How can I force a network device to always be eth0 (for example)?

I've recently figured out a problem when upgrading from 2.4 kernel to 2.6. It was because the 2.4 kernel detected my (in use) network adapter as eth0 while the 2.6 kernel detected the unused network adapter as eth0 instead.  I had to configure eth1 to get the 2.6 kernel on the network.

1. Was it detected differently because of udev?
2. Can I force a network adapter to always be eth0?

Many thanks,
Steve
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sda100Asked:
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ravenplCommented:
Example from my RH system
file: /etc/udev/rules.d/10-localeth.rules content
KERNEL="eth*",SYSFS{address}="00:e0:81:40:03:da",NAME="eth0"
KERNEL="eth*",SYSFS{address}="00:e0:81:40:03:db",NAME="eth1"
KERNEL="eth*",SYSFS{address}="00:e0:81:40:03:13",NAME="eth2"

Also, You can use ifrename tool http://www.die.net/doc/linux/man/man8/ifrename.8.html
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sda100Author Commented:
Thank you.  I use Gentoo, which is slightly different but you pointed me in the right direction, and I've solved my problem.  Thank you very much.

Steve :)
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