Re: IP_Alias and SysVInit

ATPlack (
Tue, 1 Oct 1996 10:53:31 -0500

Sorry but my install of the rembrandt changed this from to ifup-eth* which
does the same thing and more.

If this were not working ( and it is), the ifup-eth0:0 would not work at all
and I would not get the delay message.

The problem is not that the script is being recognized. It is that the ifup
file checks the interface via the ifconfig eth0:0. Since this function
indicates that the device is unavailable, it cancels the running of the

Michael Johnson at RedHat seems to think that he has a change in the
Initscript that will correct this.

Thanks for the help though.
Subject: Re: IP_Alias and SysVInit
Date: Monday, September 30, 1996 6:23PM

> Okay I am trying to setup an alias for my eth0 interface. I am using
> SysVInit on a Rembrandt Installation (Same thing on Slackware install so
> it is not this version).
> I have the rc3.d/S10network file runing the ifup in the
> /etc/sysconfig/network-scripts directory.
> Inside this directory I have the ifcfg-eth0 file and I also have create
> a ifcfg-eth0:0 file with the correct settings.

seems OK

> This all seems to "run" correctly. from the init script except that the
> alias is being "Delayed".
> I traced the problem to the following line:
> /sbin/ifconfig ${DEVICE} 2>&1 | grep -s "unknown interface" > /dev/null
> if I run this line, step by step, I find out that the "/sbin/ifconfig
> eth0:0 2>&1" or "/sbin/ifconfig eth0:0" comes back with the following
> error:
> eth0:0::unknown interface
> The following line DOES work:
> /sbin/ifconfig eth0:0
> I am running ifconfig version 1.20 (Rembrandt) or ifconfig version 1.22
> (Slackware)
> Questions
> 1. Is this the correct place to put IP aliases for boot time loading?

You have as far as I know done absolutly the correct thing in creating
the file /etc/sysconfig/network-scripts/ifcfg-eth0:0, the problem is
that the /etc/rc.d/init.d/network that comes with RedHat doesn't check
for these files, below is a untested patch that should fix it ("cd
/etc/rc.d/init.d; patch file_where_patch_is")

This is from RedHat 3.0.3 so it might have changed but you get the

--- network.orig Tue Oct 1 01:29:05 1996
+++ network Tue Oct 1 01:29:56 1996
@@ -30,7 +30,7 @@
if [ "${PCMCIA}" = "yes" ]; then
echo "Delaying eth initialization for pcmcia card manager"
- for i in ifcfg-eth?; do
+ for i in ifcfg-eth? ifcfg-eth?:? ; do
if [ -e $i ]; then
./ifup-eth $i boot

> 2. Why does ifconfig not see that alias interface like this? Is there a
> patch for this?

ifconfig does se it but the network script doesn't

> 3. Is the problem in the init scripts or in ifconfig?

init scripts...

> 4. What does "2>&1" do? I cannot find it anywhere.

it redirects the stderr of the process to stdout (this is a bash
feature, "man bash" might tell you)


Hope this helps...

Johnny Stenback, programmer / University of Vaasa, Computer Centre
E-Mail, Phone +358 61 3248 387, +358 50 5575 094