > > Erick Bodine wrote:
> > > >
> > > > I see the following in /var/log/messages whenever I reboot or restart networking.  Though it says that the network is unreachable, I can telnet, ftp, ping, etc. to and from that box.  What gives?
> > > >
> > > > Feb 27 16:47:32 ilgc1 network: Shutting down interface eth0 succeeded
> > > > Feb 27 16:47:32 ilgc1 sysctl: net.ipv4.ip_forward = 0
> > > > Feb 27 16:47:32 ilgc1 sysctl: net.ipv4.conf.all.rp_filter = 1
> > > > Feb 27 16:47:32 ilgc1 sysctl: net.ipv4.ip_always_defrag = 0
> > > > Feb 27 16:47:32 ilgc1 sysctl: kernel.sysrq = 0
> > > > Feb 27 16:47:32 ilgc1 network: Setting network parameters succeeded
> > > > Feb 27 16:47:32 ilgc1 ifup: SIOCADDRT: Network is unreachable
> > > > Feb 27 16:47:32 ilgc1 network: Bringing up interface lo succeeded
> > > > Feb 27 16:47:32 ilgc1 network: Bringing up interface eth0 succeeded
> > > >
> > > > Erick Bodine
> > > > Xpedite Systems Inc
> > > > Boulder, CO
> > > >
> > >
> > > Those options (from /etc/sysctl.conf usually) require kernel support to
> > > work. The rp_filter and defrag, so on, look correct. I'd guess your
> > > kernel doesn't support them.
> > >
> > > D. Stimits, stimits at idcomm.com
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