[ mike in ~ ]$ cat /etc/udev/rules.d/70-persistent-net.rules 
# This file was automatically generated by the /lib/udev/write_net_rules
# program, probably run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.

# PCI device 0x10de:0x0269 (forcedeth)
SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:40:ca:8f:2f:f4", NAME="eth0"

# PCI device 0x1317:0x0985 (tulip)
SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:04:5a:47:1a:58", NAME="eth1_rename"