Determining NIC designation from PCI address

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http://unix.stackexchange.com – I am in the process of upgrading a legacy system from RHEL 5.4 to 5.8. There are three NICs installed, each with defined IP addresses and attached wiring. After the upgrade, the cards are on the same PCI addresses but the OS has shuffled the NIC designations: network old new net A eth0 eth1 net B eth1 eth2 net C eth2 eth0 The PCI addresses in use are 05.03.0 for Net C and the other two are on 03.03.0 and 03.03.1. There is no /etc/udev/rules.d/70-persistent-net.rules file. Is there a way to specify which PCI addresses are used for each interface? ()