[K12OSN] Network unreachable.

James P. Kinney III jkinney at localnetsolutions.com
Fri Feb 15 02:42:55 UTC 2008

On Thu, 2008-02-14 at 20:18 -0500, Accessys at smart.net wrote:
> I didn't change anything since It was last working
Something changed that was activated when the system restarted.
> I can ping the router

OK. So networking on the machine _IS_ running. By "ping the router" I'm
assuming you can ping the IP address of the gateway machine/device
(which is found by using the "netstat -rn" command and looking at the
line that starts with as the destination address and the gateway
address will be the second IP address in the line.)

So can you ping other places by name? A good tool to remember is "ping
www.yahoo.com" because they don't close their ping response and it tests
if you have working DNS capability. If that fails, try looking at a web
site with a browser. If you can't do that by name but you know an IP
address site and that works, then DNS is not working. Do you have
correct data in /etc/resolv.conf? Is you Internet facing port working by
static IP or DHCP?
> other than that I wish I knew what you just said????
> I get so frustrated people either talk over my head or down to me

Bugs the total freakin' bejezus out me when people ask for help, don't
send enough info to help with, get their knickers in a twist because
they don't have enough technical background to understand the help they
got and then blame it all on the operating system they don't understand!

Take a deep breath and learn a great thing here: Google is a really good
starting place with error messages. Google _uses_ Linux. Just plop that
error message into a Google search and let the power of a global search
engine help lower your blood pressure.

In short, something horked somewhere and you likely don't have a correct
gateway setting. The following link is Google result #2
> why isn't there any place for someone who isn't a geek but does know a
> fair amount about these machines.  I've complained about this for
> years, only two manuals are written.
> 1 for dummies books
> 2 uber geek.

Get a better bookstore! I have a collection of OReilly books that is
filling a bookcase alone. Plus dozens of other publishers as well.

The indispensable book for Linux noobies (and old farts) is still
"Running Linux" by Matt Welsh (Google it!). It must be on your bookshelf
AND have dogeared pages :) I have my first edition and a second edition.
It's not in it's fifth edition (2006). 

Also get a good book on the specific distro you are using. There isn't
one on K12LTSP but there is a plenty on the Fedora and Redhat base that
K12LTSP5 and 6 and 5EL are based on. Everything you need to know about
generally running the system up to the point where a thin client is
trying to boot up is covered in http://www.redhat.com/docs/manuals/

Will it make your head hurt? Yes. Will it be easy? No. Is it perhaps the
most sophisticated computing platform on the freakin' planet? Yep!

And _you_, and everyone else, can get it for no cash up front
(www.centos.org, www.k12ltsp.org, fedora.redhat.com, www.debian.org,
www.ubuntu.net, etc) and with a world of freedoms that don't prevent you
from learning about the guts of all of it. All you have to do is learn,
think and tinker. Pretty cool, huh?!

> is it any wonder people put up with 2 hours on hold to be told it is
> someeone else's fault.
> I'll get off my soapbox but it is probably the main reason Linux
> doesn't spread.

You can dance naked with flowers in hair on your soap box all you
want :) It won't stop the ongoing spread of Linux . Just ask on this
list how many school kids see Linux every day at school. Ask any
uber-geek at a bank back room IT facility when the boss isn't around
about how many machines run Linux. Ask Wall Street if Linux is
expanding. Ask the New York Stock Exchange. 

Call Microsoft ab out a problem with your Vista machine and see how long
you wait for answer.
> Bob
> On Thu, 14 Feb 2008, Les Mikesell wrote:
> > Accessys at smart.net wrote:
> > > had to shut my system down yesterday and when I rebooted everything
> > > was working fine except accessing the network.
> > >
> > > keep getting the error code
> > >
> > > SIOCADDRT: network is unreachable
> > >
> > > I can ping my cards and the blinking lights on the router appear to be
> > > correct. so what is this' I thought I had seen every error code
> > > possible but then another.  it really has me stumped, tried I think
> > > all the standard fixes and am getting nowhere fast.
> >
> > If your /etc/sysconfig/network-scripts/ifcfg-eth? files don't have the
> > right HWADDR to match your NIC cards (for example if you cloned a disk
> > from a different machine or swapped cards after setup), the system can
> > detect them in the wrong order and even use interfaces you had not set
> > up.   The 'mii-tool' command will show which interfaces have link active
> > . If you can't ping your router, try checking one cable at at time to
> > make sure you have link on the right interface name and that ifconfig
> > shows that it has the expected IP address.
> >
> > --
> >    Les Mikesell
> >      lesmikesell at gmail.com
> >
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> >
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James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC        

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7

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