Re: eth0 hanging at boot
From: P Gentry (rdgentry1_at_cablelynx.com)
Date: 03/11/04
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Date: 11 Mar 2004 12:49:14 -0800
"chloe" <Jon@freeserve.co.uk> wrote in message news:<c2pqhe$klg$1@titan.btinternet.com>...
> My RH9.0 indeed uses dhclient.
>
> My main question is why can I boot successfully with eth0 configuration set
> for "onboot=no", and subsequently I can activate/deactivate eth0 using RH's
> System Tools-Network Device Control application, without any problems
> whatsoever.
> However if I set "onboot=yes", then the boot hangs at activating eth0
> interface.
I misunderstood your last post -- thought after using the gui it was
booting OK. For possible reasons why not see below.
> Presumeably the process of obtaining an IP address from the ADSL router etc
> etc is somehow different depending on whether the activation takes place
> during boot or subsequently after using RH's GUI facility.
Not really different in nature, but different in timing -- the same
script gets called in either case.
> Is there any way of determining just what is being asked for during the
> boot? Presumeably something is being asked for during the boot process eth0
> activation stage, and is not forthcoming, thus the system hangs! Is that
> being too simplistic?
You're on the right track and not being "too simplistic" at all.
[snip]
If your box is _always_ hanging at boot (when "onboot=yes") then some
detective work is needed.
Since you're using a gui, Konsole (in KDE) makes it easy to copy
command line and output for pasting (assume same in Gnome, but I don't
use it any more).
We need output of following commands both before and after bringing up
eth0.
[user]$ /sbin/ifconfig <- interface setup
and
[user]$ /sbin/route -n <- main route table
and
[user]$ /sbin/route -C <- route cache
xDSL is a bit harder to figure out "long distance" because it can be
set up in several ways depending on hardware/provider.
-- do you have "always on" setup so long as the modem is powered up?
-- do you acquire a new "lease" each time the computer powers on?
-- are both your computer and the modem plugged into a power strip
that you use to power up/down your computer?
-- do you know for sure whether you're using PPPoE or PPPoA from the
modem to service provider?
-- should you be running a pppoe client? (doubtful)
-- if the modem provides light indicators, has the modem latched onto
a signal before Linux is loading/initializiing?
These questions are to make sure that there is a way out to the dhcp
server when Linux is booting -- that's what "onboot=yes" requires as
the script will contact the server for configuration info needed to
bring up eth0 properly. When "onboot=no" the script does not run till
you manually activate/bring up eth0.
Also muddying things is the possibilitiy that the modem itself is
acting as the dhcp server.
These multiple setup/configuration possibilities are best covered in
the dsl howto here:
http://www.tldp.org/HOWTO/DSL-HOWTO/
Another question:
When booting with "onboot=yes" does the system actually _hang_ and
refuse to go farther, requiring you to use rescue mode to change to
"onboot=no"? Or is it taking a long time before timing out and
proceeding?
If the first is true, then there is a basic setup problem -- seems
less likely since you can manually bring up eth0. Does the simple
command line work as well as the gui took? At a terminal (as root)
try to bring it up like this:
[root]# ifconfig eth0 up
If the second, the you _may_ be able to work around it, but how to do
so can depend on a number of things. It may be best to check here
first:
http://www.dslreports.com/
and try:
http://www.dslreports.com/forums/all
Since you can bring up your net connection manually, I think it's a
question of getting the script set up and running correctly at boot.
Get back with info above if you need help here.
hth,
prg
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