Re: New network device causes 'jump' from eth0 to eth1

[Oron Peled]

Since people pointed to distribution specific files, let's
consolidate the knowledge:
 * Renaming interfaces used to be done by the nameif(8) command.
 * Although this command is still carried by modern distributions
   (e.g: my Fedora-8 and Fedora-9) its usage was deprecated in favor
   of the modern ip(8) command.
 * To rename an interface:
/sbin/ip link set  name 

As is common in Unix/Linux systems, there are scripts that run these
commands for us (e.g: during boot), and these scripts read their
configuration information from other files.

The relevant script in Fedora/Centos/Red Hat is
  /etc/sysconfig/network-scripts/ifup-eth
and it calls the shell function rename_device defined
in /etc/sysconfig/network-scripts/network-functions.

Ehud Karni correctly pointed that these scripts read from:
> On Fedora/Centos the file /etc/sysconfig/network-scripts/ifcfg-eth
> can have the line:   HWADDR=xx:xx:xx:xx:xx:xx  (mac address)
> to assign the eth to specific network card.

As pointed by others, Debian has different scripts which read
the configuration in interfaces(5).

Yet, other distributions have their own scripts/configs. However
if we search for the nameif(8) or ip(8) commands in the right
directories (under /etc of course) we would find the correct
scripts to configure and from there the config files they use.

And we haven't talked about NetworkManager yet...

Cheers,

-- 
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 In practice, there is."
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Re: New network device causes 'jump' from eth0 to eth1

[Ehud Karni]

On Thu, 3 Jul 2008 16:41:20 Baruch Siach wrote:
>
> On Thu, Jul 03, 2008 at 04:27:29PM +0300, Noam Rathaus wrote:
> > Hi,
> > Or basically, where is it written that eth0 is 'thismodule' while eth1 is
> > 'thisothermodule'?
>
> udev takes care of this. On Debian machines the relevant configuration file is
> /etc/udev/rules.d/z25_persistent-net.rules. I guess there is something similar
> for other distributions.

On Fedora/Centos the file /etc/sysconfig/network-scripts/ifcfg-eth
can have the line:   HWADDR=xx:xx:xx:xx:xx:xx  (mac address)
to assign the eth to specific network card.

Ehud.


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Re: New network device causes 'jump' from eth0 to eth1

[Baruch Siach]

Hi Noam,

On Thu, Jul 03, 2008 at 04:27:29PM +0300, Noam Rathaus wrote:
> Hi,
> Or basically, where is it written that eth0 is 'thismodule' while eth1 is 
> 'thisothermodule'?

udev takes care of this. On Debian machines the relevant configuration file is 
/etc/udev/rules.d/z25_persistent-net.rules. I guess there is something similar 
for other distributions.

baruch

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Re: New network device causes 'jump' from eth0 to eth1

[Omer Zak]

--=-norL4QRk5t43W51udD8G
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

The relevant file is /etc/network/interfaces - see man 5 interfaces.


On Thu, 2008-07-03 at 16:27 +0300, Noam Rathaus wrote:
> Hi,
> 
> I moved an HD from one computer to another (not related to the grub issue 
> :D), 
> and because there is a different network card, eth0 is not longer present and 
> now eth1 is the deacto network card.
> 
> I don't want to reconfigure a few products I have bounded to eth0 (mainly 
> firewall rules).
> 
> How can I "force" it to use the new network card driver on eth0 instead of 
> eth1?
> 
> Or basically, where is it written that eth0 is 'thismodule' while eth1 
> is 'thisothermodule'?
> 
> I tried modprobe.conf/modules.conf:
> alias eth0 e1000e
> 
> Without success - it still - after modprobe e1000e - gives me access to it 
> only through eth1
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--=-norL4QRk5t43W51udD8G
Content-Disposition: attachment; filename=check-mac-address.sh
Content-Type: application/x-shellscript; name=check-mac-address.sh
Content-Transfer-Encoding: 7bit

#!/bin/sh
# Checks if the given interface matches the given ethernet MAC
# if it does it exits with 0 status, if it doesn't then it exists
# with 1 (error) status.

set -e

export LANG=C

if [ ! -n "$1" -o ! -n "$2" ] ; then
echo "Usage: $0 IFACE targetMAC"
exit 1
fi
iface="$1"
targetmac=`echo "$2" | sed -e 'y/ABCDEF/abcdef/'`
mac=$(/sbin/ifconfig "$iface" | sed -n -e '/^.*HWaddr 
\([:[:xdigit:]]*\).*/{s//\1/;y/ABCDEF/abcdef/;p;q;}')

if [ "$targetmac" = "$mac" ]; then exit 0; else exit 1; fi

--=-norL4QRk5t43W51udD8G--


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Re: New network device causes 'jump' from eth0 to eth1

[Shachar Shemesh]

Noam Rathaus wrote:

Hi,

I moved an HD from one computer to another (not related to the grub issue :D), 
and because there is a different network card, eth0 is not longer present and 
now eth1 is the deacto network card.


I don't want to reconfigure a few products I have bounded to eth0 (mainly 
firewall rules).


How can I "force" it to use the new network card driver on eth0 instead of 
eth1?


Or basically, where is it written that eth0 is 'thismodule' while eth1 
is 'thisothermodule'?


I tried modprobe.conf/modules.conf:
alias eth0 e1000e

Without success - it still - after modprobe e1000e - gives me access to it 
only through eth1



  
On Debian systems, check out /etc/udev/rules.d/z25-persistent-network. 
Just delete the lines for the old and the new network card, and let it 
choose automatically eth0.


Shachar

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New network device causes 'jump' from eth0 to eth1

[Noam Rathaus]

Hi,

I moved an HD from one computer to another (not related to the grub issue :D), 
and because there is a different network card, eth0 is not longer present and 
now eth1 is the deacto network card.

I don't want to reconfigure a few products I have bounded to eth0 (mainly 
firewall rules).

How can I "force" it to use the new network card driver on eth0 instead of 
eth1?

Or basically, where is it written that eth0 is 'thismodule' while eth1 
is 'thisothermodule'?

I tried modprobe.conf/modules.conf:
alias eth0 e1000e

Without success - it still - after modprobe e1000e - gives me access to it 
only through eth1


-- 
Noam Rathaus
CTO
[EMAIL PROTECTED]
http://www.beyondsecurity.com

"Know that you are safe."

Beyond Security Finalist for the "Red Herring 100 Global" Awards 2007

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